{"id":"11542","text":"Why is gravitation force always attractive?"}
{"id":"89378","text":"de Broglie relations: calculate wavelength using two different approaches"}
{"id":"271","text":"Why don't spinning tops fall over?"}
{"id":"16708","text":"Why does it seem like a broken magnet's poles flip?"}
{"id":"12012","text":"Is spacetime simply connected?"}
{"id":"17259","text":"How fast does force propagate through matter?"}
{"id":"46798","text":"The meaning of imaginary time"}
{"id":"46863","text":"Why is a cycloid path the fastest way to roll a ball downward?"}
{"id":"134809","text":"Projectile with air resistance"}
{"id":"111546","text":"Can I measure a journey time < 100 years on a 100 light year voyage?"}
{"id":"391","text":"Is anti-matter matter going backwards in time?"}
{"id":"102941","text":"How many physical degrees of freedom does the $\\mathrm{SU(N)}$ Yang-Mills theory have?"}
{"id":"60016","text":"exercise books for Feynman diagrams"}
{"id":"102363","text":"General relativity, gravity and spacetime curvature"}
{"id":"109850","text":"Was the mass of the universe the same when it first began as it is now?"}
{"id":"10252","text":"Why is travelling around the speed of light a problem?"}
{"id":"63023","text":"I read a book saying bernoulli's flight equations didn't have as much impact on lift as most people think"}
{"id":"24588","text":"Why don't we see solar and lunar eclipses often?"}
{"id":"71772","text":"How can we deduce the relation $m = \\frac{m_0}{\\sqrt{1-\\frac{v^2}{c^2}}}$ between relativistic mass and rest mass in special relativity?"}
{"id":"12589","text":"Are there formulae for calculating stellar luminosity and effective temperature as a function of age?"}
{"id":"81561","text":"Why can we skate on ice?"}
{"id":"9194","text":"What is the Physical Meaning of Commutation of Two Operators?"}
{"id":"112866","text":"If I'm floating in space and I turn on a flashlight, will I accelerate?"}
{"id":"90128","text":"String Theory- Are strings the end? What are they made of?"}
{"id":"29355","text":"Reading the Feynman lectures in 2012"}
{"id":"109364","text":"Can 'Backradiation' warm its own source?"}
{"id":"67571","text":"Is time slowing down and disappearing from the universe instead of the expansion of universe?"}
{"id":"129378","text":"The universe could have created itself?"}
{"id":"103931","text":"Does light color change when refracting?"}
{"id":"109636","text":"Why are people weightless whilst in orbit around the Earth? ISS? Satellites?"}
{"id":"12463","text":"Einstein's postulates <==> Minkowski space. In layman's terms"}
{"id":"112476","text":"Water Displacement in the Oceans As a result of Global Warming"}
{"id":"19262","text":"What's the standard \"roadmap\" to learning quantum physics?"}
{"id":"82821","text":"current in wire + special relativity = magnetism"}
{"id":"94132","text":"Geodesic for Electromagnetic forces"}
{"id":"102517","text":"Are continuous mathematical models of discrete physical phenomena messy because of a disconnect between “continuous” and “discontinuous”?"}
{"id":"80467","text":"Why does time reversibility imply equilibrium in a thermodynamic system?"}
{"id":"92571","text":"Would Beetee's electrocution plan work and kill the tributes in the lake?"}
{"id":"1442","text":"If time standard clocks and any memories about the time standard are destroyed, can we recover the time standard again?"}
{"id":"198","text":"Do current models of particle physics explain the chemical properties of elements\/compounds?"}
{"id":"70541","text":"Canonical everyday-life example of a technology that could not work without humans mastering QM in analogy to the application of GR in GPS?"}
{"id":"14142","text":"Maximum limit on the number of paper-folds possible after tearing into halves"}
{"id":"18670","text":"ALL \"forces\" as manifestations of properties of space-time"}
{"id":"44718","text":"Elastic Collision Between Two Objects"}
{"id":"134157","text":"Can mass be totally converted into energy?"}
{"id":"11878","text":"A No-Nonsense Introduction to Quantum Field Theory"}
{"id":"1683","text":"Mechanics around a rail tank wagon"}
{"id":"118717","text":"Newton and the change of mass with time"}
{"id":"102366","text":"gravitational lensing"}
{"id":"116842","text":"What would happen if I was in the centre of the Earth?"}
{"id":"61948","text":"Did space and time exist before the Big Bang?"}
{"id":"69726","text":"Does trade affect Earth's rotation?"}
{"id":"21319","text":"How can anything ever fall into a black hole as seen from an outside observer?"}
{"id":"56973","text":"Why does the speed of light $c$ have the value it does?"}
{"id":"62637","text":"The potential and the intensity of the gravitational field in the axis of a circular plate"}
{"id":"133093","text":"What formula connects the moment of inertia and angular velocity?"}
{"id":"133096","text":"Expanding universe and the speed of light"}
{"id":"47941","text":"Dumbed-down explanation how scientists know the number of atoms in the universe?"}
{"id":"12756","text":"A flying fly inside a sealed box on a scale"}
{"id":"21487","text":"Train crash: are these situations alike?"}
{"id":"44509","text":"Photon energy - momentum in matter"}
{"id":"1343","text":"Why does dust stick to rotating fan propeller?"}
{"id":"8379","text":"Do Hydrinos Exist?"}
{"id":"98027","text":"What is the universe 'expanding' into?"}
{"id":"116657","text":"Force applied on the ground"}
{"id":"52062","text":"Is it possible to speed up radioactive decay rates?"}
{"id":"24841","text":"Geocentric Model in General Relativity"}
{"id":"113973","text":"Is it possible to create matter?"}
{"id":"35313","text":"How does a treadmill incline mechanism work?"}
{"id":"87829","text":"How Can There Be Magnetic Force Without Velocity"}
{"id":"92747","text":"How can a proton be converted to a neutron via positron emission and yet gain mass?"}
{"id":"18602","text":"What exactly is the 'observer' in physics and\/or quantum mechanics?"}
{"id":"81779","text":"how does an electric field comes inside a conducting wire inside the circuit?"}
{"id":"21721","text":"What is the proof that the universal constants ($G$, $\\hbar$, $\\ldots$) are really constant in time and space?"}
{"id":"49940","text":"What exists in the Space between atoms"}
{"id":"2860","text":"How does electron move around nucleus?"}
{"id":"68898","text":"Is it possible to generate usable electricity from the motion or magnetic field of the Earth?"}
{"id":"24231","text":"When Physicists thought neutrinos were faster than the speed of light"}
{"id":"67746","text":"Why two balls of different mass dropped from the same height falls the ground at the same time?"}
{"id":"126264","text":"On becoming theoretical physicist"}
{"id":"51295","text":"Different perspective in Quantum mechanics"}
{"id":"60830","text":"Why isn't temperature measured in Joules?"}
{"id":"2056","text":"Why is it that using cell phone can invite lighting strike?"}
{"id":"134979","text":"Does gravity weaken by the square of the distance because the energy is dispersed over the square of the distance"}
{"id":"107671","text":"If 'pure energy' is photons, and energy is conserved, how can matter and antimatter (electrons and positrons) annihilate into photons and vice-versa?"}
{"id":"39344","text":"Helpful tutorials on force"}
{"id":"108214","text":"Applications of low-dimensional topology to physics"}
{"id":"86345","text":"Intuitive understanding of centripetal vs. centrifugal force"}
{"id":"119284","text":"Experimental proof of the principle of superposition in QM"}
{"id":"6682","text":"Software for geometrical optics"}
{"id":"10161","text":"Is there a good chance that gravitational waves will be detected in the next years?"}
{"id":"94819","text":"Because position is relative, is it possible to see a star orbiting a planet?"}
{"id":"29901","text":"How is traveling back in time possible in theory according to some scientists?"}
{"id":"43023","text":"Why does the moon look bigger at the horizon?"}
{"id":"90908","text":"Could Dark Matter form black hole?"}
{"id":"127538","text":"Are there any applications of elementary number theory to science?"}
{"id":"73114","text":"Space expanding, or light slowing down?"}
{"id":"46933","text":"What's the most efficient way to study physics?"}
{"id":"75876","text":"Effects of magnetic fields on our bodies"}
{"id":"32122","text":"Phase shift of 180 degrees on reflection from optically denser medium"}
{"id":"98000","text":"Does the time for communication between moving objects solely account for each object to perceive the other object's clock to more slowly tick?"}
{"id":"3795","text":"Why are snowflakes symmetrical?"}
{"id":"86528","text":"How functions become operators in quantum mechanics?"}
{"id":"106065","text":"Relativity's effects on centripetal motion"}
{"id":"72983","text":"Optics of a rotated spectacle lens"}
{"id":"132058","text":"Speed greater than light in circular motion"}
{"id":"6533","text":"What allows the modified Urca process to work at lower density than direct Urca in neutron star cooling?"}
{"id":"18473","text":"Where do electrons get their ever-lasting circulating energy?"}
{"id":"131505","text":"Universal speed limit"}
{"id":"82599","text":"quantum mechanics and canonical conjugate"}
{"id":"16305","text":"If Earth Were Filled with a Compressible Fluid and Spun Really Fast, What Hollow Would Form?"}
{"id":"63424","text":"Energy needed to raise energy level of an atom?"}
{"id":"90715","text":"How do gravitons and curved space time work together?"}
{"id":"109332","text":"Calculate analytically the time until two spheres meet due to gravitation"}
{"id":"59438","text":"How do you calculate power at the focal point of a mirror?"}
{"id":"55190","text":"Flushing water-Is it related to Coriolis force?"}
{"id":"61455","text":"How can a single slit diffraction produce an interference pattern?"}
{"id":"93530","text":"Why is pressure always non directional?"}
{"id":"104144","text":"Why is the camera not the culprit?"}
{"id":"74087","text":"Resource for nonphysicists about QM\/GR incompatibility"}
{"id":"74333","text":"Can the laws of classical mechanics be derived from quantum mechanics?"}
{"id":"105239","text":"How does a black hole slow time?"}
{"id":"37702","text":"How do you change Planck's law from frequency to wavelength?"}
{"id":"41424","text":"What does \"the ${\\bf N}$ of a group\" mean?"}
{"id":"33822","text":"Variational Calculus or Tensor Calculus?"}
{"id":"47136","text":"Cubic symmetry and a stiffness tensor"}
{"id":"1915","text":"What does it mean that the universe is \"infinite\"?"}
{"id":"885","text":"Why does calculus of variations work?"}
{"id":"122413","text":"Help explain how direction change relates to acceleration"}
{"id":"129030","text":"Is gravitational acceleration less affected by relativistic mass increase?"}
{"id":"8784","text":"\"Troll physics\": Buoyancy for infinite power"}
{"id":"66476","text":"What is the Earth truly rotating about\/revolving around?"}
{"id":"22566","text":"Question Based On Units And Measurements Involving Lengths"}
{"id":"104301","text":"Gravity propagation speed"}
{"id":"117223","text":"Photon speed going from $0$ to $c$ initially?"}
{"id":"107546","text":"Why doesn't our body gets crushed due to the atmospheric pressure?"}
{"id":"113830","text":"Two explanations of non-zero atomic radius"}
{"id":"9049","text":"Why doesn't the Moon fall upon Earth?"}
{"id":"78095","text":"As the earth rotates around itself, does this have any effect on the dynamics of flights?"}
{"id":"9045","text":"Why do they store gold bars with the narrow side down?"}
{"id":"68233","text":"Electricity directly from heating a material"}
{"id":"103670","text":"Do black holes exist?"}
{"id":"92051","text":"How can momentum but not energy be conserved in an inelastic collision?"}
{"id":"22046","text":"Books for Condensed Matter Physics"}
{"id":"133707","text":"How can you calculate how fast a spinning ring\/cylinder will accelerate a mass via gravitomagnetism?"}
{"id":"10130","text":"Physics breakthroughs in the last two decades"}
{"id":"103448","text":"Red color has largest wavelenght and violet minimum (in the range of visible light). then why does violet light appears reddish? RED + BLUE = VIOLET"}
{"id":"73813","text":"Wave theory limit of geometric optics?"}
{"id":"38313","text":"What's the difference between electron movement and charge movement in electricity?"}
{"id":"100056","text":"Why do electrons and protons attract each other?"}
{"id":"48196","text":"Good Books on Gauge Theory"}
{"id":"66538","text":"Time dilation at a black hole"}
{"id":"27641","text":"Entanglement in time"}
{"id":"52845","text":"Nuclear structure"}
{"id":"130676","text":"What do we mean by electromagnetic charge?"}
{"id":"135007","text":"Constants of infinity"}
{"id":"116281","text":"Dark Energy \/ Accelerating universe: naive question"}
{"id":"45108","text":"Half-Life Question"}
{"id":"126619","text":"Why do we say that light travels at a speed?"}
{"id":"12557","text":"Is apparent horizon curvature lesser due to refraction of light in the atmosphere?"}
{"id":"5851","text":"When lasers are used to cool atoms or ions, etc where does the heat go?"}
{"id":"52391","text":"Is the Pauli exclusion principle as Brian Cox described it?"}
{"id":"17034","text":"How can we be sure that nature isn't \"faking\" quantum statistics?"}
{"id":"53519","text":"Physics textbook for mathematicians"}
{"id":"3521","text":"Has the black hole information loss paradox been settled?"}
{"id":"70651","text":"Why is the Ampere a base unit and not the Coulomb?"}
{"id":"102760","text":"Man on a rope task"}
{"id":"133829","text":"Doppler Shift when Light Travels Through Two Different Mediums"}
{"id":"52487","text":"Photometer: measured Irradiance L converted to photon rate"}
{"id":"122941","text":"Why must a singularity form inside a black hole?"}
{"id":"6197","text":"Do two beams of light attract each other in general theory of relativity?"}
{"id":"48548","text":"Apparent paradox in equation of continuity"}
{"id":"59635","text":"Magnifying Glass-How does it work?"}
{"id":"8709","text":"Does mass affect speed of orbit at a certain distance?"}
{"id":"60476","text":"Exact Solutions to the Navier-Stokes Equations"}
{"id":"113527","text":"Is the Lorentz force conservative?"}
{"id":"25883","text":"Why is there still radiation left from the Big Bang now?"}
{"id":"34500","text":"How can black holes have gravity?"}
{"id":"66220","text":"Proof of Spin-statistics theorem"}
{"id":"105183","text":"Question about two masses connected by a spring"}
{"id":"4617","text":"Why two objects get charged by rubbing?"}
{"id":"23930","text":"What happens to the energy when waves perfectly cancel each other?"}
{"id":"88077","text":"Is the Higgs particle the final one predicted by the Standard Model?"}
{"id":"25378","text":"How vacuous is intergalactic space?"}
{"id":"16415","text":"Conveyor scales modeling"}
{"id":"101150","text":"Ascertain the height an object has fallen from given force exerted and mass"}
{"id":"70147","text":"Why do cosmic bodies revolve?"}
{"id":"131352","text":"Why does a motor draw more current stopped or under load?"}
{"id":"86597","text":"QFT as a rigorous mathematical theory"}
{"id":"14760","text":"What is the variable plotted on the y-axis on these Higgs exclusion graphs?"}
{"id":"9122","text":"What is the difference between implicit and explicit time dependence e.g. $\\frac{\\partial \\rho}{\\partial t}$ and $\\frac{d \\rho} {dt}$?"}
{"id":"57317","text":"Multiple measurements of the same quantity - combining uncertainties"}
{"id":"20303","text":"Negative chemical potential"}
{"id":"1317","text":"Which is easier, pushing or pulling?"}
{"id":"27078","text":"Choice and identification of vacuums in AdS\/CFT"}
{"id":"26307","text":"The collision of Phobos"}
{"id":"75352","text":"Atoms: boson or fermion?"}
{"id":"11188","text":"Can a particle be *physically* observed inside a quantum barrier?"}
{"id":"41494","text":"Physical meaning of force times area"}
{"id":"28929","text":"How to find orbital radius of star in a binary system using redshift and orbital period data?"}
{"id":"944","text":"Noticing that Newtonian gravity and electrostatics are equivalent, is there also a relationship between the general relativity and electrodynamics?"}
{"id":"90034","text":"How are the definitions of a coherent state equivalent?"}
{"id":"29200","text":"What experiments prove the greenhouse effect?"}
{"id":"2066","text":"Why does adding solutes to pure water lower the the specific heat?"}
{"id":"15640","text":"What are \"electron holes\" in semiconductors?"}
{"id":"46743","text":"Are galactic stars spiraling inwards?"}
{"id":"123803","text":"Different factors of $4\\pi$ and $\\epsilon_0$ in Poisson equation"}
{"id":"29956","text":"Book covering Topology required for physics and applications"}
{"id":"14255","text":"Experimental evidence for parallel universes"}
{"id":"19370","text":"What would an observer see if he\/she flew toward a clock at relativistic speeds?"}
{"id":"69778","text":"Accelerating electrons via microwaves"}
{"id":"116230","text":"Why fundamentally does classical mechanics lead to second order dynamics?"}
{"id":"68911","text":"Why do current and electrons flow in opposite directions?"}
{"id":"61699","text":"Why are alpha particles such a prominent form of radiation and not other types of nucleon arrangement?"}
{"id":"77373","text":"Proof of conservation of energy?"}
{"id":"401","text":"What software programs are used to draw physics diagrams, and what are their relative merits?"}
{"id":"542","text":"Chance of objects going against greater entropy?"}
{"id":"95411","text":"Photoelectric Effect, Why can't two quanta interact with an electron at the same time?"}
{"id":"39161","text":"What happens to an embedded magnetic field when a black hole is formed from rotating charged dust?"}
{"id":"128702","text":"Woodwind instruments overtones"}
{"id":"48435","text":"Quick introduction to electromagnetism \/ Maxwell's equations"}
{"id":"95361","text":"Can we calculate the frame dragging force of the Earth?"}
{"id":"113982","text":"Why $\\vec F=m\\vec a$ instead of $\\vec F=m\\vec v$?"}
{"id":"78741","text":"What state is fire? Solid, Liquid or Gas or Plasma?"}
{"id":"38963","text":"Study Quantum Physics"}
{"id":"31827","text":"How does Annihilation work?"}
{"id":"101291","text":"Density operators in a Hilbert Space"}
{"id":"4506","text":"Homework about spinning top"}
{"id":"16596","text":"About the Ether Theory acceptance"}
{"id":"53168","text":"Does photon have size measurement because of its particle nature"}
{"id":"9371","text":"Why would Antimatter behave differently via Gravity?"}
{"id":"13220","text":"Physics needed to build a top down billiards game"}
{"id":"129593","text":"minimum possible absolute temperature in the universe?"}
{"id":"67188","text":"What is the \"Event Horizon\" of a black hole"}
{"id":"101649","text":"What is the physical significane of Complex Time Evolution in EM Waves?"}
{"id":"6384","text":"Why does dilation invariance often imply proper conformal invariance?"}
{"id":"126769","text":"Which Optics textbooks are good?"}
{"id":"126766","text":"What point of application of force ensures more acceleration in a rod?"}
{"id":"2974","text":"If the earth left the solar system for interstellar space. How long would it take for atmosphere to freeze"}
{"id":"129715","text":"Quantum Mechanics and Direction of time"}
{"id":"123267","text":"Is there an upper limit to a rocket's size\/payload?"}
{"id":"76100","text":"Disk spinning at the speed of light"}
{"id":"133564","text":"Why photon has a wave nature?"}
{"id":"87140","text":"In an absence of gravity, does time flow faster or slower than on Earth?"}
{"id":"1888","text":"Balloons and lifting gases"}
{"id":"77525","text":"Is spacetime all that exists?"}
{"id":"51711","text":"Why shouldn't the uncertainty principle be interpreted as an observer effect?"}
{"id":"104196","text":"The sound when boiling water"}
{"id":"29794","text":"Why are coordinates and velocities sufficient to completely determine the state and determine the subsequent motion of a mechanical system?"}
{"id":"15263","text":"Neutrino unaffected by gravity"}
{"id":"43406","text":"What constitutes an observation\/measurement in QM?"}
{"id":"13557","text":"History of interpretation of Newton's first law"}
{"id":"87686","text":"Will the moon really escape the Earth?"}
{"id":"46639","text":"Non-Degeneracy of Eigenvalues of Number Operator for Simple Harmonic Oscillator"}
{"id":"7276","text":"What combinations of realism, non-locality, and contextuality are ruled out in quantum theory?"}
{"id":"54437","text":"Learning more about String theory"}
{"id":"90646","text":"What is the relation between electromagnetic wave and photon?"}
{"id":"2684","text":"How do I calculate the (apparent) gravitational pull with General Relativity?"}
{"id":"71823","text":"Is there a proof of existence of time?"}
{"id":"68289","text":"Is there anything smaller than a quark?"}
{"id":"104019","text":"Special Relativity Textbooks Request"}
{"id":"87376","text":"Good and simple reference for studying about ADM mass"}
{"id":"16725","text":"Intuitively, what is the source term of the Einstein field equation?"}
{"id":"14865","text":"What do physicists mean when they say \"speed of light\"?"}
{"id":"92245","text":"Electromagnet emitting light"}
{"id":"61031","text":"If photons can be absorbed by electrons, wouldn't that mean light has a charge?"}
{"id":"52837","text":"When do I apply Significant figures in physics calculations?"}
{"id":"2721","text":"What is the symmetry which is responsible for preservation\/conservation of electrical charges?"}
{"id":"37981","text":"Is there a way to save electricity from lightning?"}
{"id":"19816","text":"What is the meaning of speed of light $c$ in $E=mc^2$?"}
{"id":"66044","text":"Why is light produced when an underwater bubble is collapsed with a sound wave?"}
{"id":"130686","text":"Why magnetic field generates around current carrying wire?"}
{"id":"28895","text":"Why is the sky not purple?"}
{"id":"16020","text":"Air flow coming out of a fan feels much stronger than air flow coming in. Why?"}
{"id":"121911","text":"How to find equation of motion for this trajectory? - object leaves curved ramp at a given velocity"}
{"id":"118988","text":"If lead's electron configuration ends with 6p$^2$, shouldn't it be paramagnetic?"}
{"id":"129350","text":"Does the order of variables matter for a quantum Lagrangian in the path integral formula for quantum mechanics?"}
{"id":"27847","text":"Why is there a $\\frac 1 2$ in $\\frac 1 2 mv^2$?"}
{"id":"12169","text":"Detection of the Electric Charge of a Black Hole"}
{"id":"87880","text":"Isn't Dark Matter just an Indication that Relativity breaks down when describing large masses?"}
{"id":"130767","text":"Beginner question: timelessness of massless particles"}
{"id":"17944","text":"How does the Higgs mechanism work?"}
{"id":"14362","text":"Help Me Gain an Intuitive Understanding of Lorentz Contraction"}
{"id":"110736","text":"About the speed of light and gravity"}
{"id":"22803","text":"Is acceleration relative?"}
{"id":"72788","text":"Uncertainty and wave-trains"}
{"id":"60899","text":"The paradoxical nature of Hawking radiation"}
{"id":"63811","text":"Is the universe fundamentally deterministic?"}
{"id":"36167","text":"Does juggling balls reduce the total weight of the juggler and balls?"}
{"id":"127940","text":"Jump from a falling object"}
{"id":"13349","text":"Online lecture videos on QCD?"}
{"id":"44193","text":"What would happen to a person that was inside the Large Hadron Collider when it is turned on?"}
{"id":"80932","text":"Are free electrons in a metal really free"}
{"id":"335","text":"Is electricity instantaneous?"}
{"id":"96562","text":"interaction of mathematical structures (rephrased)"}
{"id":"9449","text":"Video lectures on graduate level Classical Electrodynamics"}
{"id":"113749","text":"Is there experimental evidence that massless particles such as photons attract massive objects?"}
{"id":"68940","text":"Virtual photons, what makes them virtual?"}
{"id":"78500","text":"Linearized equations"}
{"id":"77741","text":"Why don't photons crash into each other occasionally? Or do they?"}
{"id":"83070","text":"What's the shear rate in a turbulent flow?"}
{"id":"38246","text":"Formulas for compressibility of solids (physics)"}
{"id":"31326","text":"Is a hard drive heavier when it is full?"}
{"id":"52008","text":"Does light accelerate or slow down during reflection?"}
{"id":"25110","text":"Why are orbits elliptical?"}
{"id":"57181","text":"What are the potential technological advances that the discovery of the Higgs boson may unlock?"}
{"id":"53356","text":"Reference on Chern-Simons theory"}
{"id":"3833","text":"Age of the Earth and the star that preceded the Sun"}
{"id":"6147","text":"Time Dilation - How does it know which Frame of Reference to age slower?"}
{"id":"69679","text":"Can solar furnace achieve higher temperature than sun surface?"}
{"id":"69350","text":"Drag force at high speeds"}
{"id":"68757","text":"Why do neutrinos propagate in a mass eigenstate?"}
{"id":"44351","text":"Why are we not using thorium for energy?"}
{"id":"35139","text":"What is the possibility of a railgun assisted orbital launch?"}
{"id":"13851","text":"Can you split a photon?"}
{"id":"25637","text":"How to correct flares and sharply focus on my telescope when viewing planets."}
{"id":"107614","text":"Why \"Dark Energy\" is called energy instead of force?"}
{"id":"132449","text":"Why do we fall down when the bicycle slows down?"}
{"id":"135145","text":"Change in momentum"}
{"id":"70200","text":"Why electrons can't radiate in their atoms' orbits?"}
{"id":"120191","text":"How much wind does it take to tip a sign over?"}
{"id":"122841","text":"Leg Press & Actual Lifted Weight"}
{"id":"24359","text":"Why do objects follow geodesics in spacetime?"}
{"id":"61643","text":"Does more rain strike a vehicle while moving or while stopped (or neither)?"}
{"id":"98714","text":"How are symmetries precisely defined?"}
{"id":"70439","text":"How occurs the enantiomorph of the mirror?"}
{"id":"1051","text":"conversion of information to energy"}
{"id":"62711","text":"What happens to things when things get crushed in a blackhole"}
{"id":"661","text":"Is it possible to blur an image in such way that a person with sight problems could see it sharp?"}
{"id":"91797","text":"Why would an electron in an orbit be accelerating continuously and would thus radiate away its energy and fall into the nucleus in a classical model?"}
{"id":"27326","text":"Uniqueness of eigenvector representation in a complete set of compatible observables"}
{"id":"119935","text":"Maximum helicopter height"}
{"id":"58122","text":"Why work to change velocity from 0 to 20 km\/h is less then from 20 to 40?"}
{"id":"107561","text":"Dependence of Force as a function of Distance?"}
{"id":"83101","text":"Expansion of a function"}
{"id":"9708","text":"Is fire matter or energy?"}
{"id":"111530","text":"Would atmosphere of Jupiter blow up if I launched a atomic bomb there?"}
{"id":"114887","text":"Hubble time and its derivation?"}
{"id":"87976","text":"Direction of friction when a car turns"}
{"id":"71292","text":"Why does a cork float to the side of a glass?"}
{"id":"99535","text":"how does the temperature of a gas increase when compressed by an external agent during sound production?"}
{"id":"24540","text":"Why do Calabi-Yau manifolds crop up in string theory, and what their most useful and suggestive form?"}
{"id":"74020","text":"Why did the Earth cool down?"}
{"id":"134127","text":"The Equivalence Principle approaching the speed of light"}
{"id":"94901","text":"Contracting Indices"}
{"id":"130509","text":"Angular Momentum Conservation Definition"}
{"id":"90635","text":"Freezing water in a closed container"}
{"id":"23007","text":"How much oxygen would be consumed on a 1 cm squared surface which is on fire?"}
{"id":"105316","text":"Why color of dress changes when water falls?"}
{"id":"107023","text":"Sum of independent errors"}
{"id":"73945","text":"Work done by magnetic field"}
{"id":"135377","text":"A question on quantum computing?"}
{"id":"117120","text":"Prerequisites for Griffiths electrodynamics"}
{"id":"22960","text":"Flying a toy helicopter inside an accelerating train"}
{"id":"5839","text":"Does magnetic propagation follow the speed of light?"}
{"id":"106543","text":"Why earth looks always flat when it is round"}
{"id":"30909","text":"Simulator for electrostatics"}
{"id":"7112","text":"Why do people still talk about bohmian mechanics\/hidden variables"}
{"id":"18793","text":"Why do the planets' orbital distances fall on an exponential curve?"}
{"id":"19043","text":"Is one way glass possible?"}
{"id":"28527","text":"Two particles interacting by a inverse-square-law force, find their positions in function of time"}
{"id":"55719","text":"Schrodinger's cat experiment"}
{"id":"119103","text":"How does heat actually stay kept in the carbon molecules in the atmosphere?"}
{"id":"81414","text":"Why are all force particles bosons?"}
{"id":"11396","text":"Can one do the maths of physics without using $\\sqrt{-1}$?"}
{"id":"52273","text":"Is it possible for a physical object to have a irrational length?"}
{"id":"7877","text":"Pendulum with water dripping out"}
{"id":"23625","text":"How to deduce the theorem of addition of velocities?"}
{"id":"2041","text":"How are classical optics phenomena explained in QED (Snell's law)?"}
{"id":"71620","text":"On a hot day, when it's cooler outside than in; is it better to put a fan in an open window pointing inwards or outwards?"}
{"id":"19417","text":"Path integral formulation of quantum mechanics"}
{"id":"101624","text":"Can someone be too late for being a great physicist?"}
{"id":"80966","text":"Why current through all the resistors in series is considered to be same?"}
{"id":"102423","text":"Rolling disk in inclined plane and flat plane?"}
{"id":"83701","text":"What are the Time Operators in Quantum Mechanics?"}
{"id":"28720","text":"How to get Planck length"}
{"id":"70747","text":"Can inertial mass affect gravity of the object?"}
{"id":"18170","text":"Measurement of Tangential Momentum Accomodation?"}
{"id":"31395","text":"What happens to matter in a standard model with zero Higgs VEV?"}
{"id":"135096","text":"How a fan moves air?"}
{"id":"92313","text":"The definition of Lagrangian"}
{"id":"57137","text":"How soon that a force affect another object?"}
{"id":"69657","text":"How could vacuum energy cause the expansion of the universe?"}
{"id":"73825","text":"The future of supersymmetry"}
{"id":"29642","text":"In a neutron star - what force keeps the neutrons from getting closer and closer?"}
{"id":"51776","text":"How are current and voltage out of phase in capacitive circuit?"}
{"id":"130171","text":"At what speed will objects hit a singularity?"}
{"id":"47128","text":"exponential potential $ \\exp(|x|) $"}
{"id":"111696","text":"Hydrostatic pressure at the center of a water planet"}
{"id":"8420","text":"Strongest force in nature"}
{"id":"93130","text":"Is it wasteful to use a heating element, instead of doing useful work?"}
{"id":"68198","text":"Why can't some light ever reach earth?"}
{"id":"68223","text":"The secret behind the spinning, asymmetrically weighted, 2D disk-shaped top?"}
{"id":"43919","text":"Dark Energy saving the world"}
{"id":"49837","text":"How do stars look like from space?"}
{"id":"79685","text":"If the source of sound is vibration, why can't we \"hear\" a object whose molecules are vibrating?"}
{"id":"107746","text":"Spinning of the Earth"}
{"id":"70463","text":"Exchange particles-real or just mathetical constructs?"}
{"id":"7479","text":"A Basic Question about Gravity, Inertia or Momentum or something along those lines"}
{"id":"110615","text":"What does 1\/k represent regarding Newtons Law of Cooling?"}
{"id":"46327","text":"Flames with no gravity?"}
{"id":"46324","text":"To which extent is general relativity a gauge theory?"}
{"id":"34366","text":"Time taken for object in space to fall to earth"}
{"id":"87260","text":"Time Slowing Down"}
{"id":"102719","text":"What is the formula for determining time dilation (as the object in motion)?"}
{"id":"128875","text":"How to find the potential energy?"}
{"id":"73051","text":"Do cosmologically redshifted photons violate energy conservation?"}
{"id":"156","text":"How are the northern lights produced?"}
{"id":"33507","text":"Quantum mechanic newbie: why complex amplitudes, why Hilbert space?"}
{"id":"21654","text":"How to find the value of the parameter $a$ in this transfer function?"}
{"id":"28093","text":"Relation between water flow and pressure"}
{"id":"112270","text":"Thermo-Emf variation with temperature"}
{"id":"3009","text":"How exactly does curved space-time describe the force of gravity?"}
{"id":"31029","text":"How can a wooden spoon be used to prevent water from over boiling?"}
{"id":"7905","text":"Massless charged particles"}
{"id":"27041","text":"Linearizing Quantum Operators"}
{"id":"32096","text":"What exactly is a kilogram-meter?"}
{"id":"22404","text":"Will the hole on a metal disc expand or contract upon heating?"}
{"id":"102791","text":"Quarks are now considered to be fundamentals, but so were atoms some time ago. So the way we see is only limited by our technological advances?"}
{"id":"10311","text":"Does it exist a free good molecule \/ atom simulation software?"}
{"id":"18148","text":"Current against the inverse of resistance graph, $I = V\/R +c$"}
{"id":"39170","text":"Good Magnetic Simulation Software?"}
{"id":"12717","text":"Charging 12V 150Ah battery"}
{"id":"111866","text":"Intuitive meaning of Dot Product"}
{"id":"62474","text":"Does friction depend on the area between bodies thats in contact?"}
{"id":"116921","text":"Can there be Electron and\/or Proton Stars?"}
{"id":"126921","text":"Magnet motor free energy generator"}
{"id":"52024","text":"Is there any case in physics where the equations of motion depend on high time derivatives of the position?"}
{"id":"105735","text":"Rutherfords alpha scattering conclutions?"}
{"id":"107113","text":"Calculate the average temperature needed for hydrogen fusion reaction"}
{"id":"95705","text":"Why does ice form on bridges even if the temperature is above freezing?"}
{"id":"1957","text":"What is the difference between a white object and a mirror?"}
{"id":"90044","text":"Halliday resnick physics book"}
{"id":"59815","text":"Is a heavier skier faster?"}
{"id":"94040","text":"Why aren't quarks free?"}
{"id":"20056","text":"Superluminal expansion of the early universe how is this possible?"}
{"id":"119176","text":"How does gamma ray emission make an atom more stable?"}
{"id":"101674","text":"Gaussian Integral by Substitution"}
{"id":"11686","text":"finding angular velocity and regular velocity when bouncing off a surface with friction"}
{"id":"6863","text":"Why does Fukushima pressure rise?"}
{"id":"34130","text":"How to make a monopole magnet?"}
{"id":"36412","text":"What gives matter Gravitational Mass?"}
{"id":"70186","text":"Are Newton's \"laws\" of motion laws or definitions of force and mass?"}
{"id":"7421","text":"Brachistochrone Problem for Inhomogeneous Potential"}
{"id":"133431","text":"Can expansion of space create energy?"}
{"id":"19536","text":"Is there a Non-perturbative renormalization algorithm?"}
{"id":"113647","text":"The relationship between the Hubble Constant and cosmological time"}
{"id":"51723","text":"How were the crystal lattices of elements determined to perfection ? (Ex:- That of a copper is a cubic lattice )"}
{"id":"75977","text":"Is Veneziano amplitude able to explain the physical properties of strongly interacting hadrons (such as proton and neutron)?"}
{"id":"9864","text":"How to define angular momentum in other than three dimensions?"}
{"id":"45849","text":"Origin of lepton\/quark generations?"}
{"id":"110207","text":"While Space-man lives for 1 day, then how long does Earth-man live ? 1000 years or 1 second?"}
{"id":"102370","text":"Why do particular materials allow particular light waves to pass through them?"}
{"id":"3656","text":"Can spacetime be non-orientable?"}
{"id":"112011","text":"Nonzero ground state energy of the quantum harmonic oscillator"}
{"id":"86270","text":"Dual nature of Matter at gross level"}
{"id":"130773","text":"Why does coke fizz more when you add ice"}
{"id":"15684","text":"What are the mechanics by which Time Dilation and Length Contraction occur?"}
{"id":"52195","text":"Ultrasonic wave through air"}
{"id":"68955","text":"How does dark matter halo outside a galaxy help to explain galaxy rotation curve?"}
{"id":"110581","text":"Do COBE, WMAP, or Planck data show time-variance of the CMB's anisotropies?"}
{"id":"63456","text":"Does the slinky base stay perfectly level during the initial free fall"}
{"id":"37772","text":"Why doesn't a fly fall off the wall?"}
{"id":"49956","text":"Any new texts directly on second law of thermodynamics?"}
{"id":"66363","text":"Estimating the present state of stars"}
{"id":"53790","text":"What happens if an atom absorbs a photon of energy higher than first excited state but lower than second excited state?"}
{"id":"63987","text":"Why don't electric workers get electrocuted when only touching one wire?"}
{"id":"98516","text":"What is the nature of energy?"}
{"id":"48534","text":"Does kinetic friction increase as speed increases?"}
{"id":"134356","text":"Special Relativity, 2nd Postulate -- Why?"}
{"id":"75715","text":"Elastic potential energy of compressed spring?"}
{"id":"120107","text":"What keeps objects made of gold apart?"}
{"id":"64751","text":"Derivation of the Biot-Savart Law"}
{"id":"99779","text":"Can a value of \"length, in meters\" be attributed to a pair of ends which are rigid (but not at rest) to each other?"}
{"id":"35645","text":"How does the curiosity rover get it's power?"}
{"id":"28417","text":"Why does the light bulb's brightness decrease?"}
{"id":"95889","text":"Why do surfaces act like barriers for electrons?"}
{"id":"12995","text":"Virtual particle production in space-time."}
{"id":"123173","text":"Kinematics question - Newton's Law of Motion"}
{"id":"63138","text":"Capacitors discharging in series"}
{"id":"86989","text":"What \"time\" is it for or on Voyager 1? If you could be \"still\" in the Universe who fast would time be?"}
{"id":"133230","text":"Resistors in para and series circuit, finding volt"}
{"id":"62653","text":"Attraction and repulsion of Magnetic materials"}
{"id":"41211","text":"What is the difference between a spinor and a vector or a tensor?"}
{"id":"133488","text":"Would days be longer as the polar ice caps melt?"}
{"id":"45495","text":"Why does the universe exhibit three large-scale spatial dimensions?"}
{"id":"13624","text":"Why are higher order Lagrangians called 'non-local'?"}
{"id":"66980","text":"Measurements and simultaneity"}
{"id":"105013","text":"Could a super conductor actually be used to repel gravity?"}
{"id":"4635","text":"Understanding weight on an inclined plane"}
{"id":"30616","text":"Energy efficiency of antimatter producion"}
{"id":"17408","text":"Do atmospheric physics prevent hot air balloons from ascending over 60,000ft?"}
{"id":"106501","text":"Is Dark Energy Pushing Us Or Pulling Us?"}
{"id":"129340","text":"The role of SO(3) and SU(2) in quantum mechanics"}
{"id":"20460","text":"Gauge pressure vs. absolute pressure?"}
{"id":"27423","text":"Matlab package: graphical calculus for quantum operations (esp. linear optics)"}
{"id":"41245","text":"What is the present state of Mach's Principle amongst physicists?"}
{"id":"6725","text":"If both radio waves and gamma rays can travel through walls"}
{"id":"11673","text":"Algorithm of Lightning Strikes?"}
{"id":"16082","text":"How do I find the frictional force using a free body diagram?"}