answer string | choices dict | id string | kind string | lang string | question string | steps list | subject string | text string | topic string |
|---|---|---|---|---|---|---|---|---|---|
Melting and boiling absorb energy without temperature change, hiding heat in bonds. | null | phy_0501 | concept | en | What is latent heat? | [
"Melting and boiling absorb energy without temperature change, hiding heat in bonds.",
"So the answer stands: Melting and boiling absorb energy without temperature change, hiding heat in bonds."
] | physics | Answer: Melting and boiling absorb energy without temperature change, hiding heat in bonds.
Steps:
1. Melting and boiling absorb energy without temperature change, hiding heat in bonds.
2. So the answer stands: Melting and boiling absorb energy without temperature change, hiding heat in bonds. | thermodynamics |
Time: 9.3 s. | null | phy_0502 | worked_example | en | Light travels 28×10⁸ m. Compute the travel time. (c = 3×10⁸ m/s) | [
"t = d/c.",
"t = 28×10⁸ / 3×10⁸ s.",
"= 9.3 s."
] | physics | Answer: Time: 9.3 s.
Steps:
1. t = d/c.
2. t = 28×10⁸ / 3×10⁸ s.
3. = 9.3 s. | optics |
Distance: 3740 m. | null | phy_0503 | worked_example | en | Thunder is heard 11 s after lightning. How far away is the storm? (v = 340 m/s) | [
"d = v×t.",
"d = 340 m/s × 11 s.",
"= 3740 m."
] | physics | Answer: Distance: 3740 m.
Steps:
1. d = v×t.
2. d = 340 m/s × 11 s.
3. = 3740 m. | waves |
Mass number: 25. | null | phy_0504 | worked_example | en | A nucleus has 12 protons and 13 neutrons. Compute its mass number. | [
"A = Z+N.",
"A = 12 + 13.",
"= 25."
] | physics | Answer: Mass number: 25.
Steps:
1. A = Z+N.
2. A = 12 + 13.
3. = 25. | modern |
Práce je síla krát dráha, měří se v joulech. | null | phy_0505 | concept | cs | Co je práce? | [
"Práce je síla krát dráha, měří se v joulech.",
"Odpověď tedy platí: Práce je síla krát dráha, měří se v joulech."
] | physics | Answer: Práce je síla krát dráha, měří se v joulech.
Steps:
1. Práce je síla krát dráha, měří se v joulech.
2. Odpověď tedy platí: Práce je síla krát dráha, měří se v joulech. | mechanics |
LC tunes to one frequency selectively, picking radio stations cleanly. | null | phy_0506 | concept | en | Why resonance circuits? | [
"LC tunes to one frequency selectively, picking radio stations cleanly.",
"So the answer stands: LC tunes to one frequency selectively, picking radio stations cleanly."
] | physics | Answer: LC tunes to one frequency selectively, picking radio stations cleanly.
Steps:
1. LC tunes to one frequency selectively, picking radio stations cleanly.
2. So the answer stands: LC tunes to one frequency selectively, picking radio stations cleanly. | electromagnetism |
Efficiency is 50%. | {
"A": "40%",
"B": "50%",
"C": "60%",
"D": "70%"
} | phy_0507 | multiple_choice | en | An engine turns 500 J of 1000 J heat into work. What is its efficiency? | [
"500 J / 1000 J.",
"= 50%.",
"Select option B."
] | physics | Answer: 50%
Steps:
1. 500 J / 1000 J.
2. = 50%.
3. Select option B.
Answer: (B) | thermodynamics |
Time is 5 s. | {
"A": "6 s",
"B": "5 s",
"C": "7 s",
"D": "4 s"
} | phy_0508 | multiple_choice | en | Light travels 15×10⁸ m. How many seconds does it take? (c = 3×10⁸ m/s) | [
"t = 15×10⁸ m / 3×10⁸ m/s.",
"t = 5 s.",
"Select option B."
] | physics | Answer: 5 s
Steps:
1. t = 15×10⁸ m / 3×10⁸ m/s.
2. t = 5 s.
3. Select option B.
Answer: (B) | optics |
3rd harmonic: 570 Hz. | null | phy_0509 | worked_example | en | A string's fundamental is 190 Hz. Compute its 3rd harmonic. | [
"f3 = 3×f1.",
"f3 = 3 × 190 Hz.",
"= 570 Hz."
] | physics | Answer: 3rd harmonic: 570 Hz.
Steps:
1. f3 = 3×f1.
2. f3 = 3 × 190 Hz.
3. = 570 Hz. | waves |
Photons eject electrons past threshold frequency only. | null | phy_0510 | concept | en | What is the photoelectric effect? | [
"Photons eject electrons past threshold frequency only.",
"So the answer stands: Photons eject electrons past threshold frequency only."
] | physics | Answer: Photons eject electrons past threshold frequency only.
Steps:
1. Photons eject electrons past threshold frequency only.
2. So the answer stands: Photons eject electrons past threshold frequency only. | modern |
Kinetic energy is 64 J. | {
"A": "56 J",
"B": "72 J",
"C": "64 J",
"D": "80 J"
} | phy_0511 | multiple_choice | en | A 2 kg ball moves at 8 m/s. What is its kinetic energy? | [
"KE = ½×2 kg×(8 m/s)².",
"KE = 64 J.",
"Select option C."
] | physics | Answer: 64 J
Steps:
1. KE = ½×2 kg×(8 m/s)².
2. KE = 64 J.
3. Select option C.
Answer: (C) | mechanics |
The answer is Capacitor. | {
"A": "Resistor",
"B": "Inductor",
"C": "Capacitor",
"D": "Diode"
} | phy_0512 | multiple_choice | en | Choose: what stores per volt? | [
"Plates hold charge.",
"So: Capacitor.",
"Select option C."
] | physics | Answer: Capacitor
Steps:
1. Plates hold charge.
2. So: Capacitor.
3. Select option C.
Answer: (C) | electromagnetism |
Heat: 83720 J. | null | phy_0513 | worked_example | en | How much heat warms 2 kg of water by 10 K? (c = 4186 J/(kg·K)) | [
"Q = 2 kg × 4186 J/(kg·K) × 10 K.",
"= 83720 J."
] | physics | Answer: Heat: 83720 J.
Steps:
1. Q = 2 kg × 4186 J/(kg·K) × 10 K.
2. = 83720 J. | thermodynamics |
Zdánlivá hloubka: 50 cm. | null | phy_0514 | worked_example | cs | Předmět leží 75 cm hluboko ve skle (n = 1,5). Spočítej zdánlivou hloubku. | [
"d' = d/n.",
"d' = 75 cm / 1,5.",
"= 50 cm."
] | physics | Answer: Zdánlivá hloubka: 50 cm.
Steps:
1. d' = d/n.
2. d' = 75 cm / 1,5.
3. = 50 cm. | optics |
3. harmonická je 360 Hz. | {
"A": "330 Hz",
"B": "390 Hz",
"C": "420 Hz",
"D": "360 Hz"
} | phy_0515 | multiple_choice | cs | Základ struny je 120 Hz. Jaká je její 3. harmonická? | [
"f3 = 3 × 120 Hz.",
"f3 = 360 Hz.",
"Vyber možnost D."
] | physics | Answer: 360 Hz
Steps:
1. f3 = 3 × 120 Hz.
2. f3 = 360 Hz.
3. Vyber možnost D.
Answer: (D) | waves |
Přeživší: 600. | null | phy_0516 | worked_example | cs | Vzorek 2400 atomů projde 2 poločasy. Spočítej přeživší. | [
"Půl: 2400 → 1200.",
"Půl: 1200 → 600.",
"= 600."
] | physics | Answer: Přeživší: 600.
Steps:
1. Půl: 2400 → 1200.
2. Půl: 1200 → 600.
3. = 600. | modern |
The answer is Projectiles. | {
"A": "Orbits",
"B": "Pendulums",
"C": "Gears",
"D": "Projectiles"
} | phy_0517 | multiple_choice | en | Choose: what traces parabolas? | [
"Gravity bends paths.",
"So: Projectiles.",
"Select option D."
] | physics | Answer: Projectiles
Steps:
1. Gravity bends paths.
2. So: Projectiles.
3. Select option D.
Answer: (D) | mechanics |
Four laws unify electricity and magnetism, predicting light as waves. | null | phy_0518 | concept | en | What are Maxwell's equations? | [
"Four laws unify electricity and magnetism, predicting light as waves.",
"So the answer stands: Four laws unify electricity and magnetism, predicting light as waves."
] | physics | Answer: Four laws unify electricity and magnetism, predicting light as waves.
Steps:
1. Four laws unify electricity and magnetism, predicting light as waves.
2. So the answer stands: Four laws unify electricity and magnetism, predicting light as waves. | electromagnetism |
Výkon: 60 W. | null | phy_0519 | worked_example | cs | Motor vykoná 600 J práce za 10 s. Spočítej jeho výkon. | [
"P = W/t.",
"P = 600 J / 10 s.",
"= 60 W."
] | physics | Answer: Výkon: 60 W.
Steps:
1. P = W/t.
2. P = 600 J / 10 s.
3. = 60 W. | thermodynamics |
Apparent depth is 60 cm. | {
"A": "55 cm",
"B": "65 cm",
"C": "60 cm",
"D": "70 cm"
} | phy_0520 | multiple_choice | en | An object sits 90 cm deep in glass (n = 1.5). What is the apparent depth? | [
"d' = 90 cm / 1.5.",
"d' = 60 cm.",
"Select option C."
] | physics | Answer: 60 cm
Steps:
1. d' = 90 cm / 1.5.
2. d' = 60 cm.
3. Select option C.
Answer: (C) | optics |
The answer is Doppler pitch. | {
"A": "Static volume",
"B": "Calm tempo",
"C": "Doppler pitch",
"D": "Fixed key"
} | phy_0521 | multiple_choice | en | Choose: what shifts with motion? | [
"Approach raises.",
"So: Doppler pitch.",
"Select option C."
] | physics | Answer: Doppler pitch
Steps:
1. Approach raises.
2. So: Doppler pitch.
3. Select option C.
Answer: (C) | waves |
Odpověď je štěpení. | {
"A": "štěpení",
"B": "fúze",
"C": "móda",
"D": "fikce"
} | phy_0522 | multiple_choice | cs | Vyber: co dělí těžké? | [
"Reaktory řetězeny.",
"Tedy: štěpení.",
"Vyber možnost A."
] | physics | Answer: štěpení
Steps:
1. Reaktory řetězeny.
2. Tedy: štěpení.
3. Vyber možnost A.
Answer: (A) | modern |
Momentum mv persists through collisions, predicting outcomes via conservation. | null | phy_0523 | concept | en | Why momentum? | [
"Momentum mv persists through collisions, predicting outcomes via conservation.",
"So the answer stands: Momentum mv persists through collisions, predicting outcomes via conservation."
] | physics | Answer: Momentum mv persists through collisions, predicting outcomes via conservation.
Steps:
1. Momentum mv persists through collisions, predicting outcomes via conservation.
2. So the answer stands: Momentum mv persists through collisions, predicting outcomes via conservation. | mechanics |
Power: 300 W. | null | phy_0524 | worked_example | en | A current of 10 A flows through 3 Ω. Compute the dissipated power. | [
"P = I²×R.",
"P = (10 A)² × 3 Ω.",
"= 300 W."
] | physics | Answer: Power: 300 W.
Steps:
1. P = I²×R.
2. P = (10 A)² × 3 Ω.
3. = 300 W. | electromagnetism |
Power: 140 W. | null | phy_0525 | worked_example | en | An engine does 1400 J of work in 10 s. Compute its power. | [
"P = W/t.",
"P = 1400 J / 10 s.",
"= 140 W."
] | physics | Answer: Power: 140 W.
Steps:
1. P = W/t.
2. P = 1400 J / 10 s.
3. = 140 W. | thermodynamics |
Apparent depth: 110 cm. | null | phy_0526 | worked_example | en | An object sits 165 cm deep in glass (n = 1.5). Compute the apparent depth. | [
"d' = d/n.",
"d' = 165 cm / 1.5.",
"= 110 cm."
] | physics | Answer: Apparent depth: 110 cm.
Steps:
1. d' = d/n.
2. d' = 165 cm / 1.5.
3. = 110 cm. | optics |
The answer is Anti-phase. | {
"A": "More bass",
"B": "Less treble",
"C": "Pure luck",
"D": "Anti-phase"
} | phy_0527 | multiple_choice | en | Choose: what erases rumble? | [
"Quiet engineered.",
"So: Anti-phase.",
"Select option D."
] | physics | Answer: Anti-phase
Steps:
1. Quiet engineered.
2. So: Anti-phase.
3. Select option D.
Answer: (D) | waves |
The answer is Antimatter. | {
"A": "Dark matter",
"B": "Gray area",
"C": "Cold feet",
"D": "Antimatter"
} | phy_0528 | multiple_choice | en | Choose: what burns on contact? | [
"Gamma flashed.",
"So: Antimatter.",
"Select option D."
] | physics | Answer: Antimatter
Steps:
1. Gamma flashed.
2. So: Antimatter.
3. Select option D.
Answer: (D) | modern |
Impulse is force times time, equal to momentum change in every shove. | null | phy_0529 | concept | en | What is impulse? | [
"Impulse is force times time, equal to momentum change in every shove.",
"So the answer stands: Impulse is force times time, equal to momentum change in every shove."
] | physics | Answer: Impulse is force times time, equal to momentum change in every shove.
Steps:
1. Impulse is force times time, equal to momentum change in every shove.
2. So the answer stands: Impulse is force times time, equal to momentum change in every shove. | mechanics |
The answer is Diode. | {
"A": "Wire",
"B": "Fuse",
"C": "Switch",
"D": "Diode"
} | phy_0530 | multiple_choice | en | Choose: what passes one way? | [
"AC rectified.",
"So: Diode.",
"Select option D."
] | physics | Answer: Diode
Steps:
1. AC rectified.
2. So: Diode.
3. Select option D.
Answer: (D) | electromagnetism |
Teplota: 290 K. | null | phy_0531 | worked_example | cs | Teplota je 17 °C. Převeď ji na kelviny. | [
"Přičti 273.",
"17 + 273.",
"= 290 K."
] | physics | Answer: Teplota: 290 K.
Steps:
1. Přičti 273.
2. 17 + 273.
3. = 290 K. | thermodynamics |
Magnification: 12×. | null | phy_0532 | worked_example | en | An image forms 120 cm from a lens, object at 10 cm. Compute the magnification. | [
"M = di/do.",
"M = 120 cm / 10 cm.",
"= 12×."
] | physics | Answer: Magnification: 12×.
Steps:
1. M = di/do.
2. M = 120 cm / 10 cm.
3. = 12×. | optics |
Speed is 600 m/s. | {
"A": "600 m/s",
"B": "550 m/s",
"C": "650 m/s",
"D": "700 m/s"
} | phy_0533 | multiple_choice | en | A string wave has f = 300 Hz and λ = 2 m. What is its speed? | [
"v = 300 Hz × 2 m.",
"v = 600 m/s.",
"Select option A."
] | physics | Answer: 600 m/s
Steps:
1. v = 300 Hz × 2 m.
2. v = 600 m/s.
3. Select option A.
Answer: (A) | waves |
Junction fields sweep freed charges into current efficiently. | null | phy_0534 | concept | en | Why solar cells? | [
"Junction fields sweep freed charges into current efficiently.",
"So the answer stands: Junction fields sweep freed charges into current efficiently."
] | physics | Answer: Junction fields sweep freed charges into current efficiently.
Steps:
1. Junction fields sweep freed charges into current efficiently.
2. So the answer stands: Junction fields sweep freed charges into current efficiently. | modern |
Momentum: 39 kg·m/s. | null | phy_0535 | worked_example | en | A mass of 13 kg moves at 3 m/s. Compute its momentum. | [
"p = m×v.",
"p = 13 kg × 3 m/s.",
"= 39 kg·m/s."
] | physics | Answer: Momentum: 39 kg·m/s.
Steps:
1. p = m×v.
2. p = 13 kg × 3 m/s.
3. = 39 kg·m/s. | mechanics |
Voltage: 120 V. | null | phy_0536 | worked_example | en | A current of 10 A flows through 12 Ω. Compute the voltage. | [
"V = I×R.",
"V = 10 A × 12 Ω.",
"= 120 V."
] | physics | Answer: Voltage: 120 V.
Steps:
1. V = I×R.
2. V = 10 A × 12 Ω.
3. = 120 V. | electromagnetism |
The answer is Water's heat. | {
"A": "Iron's mass",
"B": "Sand's color",
"C": "Water's heat",
"D": "Air's smell"
} | phy_0537 | multiple_choice | en | Choose: what buffers climate? | [
"High capacity held.",
"So: Water's heat.",
"Select option C."
] | physics | Answer: Water's heat
Steps:
1. High capacity held.
2. So: Water's heat.
3. Select option C.
Answer: (C) | thermodynamics |
Čas je 2 s. | {
"A": "3 s",
"B": "4 s",
"C": "2 s",
"D": "1 s"
} | phy_0538 | multiple_choice | cs | Světlo letí 6×10⁸ m. Kolik sekund to trvá? (c = 3×10⁸ m/s) | [
"t = 6×10⁸ m / 3×10⁸ m/s.",
"t = 2 s.",
"Vyber možnost C."
] | physics | Answer: 2 s
Steps:
1. t = 6×10⁸ m / 3×10⁸ m/s.
2. t = 2 s.
3. Vyber možnost C.
Answer: (C) | optics |
Tlakové vlny vzduchu slyšitelné ušima. | null | phy_0539 | concept | cs | Co je zvuk? | [
"Tlakové vlny vzduchu slyšitelné ušima.",
"Odpověď tedy platí: Tlakové vlny vzduchu slyšitelné ušima."
] | physics | Answer: Tlakové vlny vzduchu slyšitelné ušima.
Steps:
1. Tlakové vlny vzduchu slyšitelné ušima.
2. Odpověď tedy platí: Tlakové vlny vzduchu slyšitelné ušima. | waves |
500 atoms remain. | {
"A": "500",
"B": "450",
"C": "550",
"D": "600"
} | phy_0540 | multiple_choice | en | A sample of 2000 atoms undergoes 2 half-lives. How many remain? | [
"Halve twice: 2000 → 1000 → 500.",
"Left: 500.",
"Select option A."
] | physics | Answer: 500
Steps:
1. Halve twice: 2000 → 1000 → 500.
2. Left: 500.
3. Select option A.
Answer: (A) | modern |
They conserve kinetic energy too, so balls bounce with speeds solvable exactly. | null | phy_0541 | concept | en | Why elastic collisions? | [
"They conserve kinetic energy too, so balls bounce with speeds solvable exactly.",
"So the answer stands: They conserve kinetic energy too, so balls bounce with speeds solvable exactly."
] | physics | Answer: They conserve kinetic energy too, so balls bounce with speeds solvable exactly.
Steps:
1. They conserve kinetic energy too, so balls bounce with speeds solvable exactly.
2. So the answer stands: They conserve kinetic energy too, so balls bounce with speeds solvable exactly. | mechanics |
Maxwell's wave speed matched measured c, revealing light as electromagnetism. | null | phy_0542 | concept | en | Why light is EM? | [
"Maxwell's wave speed matched measured c, revealing light as electromagnetism.",
"So the answer stands: Maxwell's wave speed matched measured c, revealing light as electromagnetism."
] | physics | Answer: Maxwell's wave speed matched measured c, revealing light as electromagnetism.
Steps:
1. Maxwell's wave speed matched measured c, revealing light as electromagnetism.
2. So the answer stands: Maxwell's wave speed matched measured c, revealing light as electromagnetism. | electromagnetism |
Teplo: 25116 J. | null | phy_0543 | worked_example | cs | Kolik tepla ohřeje 2 kg vody o 3 K? (c = 4186 J/(kg·K)) | [
"Q = 2 kg × 4186 J/(kg·K) × 3 K.",
"= 25116 J."
] | physics | Answer: Teplo: 25116 J.
Steps:
1. Q = 2 kg × 4186 J/(kg·K) × 3 K.
2. = 25116 J. | thermodynamics |
The answer is Lens. | {
"A": "Mirror",
"B": "Prism",
"C": "Filter",
"D": "Lens"
} | phy_0544 | multiple_choice | en | Choose: what focuses rays? | [
"Glass curves bend.",
"So: Lens.",
"Select option D."
] | physics | Answer: Lens
Steps:
1. Glass curves bend.
2. So: Lens.
3. Select option D.
Answer: (D) | optics |
Ears span 20 Hz to 20 kHz, narrowing with age and damage. | null | phy_0545 | concept | en | Why hearing range? | [
"Ears span 20 Hz to 20 kHz, narrowing with age and damage.",
"So the answer stands: Ears span 20 Hz to 20 kHz, narrowing with age and damage."
] | physics | Answer: Ears span 20 Hz to 20 kHz, narrowing with age and damage.
Steps:
1. Ears span 20 Hz to 20 kHz, narrowing with age and damage.
2. So the answer stands: Ears span 20 Hz to 20 kHz, narrowing with age and damage. | waves |
Unstable nuclei decay randomly with fixed half-lives. | null | phy_0546 | concept | en | What is radioactivity? | [
"Unstable nuclei decay randomly with fixed half-lives.",
"So the answer stands: Unstable nuclei decay randomly with fixed half-lives."
] | physics | Answer: Unstable nuclei decay randomly with fixed half-lives.
Steps:
1. Unstable nuclei decay randomly with fixed half-lives.
2. So the answer stands: Unstable nuclei decay randomly with fixed half-lives. | modern |
The answer is Hooke's law. | {
"A": "Hooke's law",
"B": "Ohm's law",
"C": "Boyle's law",
"D": "Moore's law"
} | phy_0547 | multiple_choice | en | Choose: what pulls springs back? | [
"Force minus kx.",
"So: Hooke's law.",
"Select option A."
] | physics | Answer: Hooke's law
Steps:
1. Force minus kx.
2. So: Hooke's law.
3. Select option A.
Answer: (A) | mechanics |
Energy: 1400 J. | null | phy_0548 | worked_example | en | A 100 W heater runs for 14 s. Compute the energy used. | [
"E = P×t.",
"E = 100 W × 14 s.",
"= 1400 J."
] | physics | Answer: Energy: 1400 J.
Steps:
1. E = P×t.
2. E = 100 W × 14 s.
3. = 1400 J. | electromagnetism |
Teplo je 12558 J. | {
"A": "8372 J",
"B": "16744 J",
"C": "12558 J",
"D": "20930 J"
} | phy_0549 | multiple_choice | cs | Kolik tepla ohřeje 1 kg vody o 3 K? (c = 4186 J/(kg·K)) | [
"Q = 1 kg × 4186 J/(kg·K) × 3 K.",
"Q = 12558 J.",
"Vyber možnost C."
] | physics | Answer: 12558 J
Steps:
1. Q = 1 kg × 4186 J/(kg·K) × 3 K.
2. Q = 12558 J.
3. Vyber možnost C.
Answer: (C) | thermodynamics |
Short waves scatter strongest off air, filling heavens with blue. | null | phy_0550 | concept | en | Why blue sky? | [
"Short waves scatter strongest off air, filling heavens with blue.",
"So the answer stands: Short waves scatter strongest off air, filling heavens with blue."
] | physics | Answer: Short waves scatter strongest off air, filling heavens with blue.
Steps:
1. Short waves scatter strongest off air, filling heavens with blue.
2. So the answer stands: Short waves scatter strongest off air, filling heavens with blue. | optics |
Above-hearing waves image babies and clean parts precisely. | null | phy_0551 | concept | en | What is ultrasound? | [
"Above-hearing waves image babies and clean parts precisely.",
"So the answer stands: Above-hearing waves image babies and clean parts precisely."
] | physics | Answer: Above-hearing waves image babies and clean parts precisely.
Steps:
1. Above-hearing waves image babies and clean parts precisely.
2. So the answer stands: Above-hearing waves image babies and clean parts precisely. | waves |
Each period halves survivors statistically, dating rocks and relics. | null | phy_0552 | concept | en | Why half-life? | [
"Each period halves survivors statistically, dating rocks and relics.",
"So the answer stands: Each period halves survivors statistically, dating rocks and relics."
] | physics | Answer: Each period halves survivors statistically, dating rocks and relics.
Steps:
1. Each period halves survivors statistically, dating rocks and relics.
2. So the answer stands: Each period halves survivors statistically, dating rocks and relics. | modern |
Net force: 24 N. | null | phy_0553 | worked_example | en | A mass of 12 kg accelerates at 2 m/s². Compute the net force. | [
"F = m×a.",
"F = 12 kg × 2 m/s².",
"= 24 N."
] | physics | Answer: Net force: 24 N.
Steps:
1. F = m×a.
2. F = 12 kg × 2 m/s².
3. = 24 N. | mechanics |
Power: 363 W. | null | phy_0554 | worked_example | en | A current of 11 A flows through 3 Ω. Compute the dissipated power. | [
"P = I²×R.",
"P = (11 A)² × 3 Ω.",
"= 363 W."
] | physics | Answer: Power: 363 W.
Steps:
1. P = I²×R.
2. P = (11 A)² × 3 Ω.
3. = 363 W. | electromagnetism |
The answer is Latent heat. | {
"A": "Loud noise",
"B": "Bright light",
"C": "Fast wind",
"D": "Latent heat"
} | phy_0555 | multiple_choice | en | Choose: what hides in bonds? | [
"Temp stays flat.",
"So: Latent heat.",
"Select option D."
] | physics | Answer: Latent heat
Steps:
1. Temp stays flat.
2. So: Latent heat.
3. Select option D.
Answer: (D) | thermodynamics |
The answer is c in m/s. | {
"A": "c in m/s",
"B": "g in m/s²",
"C": "h in J·s",
"D": "e in C"
} | phy_0556 | multiple_choice | en | Choose: what is exactly 299792458? | [
"Cosmic limit set.",
"So: c in m/s.",
"Select option A."
] | physics | Answer: c in m/s
Steps:
1. Cosmic limit set.
2. So: c in m/s.
3. Select option A.
Answer: (A) | optics |
Low rumbles travel far, warning of quakes and storms. | null | phy_0557 | concept | en | Why infrasound? | [
"Low rumbles travel far, warning of quakes and storms.",
"So the answer stands: Low rumbles travel far, warning of quakes and storms."
] | physics | Answer: Low rumbles travel far, warning of quakes and storms.
Steps:
1. Low rumbles travel far, warning of quakes and storms.
2. So the answer stands: Low rumbles travel far, warning of quakes and storms. | waves |
Heavy nuclei split releasing neutrons and energy, chaining reactors. | null | phy_0558 | concept | en | What is fission? | [
"Heavy nuclei split releasing neutrons and energy, chaining reactors.",
"So the answer stands: Heavy nuclei split releasing neutrons and energy, chaining reactors."
] | physics | Answer: Heavy nuclei split releasing neutrons and energy, chaining reactors.
Steps:
1. Heavy nuclei split releasing neutrons and energy, chaining reactors.
2. So the answer stands: Heavy nuclei split releasing neutrons and energy, chaining reactors. | modern |
Torque is force times lever arm, twisting objects into rotation. | null | phy_0559 | concept | en | What is torque? | [
"Torque is force times lever arm, twisting objects into rotation.",
"So the answer stands: Torque is force times lever arm, twisting objects into rotation."
] | physics | Answer: Torque is force times lever arm, twisting objects into rotation.
Steps:
1. Torque is force times lever arm, twisting objects into rotation.
2. So the answer stands: Torque is force times lever arm, twisting objects into rotation. | mechanics |
Voltage is 30 V. | {
"A": "30 V",
"B": "25 V",
"C": "35 V",
"D": "40 V"
} | phy_0560 | multiple_choice | en | A current of 6 A flows through 5 Ω. What is the voltage? | [
"V = 6 A × 5 Ω.",
"V = 30 V.",
"Select option A."
] | physics | Answer: 30 V
Steps:
1. V = 6 A × 5 Ω.
2. V = 30 V.
3. Select option A.
Answer: (A) | electromagnetism |
Temperature: 298 K. | null | phy_0561 | worked_example | en | Temperature is 25 °C. Convert it to kelvin. | [
"Add 273.",
"25 + 273.",
"= 298 K."
] | physics | Answer: Temperature: 298 K.
Steps:
1. Add 273.
2. 25 + 273.
3. = 298 K. | thermodynamics |
Zvětšení: 6×. | null | phy_0562 | worked_example | cs | Obraz vzniká 60 cm od čočky, předmět v 10 cm. Spočítej zvětšení. | [
"M = di/do.",
"M = 60 cm / 10 cm.",
"= 6×."
] | physics | Answer: Zvětšení: 6×.
Steps:
1. M = di/do.
2. M = 60 cm / 10 cm.
3. = 6×. | optics |
Speed: 2100 m/s. | null | phy_0563 | worked_example | en | A string wave has f = 700 Hz and λ = 3 m. Compute its speed. | [
"v = f×λ.",
"v = 700 Hz × 3 m.",
"= 2100 m/s."
] | physics | Answer: Speed: 2100 m/s.
Steps:
1. v = f×λ.
2. v = 700 Hz × 3 m.
3. = 2100 m/s. | waves |
Survivors: 2200. | null | phy_0564 | worked_example | en | A sample of 8800 atoms undergoes 2 half-lives. Compute the survivors. | [
"Halve: 8800 → 4400.",
"Halve: 4400 → 2200.",
"= 2200."
] | physics | Answer: Survivors: 2200.
Steps:
1. Halve: 8800 → 4400.
2. Halve: 4400 → 2200.
3. = 2200. | modern |
It resists angular change like mass resists linear, growing with radius squared. | null | phy_0565 | concept | en | Why moment of inertia? | [
"It resists angular change like mass resists linear, growing with radius squared.",
"So the answer stands: It resists angular change like mass resists linear, growing with radius squared."
] | physics | Answer: It resists angular change like mass resists linear, growing with radius squared.
Steps:
1. It resists angular change like mass resists linear, growing with radius squared.
2. So the answer stands: It resists angular change like mass resists linear, growing with radius squared. | mechanics |
Voltage: 132 V. | null | phy_0566 | worked_example | en | A current of 11 A flows through 12 Ω. Compute the voltage. | [
"V = I×R.",
"V = 11 A × 12 Ω.",
"= 132 V."
] | physics | Answer: Voltage: 132 V.
Steps:
1. V = I×R.
2. V = 11 A × 12 Ω.
3. = 132 V. | electromagnetism |
Heat: 92092 J. | null | phy_0567 | worked_example | en | How much heat warms 2 kg of water by 11 K? (c = 4186 J/(kg·K)) | [
"Q = 2 kg × 4186 J/(kg·K) × 11 K.",
"= 92092 J."
] | physics | Answer: Heat: 92092 J.
Steps:
1. Q = 2 kg × 4186 J/(kg·K) × 11 K.
2. = 92092 J. | thermodynamics |
It gathers faint light with big mirrors, magnifying distant worlds. | null | phy_0568 | concept | en | What is a telescope? | [
"It gathers faint light with big mirrors, magnifying distant worlds.",
"So the answer stands: It gathers faint light with big mirrors, magnifying distant worlds."
] | physics | Answer: It gathers faint light with big mirrors, magnifying distant worlds.
Steps:
1. It gathers faint light with big mirrors, magnifying distant worlds.
2. So the answer stands: It gathers faint light with big mirrors, magnifying distant worlds. | optics |
Radio to gamma waves differ only in wavelength and energy. | null | phy_0569 | concept | en | What is the electromagnetic spectrum? | [
"Radio to gamma waves differ only in wavelength and energy.",
"So the answer stands: Radio to gamma waves differ only in wavelength and energy."
] | physics | Answer: Radio to gamma waves differ only in wavelength and energy.
Steps:
1. Radio to gamma waves differ only in wavelength and energy.
2. So the answer stands: Radio to gamma waves differ only in wavelength and energy. | waves |
Light nuclei merge dropping mass-energy, lighting suns. | null | phy_0570 | concept | en | Why fusion powers stars? | [
"Light nuclei merge dropping mass-energy, lighting suns.",
"So the answer stands: Light nuclei merge dropping mass-energy, lighting suns."
] | physics | Answer: Light nuclei merge dropping mass-energy, lighting suns.
Steps:
1. Light nuclei merge dropping mass-energy, lighting suns.
2. So the answer stands: Light nuclei merge dropping mass-energy, lighting suns. | modern |
Work: 220 J. | null | phy_0571 | worked_example | en | A force of 55 N pushes 4 m. Compute the work done. | [
"W = F×d.",
"W = 55 N × 4 m.",
"= 220 J."
] | physics | Answer: Work: 220 J.
Steps:
1. W = F×d.
2. W = 55 N × 4 m.
3. = 220 J. | mechanics |
It filters light's oscillation direction, cutting glare through sunglasses. | null | phy_0572 | concept | en | How does polarization cut glare? | [
"It filters light's oscillation direction, cutting glare through sunglasses.",
"So the answer stands: It filters light's oscillation direction, cutting glare through sunglasses."
] | physics | Answer: It filters light's oscillation direction, cutting glare through sunglasses.
Steps:
1. It filters light's oscillation direction, cutting glare through sunglasses.
2. So the answer stands: It filters light's oscillation direction, cutting glare through sunglasses. | electromagnetism |
Power: 150 W. | null | phy_0573 | worked_example | en | An engine does 1500 J of work in 10 s. Compute its power. | [
"P = W/t.",
"P = 1500 J / 10 s.",
"= 150 W."
] | physics | Answer: Power: 150 W.
Steps:
1. P = W/t.
2. P = 1500 J / 10 s.
3. = 150 W. | thermodynamics |
Magnification is 7×. | {
"A": "6×",
"B": "7×",
"C": "8×",
"D": "9×"
} | phy_0574 | multiple_choice | en | An image forms 70 cm from a lens, object at 10 cm. What is the magnification? | [
"M = 70 cm / 10 cm.",
"M = 7×.",
"Select option B."
] | physics | Answer: 7×
Steps:
1. M = 70 cm / 10 cm.
2. M = 7×.
3. Select option B.
Answer: (B) | optics |
Antennas launch metre waves carrying modulated signals far. | null | phy_0575 | concept | en | Why radio works? | [
"Antennas launch metre waves carrying modulated signals far.",
"So the answer stands: Antennas launch metre waves carrying modulated signals far."
] | physics | Answer: Antennas launch metre waves carrying modulated signals far.
Steps:
1. Antennas launch metre waves carrying modulated signals far.
2. So the answer stands: Antennas launch metre waves carrying modulated signals far. | waves |
Lines: 91. | null | phy_0576 | worked_example | en | An atom is excited to level n = 14. Count the spectral lines it can emit. | [
"Pairs: 14×13/2.",
"= 182/2.",
"= 91."
] | physics | Answer: Lines: 91.
Steps:
1. Pairs: 14×13/2.
2. = 182/2.
3. = 91. | modern |
Spinning L persists unless torque acts, so skaters speed by pulling arms. | null | phy_0577 | concept | en | What is angular momentum? | [
"Spinning L persists unless torque acts, so skaters speed by pulling arms.",
"So the answer stands: Spinning L persists unless torque acts, so skaters speed by pulling arms."
] | physics | Answer: Spinning L persists unless torque acts, so skaters speed by pulling arms.
Steps:
1. Spinning L persists unless torque acts, so skaters speed by pulling arms.
2. So the answer stands: Spinning L persists unless torque acts, so skaters speed by pulling arms. | mechanics |
Energy: 1500 J. | null | phy_0578 | worked_example | en | A 100 W heater runs for 15 s. Compute the energy used. | [
"E = P×t.",
"E = 100 W × 15 s.",
"= 1500 J."
] | physics | Answer: Energy: 1500 J.
Steps:
1. E = P×t.
2. E = 100 W × 15 s.
3. = 1500 J. | electromagnetism |
Temperature: 299 K. | null | phy_0579 | worked_example | en | Temperature is 26 °C. Convert it to kelvin. | [
"Add 273.",
"26 + 273.",
"= 299 K."
] | physics | Answer: Temperature: 299 K.
Steps:
1. Add 273.
2. 26 + 273.
3. = 299 K. | thermodynamics |
Time: 10.3 s. | null | phy_0580 | worked_example | en | Light travels 31×10⁸ m. Compute the travel time. (c = 3×10⁸ m/s) | [
"t = d/c.",
"t = 31×10⁸ / 3×10⁸ s.",
"= 10.3 s."
] | physics | Answer: Time: 10.3 s.
Steps:
1. t = d/c.
2. t = 31×10⁸ / 3×10⁸ s.
3. = 10.3 s. | optics |
Distance: 4080 m. | null | phy_0581 | worked_example | en | Thunder is heard 12 s after lightning. How far away is the storm? (v = 340 m/s) | [
"d = v×t.",
"d = 340 m/s × 12 s.",
"= 4080 m."
] | physics | Answer: Distance: 4080 m.
Steps:
1. d = v×t.
2. d = 340 m/s × 12 s.
3. = 4080 m. | waves |
Mass number: 27. | null | phy_0582 | worked_example | en | A nucleus has 13 protons and 14 neutrons. Compute its mass number. | [
"A = Z+N.",
"A = 13 + 14.",
"= 27."
] | physics | Answer: Mass number: 27.
Steps:
1. A = Z+N.
2. A = 13 + 14.
3. = 27. | modern |
Net force is 21 N. | {
"A": "18 N",
"B": "21 N",
"C": "24 N",
"D": "27 N"
} | phy_0583 | multiple_choice | en | A mass of 7 kg accelerates at 3 m/s². What is the net force? | [
"F = 7 kg × 3 m/s².",
"F = 21 N.",
"Select option B."
] | physics | Answer: 21 N
Steps:
1. F = 7 kg × 3 m/s².
2. F = 21 N.
3. Select option B.
Answer: (B) | mechanics |
Odpověď je měnící se tok. | {
"A": "měnící se tok",
"B": "stálé teplo",
"C": "klidný vzduch",
"D": "temná místnost"
} | phy_0584 | multiple_choice | cs | Vyber: co budí cívky? | [
"Indukce vládne.",
"Tedy: měnící se tok.",
"Vyber možnost A."
] | physics | Answer: měnící se tok
Steps:
1. Indukce vládne.
2. Tedy: měnící se tok.
3. Vyber možnost A.
Answer: (A) | electromagnetism |
Heat: 100464 J. | null | phy_0585 | worked_example | en | How much heat warms 2 kg of water by 12 K? (c = 4186 J/(kg·K)) | [
"Q = 2 kg × 4186 J/(kg·K) × 12 K.",
"= 100464 J."
] | physics | Answer: Heat: 100464 J.
Steps:
1. Q = 2 kg × 4186 J/(kg·K) × 12 K.
2. = 100464 J. | thermodynamics |
Čas: 4,3 s. | null | phy_0586 | worked_example | cs | Světlo letí 13×10⁸ m. Spočítej dobu letu. (c = 3×10⁸ m/s) | [
"t = d/c.",
"t = 13×10⁸ / 3×10⁸ s.",
"= 4,3 s."
] | physics | Answer: Čas: 4,3 s.
Steps:
1. t = d/c.
2. t = 13×10⁸ / 3×10⁸ s.
3. = 4,3 s. | optics |
3rd harmonic: 600 Hz. | null | phy_0587 | worked_example | en | A string's fundamental is 200 Hz. Compute its 3rd harmonic. | [
"f3 = 3×f1.",
"f3 = 3 × 200 Hz.",
"= 600 Hz."
] | physics | Answer: 3rd harmonic: 600 Hz.
Steps:
1. f3 = 3×f1.
2. f3 = 3 × 200 Hz.
3. = 600 Hz. | waves |
Survivors: 2400. | null | phy_0588 | worked_example | en | A sample of 9600 atoms undergoes 2 half-lives. Compute the survivors. | [
"Halve: 9600 → 4800.",
"Halve: 4800 → 2400.",
"= 2400."
] | physics | Answer: Survivors: 2400.
Steps:
1. Halve: 9600 → 4800.
2. Halve: 4800 → 2400.
3. = 2400. | modern |
Momentum: 42 kg·m/s. | null | phy_0589 | worked_example | en | A mass of 14 kg moves at 3 m/s. Compute its momentum. | [
"p = m×v.",
"p = 14 kg × 3 m/s.",
"= 42 kg·m/s."
] | physics | Answer: Momentum: 42 kg·m/s.
Steps:
1. p = m×v.
2. p = 14 kg × 3 m/s.
3. = 42 kg·m/s. | mechanics |
Výkon: 48 W. | null | phy_0590 | worked_example | cs | Proud 4 A teče přes 3 Ω. Spočítej ztrátový výkon. | [
"P = I²×R.",
"P = (4 A)² × 3 Ω.",
"= 48 W."
] | physics | Answer: Výkon: 48 W.
Steps:
1. P = I²×R.
2. P = (4 A)² × 3 Ω.
3. = 48 W. | electromagnetism |
Temperature is 297 K. | {
"A": "297 K",
"B": "296 K",
"C": "298 K",
"D": "299 K"
} | phy_0591 | multiple_choice | en | Room temperature is 24 °C. What is it in kelvin? | [
"24 °C + 273.",
"= 297 K.",
"Select option A."
] | physics | Answer: 297 K
Steps:
1. 24 °C + 273.
2. = 297 K.
3. Select option A.
Answer: (A) | thermodynamics |
Area scales light grasp, so giants see faintest galaxies. | null | phy_0592 | concept | en | Why big mirrors? | [
"Area scales light grasp, so giants see faintest galaxies.",
"So the answer stands: Area scales light grasp, so giants see faintest galaxies."
] | physics | Answer: Area scales light grasp, so giants see faintest galaxies.
Steps:
1. Area scales light grasp, so giants see faintest galaxies.
2. So the answer stands: Area scales light grasp, so giants see faintest galaxies. | optics |
Period is 0.17 s. | {
"A": "0.14 s",
"B": "0.17 s",
"C": "0.12 s",
"D": "0.2 s"
} | phy_0593 | multiple_choice | en | A wave has frequency 6 Hz. What is its period? | [
"T = 1 / 6 Hz.",
"T = 0.17 s.",
"Select option B."
] | physics | Answer: 0.17 s
Steps:
1. T = 1 / 6 Hz.
2. T = 0.17 s.
3. Select option B.
Answer: (B) | waves |
Count: 21. | {
"A": "20",
"B": "21",
"C": "22",
"D": "23"
} | phy_0594 | multiple_choice | en | An atom is excited to level n = 7. How many spectral lines can it emit? | [
"Pairs: 7×6/2.",
"Lines: 21.",
"Select option B."
] | physics | Answer: 21
Steps:
1. Pairs: 7×6/2.
2. Lines: 21.
3. Select option B.
Answer: (B) | modern |
Net force: 26 N. | null | phy_0595 | worked_example | en | A mass of 13 kg accelerates at 2 m/s². Compute the net force. | [
"F = m×a.",
"F = 13 kg × 2 m/s².",
"= 26 N."
] | physics | Answer: Net force: 26 N.
Steps:
1. F = m×a.
2. F = 13 kg × 2 m/s².
3. = 26 N. | mechanics |
Power is 84 W. | {
"A": "72 W",
"B": "84 W",
"C": "96 W",
"D": "108 W"
} | phy_0596 | multiple_choice | en | A bulb runs at 12 V drawing 7 A. What is its power? | [
"P = 12 V × 7 A.",
"P = 84 W.",
"Select option B."
] | physics | Answer: 84 W
Steps:
1. P = 12 V × 7 A.
2. P = 84 W.
3. Select option B.
Answer: (B) | electromagnetism |
Power: 160 W. | null | phy_0597 | worked_example | en | An engine does 1600 J of work in 10 s. Compute its power. | [
"P = W/t.",
"P = 1600 J / 10 s.",
"= 160 W."
] | physics | Answer: Power: 160 W.
Steps:
1. P = W/t.
2. P = 1600 J / 10 s.
3. = 160 W. | thermodynamics |
Time is 6 s. | {
"A": "7 s",
"B": "8 s",
"C": "6 s",
"D": "5 s"
} | phy_0598 | multiple_choice | en | Light travels 18×10⁸ m. How many seconds does it take? (c = 3×10⁸ m/s) | [
"t = 18×10⁸ m / 3×10⁸ m/s.",
"t = 6 s.",
"Select option C."
] | physics | Answer: 6 s
Steps:
1. t = 18×10⁸ m / 3×10⁸ m/s.
2. t = 6 s.
3. Select option C.
Answer: (C) | optics |
Speed: 2250 m/s. | null | phy_0599 | worked_example | en | A string wave has f = 750 Hz and λ = 3 m. Compute its speed. | [
"v = f×λ.",
"v = 750 Hz × 3 m.",
"= 2250 m/s."
] | physics | Answer: Speed: 2250 m/s.
Steps:
1. v = f×λ.
2. v = 750 Hz × 3 m.
3. = 2250 m/s. | waves |
Lines: 105. | null | phy_0600 | worked_example | en | An atom is excited to level n = 15. Count the spectral lines it can emit. | [
"Pairs: 15×14/2.",
"= 210/2.",
"= 105."
] | physics | Answer: Lines: 105.
Steps:
1. Pairs: 15×14/2.
2. = 210/2.
3. = 105. | modern |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.