answer string | choices dict | id string | kind string | lang string | question string | steps list | subject string | text string | topic string |
|---|---|---|---|---|---|---|---|---|---|
Momentum: 60 kg·m/s. | null | phy_0901 | worked_example | en | A mass of 20 kg moves at 3 m/s. Compute its momentum. | [
"p = m×v.",
"p = 20 kg × 3 m/s.",
"= 60 kg·m/s."
] | physics | Answer: Momentum: 60 kg·m/s.
Steps:
1. p = m×v.
2. p = 20 kg × 3 m/s.
3. = 60 kg·m/s. | mechanics |
Power is 132 W. | {
"A": "120 W",
"B": "132 W",
"C": "144 W",
"D": "156 W"
} | phy_0902 | multiple_choice | en | A bulb runs at 12 V drawing 11 A. What is its power? | [
"P = 12 V × 11 A.",
"P = 132 W.",
"Select option B."
] | physics | Answer: 132 W
Steps:
1. P = 12 V × 11 A.
2. P = 132 W.
3. Select option B.
Answer: (B) | electromagnetism |
Power: 200 W. | null | phy_0903 | worked_example | en | An engine does 2000 J of work in 10 s. Compute its power. | [
"P = W/t.",
"P = 2000 J / 10 s.",
"= 200 W."
] | physics | Answer: Power: 200 W.
Steps:
1. P = W/t.
2. P = 2000 J / 10 s.
3. = 200 W. | thermodynamics |
Missing cone types collapse hues, confusing reds with greens. | null | phy_0904 | concept | en | Why colour blindness? | [
"Missing cone types collapse hues, confusing reds with greens.",
"So the answer stands: Missing cone types collapse hues, confusing reds with greens."
] | physics | Answer: Missing cone types collapse hues, confusing reds with greens.
Steps:
1. Missing cone types collapse hues, confusing reds with greens.
2. So the answer stands: Missing cone types collapse hues, confusing reds with greens. | optics |
Speed: 3000 m/s. | null | phy_0905 | worked_example | en | A string wave has f = 1000 Hz and λ = 3 m. Compute its speed. | [
"v = f×λ.",
"v = 1000 Hz × 3 m.",
"= 3000 m/s."
] | physics | Answer: Speed: 3000 m/s.
Steps:
1. v = f×λ.
2. v = 1000 Hz × 3 m.
3. = 3000 m/s. | waves |
Nukleonové číslo: 13. | null | phy_0906 | worked_example | cs | Jádro má 6 protonů a 7 neutronů. Spočítej jeho nukleonové číslo. | [
"A = Z+N.",
"A = 6 + 7.",
"= 13."
] | physics | Answer: Nukleonové číslo: 13.
Steps:
1. A = Z+N.
2. A = 6 + 7.
3. = 13. | modern |
Net force: 38 N. | null | phy_0907 | worked_example | en | A mass of 19 kg accelerates at 2 m/s². Compute the net force. | [
"F = m×a.",
"F = 19 kg × 2 m/s².",
"= 38 N."
] | physics | Answer: Net force: 38 N.
Steps:
1. F = m×a.
2. F = 19 kg × 2 m/s².
3. = 38 N. | mechanics |
Charge is 200 C. | {
"A": "180 C",
"B": "220 C",
"C": "200 C",
"D": "240 C"
} | phy_0908 | multiple_choice | en | A current of 4 A flows for 50 s. How much charge passes? | [
"Q = 4 A × 50 s.",
"Q = 200 C.",
"Select option C."
] | physics | Answer: 200 C
Steps:
1. Q = 4 A × 50 s.
2. Q = 200 C.
3. Select option C.
Answer: (C) | electromagnetism |
Efficiency is 100%. | {
"A": "90%",
"B": "110%",
"C": "100%",
"D": "120%"
} | phy_0909 | multiple_choice | en | An engine turns 1000 J of 1000 J heat into work. What is its efficiency? | [
"1000 J / 1000 J.",
"= 100%.",
"Select option C."
] | physics | Answer: 100%
Steps:
1. 1000 J / 1000 J.
2. = 100%.
3. Select option C.
Answer: (C) | thermodynamics |
Time: 16.3 s. | null | phy_0910 | worked_example | en | Light travels 49×10⁸ m. Compute the travel time. (c = 3×10⁸ m/s) | [
"t = d/c.",
"t = 49×10⁸ / 3×10⁸ s.",
"= 16.3 s."
] | physics | Answer: Time: 16.3 s.
Steps:
1. t = d/c.
2. t = 49×10⁸ / 3×10⁸ s.
3. = 16.3 s. | optics |
3rd harmonic is 570 Hz. | {
"A": "540 Hz",
"B": "600 Hz",
"C": "570 Hz",
"D": "630 Hz"
} | phy_0911 | multiple_choice | en | A string's fundamental is 190 Hz. What is its 3rd harmonic? | [
"f3 = 3 × 190 Hz.",
"f3 = 570 Hz.",
"Select option C."
] | physics | Answer: 570 Hz
Steps:
1. f3 = 3 × 190 Hz.
2. f3 = 570 Hz.
3. Select option C.
Answer: (C) | waves |
Mass number is 16. | {
"A": "16",
"B": "15",
"C": "17",
"D": "18"
} | phy_0912 | multiple_choice | en | A nucleus has 8 protons and 8 neutrons. What is its mass number? | [
"A = 8 + 8.",
"A = 16.",
"Select option A."
] | physics | Answer: 16
Steps:
1. A = 8 + 8.
2. A = 16.
3. Select option A.
Answer: (A) | modern |
Surfaces push back perpendicularly exactly as needed, cancelling into-contact forces. | null | phy_0913 | concept | en | What is the normal force? | [
"Surfaces push back perpendicularly exactly as needed, cancelling into-contact forces.",
"So the answer stands: Surfaces push back perpendicularly exactly as needed, cancelling into-contact forces."
] | physics | Answer: Surfaces push back perpendicularly exactly as needed, cancelling into-contact forces.
Steps:
1. Surfaces push back perpendicularly exactly as needed, cancelling into-contact forces.
2. So the answer stands: Surfaces push back perpendicularly exactly as needed, cancelling into-contact forces. | mechanics |
Voltage: 204 V. | null | phy_0914 | worked_example | en | A current of 17 A flows through 12 Ω. Compute the voltage. | [
"V = I×R.",
"V = 17 A × 12 Ω.",
"= 204 V."
] | physics | Answer: Voltage: 204 V.
Steps:
1. V = I×R.
2. V = 17 A × 12 Ω.
3. = 204 V. | electromagnetism |
Beyond it liquid and gas merge indistinguishably into supercritical fluid. | null | phy_0915 | concept | en | What is critical point? | [
"Beyond it liquid and gas merge indistinguishably into supercritical fluid.",
"So the answer stands: Beyond it liquid and gas merge indistinguishably into supercritical fluid."
] | physics | Answer: Beyond it liquid and gas merge indistinguishably into supercritical fluid.
Steps:
1. Beyond it liquid and gas merge indistinguishably into supercritical fluid.
2. So the answer stands: Beyond it liquid and gas merge indistinguishably into supercritical fluid. | thermodynamics |
Rods sense dim light in grey, trading colour for sensitivity. | null | phy_0916 | concept | en | What is night vision? | [
"Rods sense dim light in grey, trading colour for sensitivity.",
"So the answer stands: Rods sense dim light in grey, trading colour for sensitivity."
] | physics | Answer: Rods sense dim light in grey, trading colour for sensitivity.
Steps:
1. Rods sense dim light in grey, trading colour for sensitivity.
2. So the answer stands: Rods sense dim light in grey, trading colour for sensitivity. | optics |
Light packets carry E = hf each, explaining spectra and solar cells. | null | phy_0917 | concept | en | Why photons? | [
"Light packets carry E = hf each, explaining spectra and solar cells.",
"So the answer stands: Light packets carry E = hf each, explaining spectra and solar cells."
] | physics | Answer: Light packets carry E = hf each, explaining spectra and solar cells.
Steps:
1. Light packets carry E = hf each, explaining spectra and solar cells.
2. So the answer stands: Light packets carry E = hf each, explaining spectra and solar cells. | waves |
Každé období půlí statisticky. | null | phy_0918 | concept | cs | Proč poločas? | [
"Každé období půlí statisticky.",
"Odpověď tedy platí: Každé období půlí statisticky."
] | physics | Answer: Každé období půlí statisticky.
Steps:
1. Každé období půlí statisticky.
2. Odpověď tedy platí: Každé období půlí statisticky. | modern |
Accelerating floors change scale readings, though gravity itself never varies. | null | phy_0919 | concept | en | Why apparent weight? | [
"Accelerating floors change scale readings, though gravity itself never varies.",
"So the answer stands: Accelerating floors change scale readings, though gravity itself never varies."
] | physics | Answer: Accelerating floors change scale readings, though gravity itself never varies.
Steps:
1. Accelerating floors change scale readings, though gravity itself never varies.
2. So the answer stands: Accelerating floors change scale readings, though gravity itself never varies. | mechanics |
Energy: 2100 J. | null | phy_0920 | worked_example | en | A 100 W heater runs for 21 s. Compute the energy used. | [
"E = P×t.",
"E = 100 W × 21 s.",
"= 2100 J."
] | physics | Answer: Energy: 2100 J.
Steps:
1. E = P×t.
2. E = 100 W × 21 s.
3. = 2100 J. | electromagnetism |
Temperature is 302 K. | {
"A": "301 K",
"B": "302 K",
"C": "303 K",
"D": "304 K"
} | phy_0921 | multiple_choice | en | Room temperature is 29 °C. What is it in kelvin? | [
"29 °C + 273.",
"= 302 K.",
"Select option B."
] | physics | Answer: 302 K
Steps:
1. 29 °C + 273.
2. = 302 K.
3. Select option B.
Answer: (B) | thermodynamics |
Apparent depth: 180 cm. | null | phy_0922 | worked_example | en | An object sits 270 cm deep in glass (n = 1.5). Compute the apparent depth. | [
"d' = d/n.",
"d' = 270 cm / 1.5.",
"= 180 cm."
] | physics | Answer: Apparent depth: 180 cm.
Steps:
1. d' = d/n.
2. d' = 270 cm / 1.5.
3. = 180 cm. | optics |
Distance: 6120 m. | null | phy_0923 | worked_example | en | Thunder is heard 18 s after lightning. How far away is the storm? (v = 340 m/s) | [
"d = v×t.",
"d = 340 m/s × 18 s.",
"= 6120 m."
] | physics | Answer: Distance: 6120 m.
Steps:
1. d = v×t.
2. d = 340 m/s × 18 s.
3. = 6120 m. | waves |
800 atoms remain. | {
"A": "750",
"B": "850",
"C": "900",
"D": "800"
} | phy_0924 | multiple_choice | en | A sample of 3200 atoms undergoes 2 half-lives. How many remain? | [
"Halve twice: 3200 → 1600 → 800.",
"Left: 800.",
"Select option D."
] | physics | Answer: 800
Steps:
1. Halve twice: 3200 → 1600 → 800.
2. Left: 800.
3. Select option D.
Answer: (D) | modern |
Work: 360 J. | null | phy_0925 | worked_example | en | A force of 90 N pushes 4 m. Compute the work done. | [
"W = F×d.",
"W = 90 N × 4 m.",
"= 360 J."
] | physics | Answer: Work: 360 J.
Steps:
1. W = F×d.
2. W = 90 N × 4 m.
3. = 360 J. | mechanics |
Měnící se tok budí napětí v cívkách. | null | phy_0926 | concept | cs | Co je indukce? | [
"Měnící se tok budí napětí v cívkách.",
"Odpověď tedy platí: Měnící se tok budí napětí v cívkách."
] | physics | Answer: Měnící se tok budí napětí v cívkách.
Steps:
1. Měnící se tok budí napětí v cívkách.
2. Odpověď tedy platí: Měnící se tok budí napětí v cívkách. | electromagnetism |
Jittering pollen proves molecules exist, kicked randomly by fluid hits. | null | phy_0927 | concept | en | Why Brownian motion? | [
"Jittering pollen proves molecules exist, kicked randomly by fluid hits.",
"So the answer stands: Jittering pollen proves molecules exist, kicked randomly by fluid hits."
] | physics | Answer: Jittering pollen proves molecules exist, kicked randomly by fluid hits.
Steps:
1. Jittering pollen proves molecules exist, kicked randomly by fluid hits.
2. So the answer stands: Jittering pollen proves molecules exist, kicked randomly by fluid hits. | thermodynamics |
Deforming mirrors cancel air shimmer live, sharpening star images. | null | phy_0928 | concept | en | Why adaptive optics? | [
"Deforming mirrors cancel air shimmer live, sharpening star images.",
"So the answer stands: Deforming mirrors cancel air shimmer live, sharpening star images."
] | physics | Answer: Deforming mirrors cancel air shimmer live, sharpening star images.
Steps:
1. Deforming mirrors cancel air shimmer live, sharpening star images.
2. So the answer stands: Deforming mirrors cancel air shimmer live, sharpening star images. | optics |
3rd harmonic: 780 Hz. | null | phy_0929 | worked_example | en | A string's fundamental is 260 Hz. Compute its 3rd harmonic. | [
"f3 = 3×f1.",
"f3 = 3 × 260 Hz.",
"= 780 Hz."
] | physics | Answer: 3rd harmonic: 780 Hz.
Steps:
1. f3 = 3×f1.
2. f3 = 3 × 260 Hz.
3. = 780 Hz. | waves |
Count: 45. | {
"A": "45",
"B": "44",
"C": "46",
"D": "47"
} | phy_0930 | multiple_choice | en | An atom is excited to level n = 10. How many spectral lines can it emit? | [
"Pairs: 10×9/2.",
"Lines: 45.",
"Select option A."
] | physics | Answer: 45
Steps:
1. Pairs: 10×9/2.
2. Lines: 45.
3. Select option A.
Answer: (A) | modern |
Moment je síla krát rameno a roztáčí tělesa. | null | phy_0931 | concept | cs | Proč moment síly? | [
"Moment je síla krát rameno a roztáčí tělesa.",
"Odpověď tedy platí: Moment je síla krát rameno a roztáčí tělesa."
] | physics | Answer: Moment je síla krát rameno a roztáčí tělesa.
Steps:
1. Moment je síla krát rameno a roztáčí tělesa.
2. Odpověď tedy platí: Moment je síla krát rameno a roztáčí tělesa. | mechanics |
Metal braids block interference, keeping signals clean in noise. | null | phy_0932 | concept | en | Why shield cables? | [
"Metal braids block interference, keeping signals clean in noise.",
"So the answer stands: Metal braids block interference, keeping signals clean in noise."
] | physics | Answer: Metal braids block interference, keeping signals clean in noise.
Steps:
1. Metal braids block interference, keeping signals clean in noise.
2. So the answer stands: Metal braids block interference, keeping signals clean in noise. | electromagnetism |
Particles spread from crowded to empty randomly, mixing air and ink. | null | phy_0933 | concept | en | What is diffusion? | [
"Particles spread from crowded to empty randomly, mixing air and ink.",
"So the answer stands: Particles spread from crowded to empty randomly, mixing air and ink."
] | physics | Answer: Particles spread from crowded to empty randomly, mixing air and ink.
Steps:
1. Particles spread from crowded to empty randomly, mixing air and ink.
2. So the answer stands: Particles spread from crowded to empty randomly, mixing air and ink. | thermodynamics |
c is 299792458 m/s exactly, the cosmic limit nothing exceeds. | null | phy_0934 | concept | en | What is the speed of light? | [
"c is 299792458 m/s exactly, the cosmic limit nothing exceeds.",
"So the answer stands: c is 299792458 m/s exactly, the cosmic limit nothing exceeds."
] | physics | Answer: c is 299792458 m/s exactly, the cosmic limit nothing exceeds.
Steps:
1. c is 299792458 m/s exactly, the cosmic limit nothing exceeds.
2. So the answer stands: c is 299792458 m/s exactly, the cosmic limit nothing exceeds. | optics |
Speed: 3150 m/s. | null | phy_0935 | worked_example | en | A string wave has f = 1050 Hz and λ = 3 m. Compute its speed. | [
"v = f×λ.",
"v = 1050 Hz × 3 m.",
"= 3150 m/s."
] | physics | Answer: Speed: 3150 m/s.
Steps:
1. v = f×λ.
2. v = 1050 Hz × 3 m.
3. = 3150 m/s. | waves |
Mass number is 18. | {
"A": "17",
"B": "18",
"C": "19",
"D": "20"
} | phy_0936 | multiple_choice | en | A nucleus has 9 protons and 9 neutrons. What is its mass number? | [
"A = 9 + 9.",
"A = 18.",
"Select option B."
] | physics | Answer: 18
Steps:
1. A = 9 + 9.
2. A = 18.
3. Select option B.
Answer: (B) | modern |
Pulleys redirect tension and share loads, trading pull distance for force ease. | null | phy_0937 | concept | en | What is a pulley for? | [
"Pulleys redirect tension and share loads, trading pull distance for force ease.",
"So the answer stands: Pulleys redirect tension and share loads, trading pull distance for force ease."
] | physics | Answer: Pulleys redirect tension and share loads, trading pull distance for force ease.
Steps:
1. Pulleys redirect tension and share loads, trading pull distance for force ease.
2. So the answer stands: Pulleys redirect tension and share loads, trading pull distance for force ease. | mechanics |
Separated charges reunite suddenly through air, zapping fingers dryly. | null | phy_0938 | concept | en | What is static shock? | [
"Separated charges reunite suddenly through air, zapping fingers dryly.",
"So the answer stands: Separated charges reunite suddenly through air, zapping fingers dryly."
] | physics | Answer: Separated charges reunite suddenly through air, zapping fingers dryly.
Steps:
1. Separated charges reunite suddenly through air, zapping fingers dryly.
2. So the answer stands: Separated charges reunite suddenly through air, zapping fingers dryly. | electromagnetism |
Temperature: 304 K. | null | phy_0939 | worked_example | en | Temperature is 31 °C. Convert it to kelvin. | [
"Add 273.",
"31 + 273.",
"= 304 K."
] | physics | Answer: Temperature: 304 K.
Steps:
1. Add 273.
2. 31 + 273.
3. = 304 K. | thermodynamics |
Relativity holds light speed fixed for all observers, warping time itself. | null | phy_0940 | concept | en | Why constant c? | [
"Relativity holds light speed fixed for all observers, warping time itself.",
"So the answer stands: Relativity holds light speed fixed for all observers, warping time itself."
] | physics | Answer: Relativity holds light speed fixed for all observers, warping time itself.
Steps:
1. Relativity holds light speed fixed for all observers, warping time itself.
2. So the answer stands: Relativity holds light speed fixed for all observers, warping time itself. | optics |
Speed is 1100 m/s. | {
"A": "1050 m/s",
"B": "1100 m/s",
"C": "1150 m/s",
"D": "1200 m/s"
} | phy_0941 | multiple_choice | en | A string wave has f = 550 Hz and λ = 2 m. What is its speed? | [
"v = 550 Hz × 2 m.",
"v = 1100 m/s.",
"Select option B."
] | physics | Answer: 1100 m/s
Steps:
1. v = 550 Hz × 2 m.
2. v = 1100 m/s.
3. Select option B.
Answer: (B) | waves |
900 atoms remain. | {
"A": "900",
"B": "850",
"C": "950",
"D": "1000"
} | phy_0942 | multiple_choice | en | A sample of 3600 atoms undergoes 2 half-lives. How many remain? | [
"Halve twice: 3600 → 1800 → 900.",
"Left: 900.",
"Select option A."
] | physics | Answer: 900
Steps:
1. Halve twice: 3600 → 1800 → 900.
2. Left: 900.
3. Select option A.
Answer: (A) | modern |
Momentum: 63 kg·m/s. | null | phy_0943 | worked_example | en | A mass of 21 kg moves at 3 m/s. Compute its momentum. | [
"p = m×v.",
"p = 21 kg × 3 m/s.",
"= 63 kg·m/s."
] | physics | Answer: Momentum: 63 kg·m/s.
Steps:
1. p = m×v.
2. p = 21 kg × 3 m/s.
3. = 63 kg·m/s. | mechanics |
It powers civilization from lights to chips, unifying forces elegantly. | null | phy_0944 | concept | en | Why study electromagnetism? | [
"It powers civilization from lights to chips, unifying forces elegantly.",
"So the answer stands: It powers civilization from lights to chips, unifying forces elegantly."
] | physics | Answer: It powers civilization from lights to chips, unifying forces elegantly.
Steps:
1. It powers civilization from lights to chips, unifying forces elegantly.
2. So the answer stands: It powers civilization from lights to chips, unifying forces elegantly. | electromagnetism |
Teplo: 41860 J. | null | phy_0945 | worked_example | cs | Kolik tepla ohřeje 2 kg vody o 5 K? (c = 4186 J/(kg·K)) | [
"Q = 2 kg × 4186 J/(kg·K) × 5 K.",
"= 41860 J."
] | physics | Answer: Teplo: 41860 J.
Steps:
1. Q = 2 kg × 4186 J/(kg·K) × 5 K.
2. = 41860 J. | thermodynamics |
Magnification: 19×. | null | phy_0946 | worked_example | en | An image forms 190 cm from a lens, object at 10 cm. Compute the magnification. | [
"M = di/do.",
"M = 190 cm / 10 cm.",
"= 19×."
] | physics | Answer: Magnification: 19×.
Steps:
1. M = di/do.
2. M = 190 cm / 10 cm.
3. = 19×. | optics |
3. harmonická: 390 Hz. | null | phy_0947 | worked_example | cs | Základ struny je 130 Hz. Spočítej její 3. harmonickou. | [
"f3 = 3×f1.",
"f3 = 3 × 130 Hz.",
"= 390 Hz."
] | physics | Answer: 3. harmonická: 390 Hz.
Steps:
1. f3 = 3×f1.
2. f3 = 3 × 130 Hz.
3. = 390 Hz. | waves |
Count: 55. | {
"A": "54",
"B": "55",
"C": "56",
"D": "57"
} | phy_0948 | multiple_choice | en | An atom is excited to level n = 11. How many spectral lines can it emit? | [
"Pairs: 11×10/2.",
"Lines: 55.",
"Select option B."
] | physics | Answer: 55
Steps:
1. Pairs: 11×10/2.
2. Lines: 55.
3. Select option B.
Answer: (B) | modern |
Net force: 40 N. | null | phy_0949 | worked_example | en | A mass of 20 kg accelerates at 2 m/s². Compute the net force. | [
"F = m×a.",
"F = 20 kg × 2 m/s².",
"= 40 N."
] | physics | Answer: Net force: 40 N.
Steps:
1. F = m×a.
2. F = 20 kg × 2 m/s².
3. = 40 N. | mechanics |
Power: 972 W. | null | phy_0950 | worked_example | en | A current of 18 A flows through 3 Ω. Compute the dissipated power. | [
"P = I²×R.",
"P = (18 A)² × 3 Ω.",
"= 972 W."
] | physics | Answer: Power: 972 W.
Steps:
1. P = I²×R.
2. P = (18 A)² × 3 Ω.
3. = 972 W. | electromagnetism |
Heat needed is 46046 J. | {
"A": "41860 J",
"B": "50232 J",
"C": "46046 J",
"D": "54418 J"
} | phy_0951 | multiple_choice | en | How much heat warms 1 kg of water by 11 K? (c = 4186 J/(kg·K)) | [
"Q = 1 kg × 4186 J/(kg·K) × 11 K.",
"Q = 46046 J.",
"Select option C."
] | physics | Answer: 46046 J
Steps:
1. Q = 1 kg × 4186 J/(kg·K) × 11 K.
2. Q = 46046 J.
3. Select option C.
Answer: (C) | thermodynamics |
Zvětšení: 7×. | null | phy_0952 | worked_example | cs | Obraz vzniká 70 cm od čočky, předmět v 10 cm. Spočítej zvětšení. | [
"M = di/do.",
"M = 70 cm / 10 cm.",
"= 7×."
] | physics | Answer: Zvětšení: 7×.
Steps:
1. M = di/do.
2. M = 70 cm / 10 cm.
3. = 7×. | optics |
Everything shows both wave and particle faces in experiments. | null | phy_0953 | concept | en | What is wave-particle duality? | [
"Everything shows both wave and particle faces in experiments.",
"So the answer stands: Everything shows both wave and particle faces in experiments."
] | physics | Answer: Everything shows both wave and particle faces in experiments.
Steps:
1. Everything shows both wave and particle faces in experiments.
2. So the answer stands: Everything shows both wave and particle faces in experiments. | waves |
Odpověď je fúze. | {
"A": "zmatek",
"B": "fúze",
"C": "difuze",
"D": "iluze"
} | phy_0954 | multiple_choice | cs | Vyber: co slučuje lehké? | [
"Hvězdy rozsvíceny.",
"Tedy: fúze.",
"Vyber možnost B."
] | physics | Answer: fúze
Steps:
1. Hvězdy rozsvíceny.
2. Tedy: fúze.
3. Vyber možnost B.
Answer: (B) | modern |
Work: 380 J. | null | phy_0955 | worked_example | en | A force of 95 N pushes 4 m. Compute the work done. | [
"W = F×d.",
"W = 95 N × 4 m.",
"= 380 J."
] | physics | Answer: Work: 380 J.
Steps:
1. W = F×d.
2. W = 95 N × 4 m.
3. = 380 J. | mechanics |
Voltage: 216 V. | null | phy_0956 | worked_example | en | A current of 18 A flows through 12 Ω. Compute the voltage. | [
"V = I×R.",
"V = 18 A × 12 Ω.",
"= 216 V."
] | physics | Answer: Voltage: 216 V.
Steps:
1. V = I×R.
2. V = 18 A × 12 Ω.
3. = 216 V. | electromagnetism |
Heat: 142324 J. | null | phy_0957 | worked_example | en | How much heat warms 2 kg of water by 17 K? (c = 4186 J/(kg·K)) | [
"Q = 2 kg × 4186 J/(kg·K) × 17 K.",
"= 142324 J."
] | physics | Answer: Heat: 142324 J.
Steps:
1. Q = 2 kg × 4186 J/(kg·K) × 17 K.
2. = 142324 J. | thermodynamics |
Stretching space lengthens light waves, revealing cosmic expansion. | null | phy_0958 | concept | en | What is redshift? | [
"Stretching space lengthens light waves, revealing cosmic expansion.",
"So the answer stands: Stretching space lengthens light waves, revealing cosmic expansion."
] | physics | Answer: Stretching space lengthens light waves, revealing cosmic expansion.
Steps:
1. Stretching space lengthens light waves, revealing cosmic expansion.
2. So the answer stands: Stretching space lengthens light waves, revealing cosmic expansion. | optics |
Distance: 6460 m. | null | phy_0959 | worked_example | en | Thunder is heard 19 s after lightning. How far away is the storm? (v = 340 m/s) | [
"d = v×t.",
"d = 340 m/s × 19 s.",
"= 6460 m."
] | physics | Answer: Distance: 6460 m.
Steps:
1. d = v×t.
2. d = 340 m/s × 19 s.
3. = 6460 m. | waves |
It models particles as tiny vibrating strings unifying forces. | null | phy_0960 | concept | en | What is string theory? | [
"It models particles as tiny vibrating strings unifying forces.",
"So the answer stands: It models particles as tiny vibrating strings unifying forces."
] | physics | Answer: It models particles as tiny vibrating strings unifying forces.
Steps:
1. It models particles as tiny vibrating strings unifying forces.
2. So the answer stands: It models particles as tiny vibrating strings unifying forces. | modern |
Meshed teeth trade speed for torque at fixed ratios, powering machines efficiently. | null | phy_0961 | concept | en | Why gears? | [
"Meshed teeth trade speed for torque at fixed ratios, powering machines efficiently.",
"So the answer stands: Meshed teeth trade speed for torque at fixed ratios, powering machines efficiently."
] | physics | Answer: Meshed teeth trade speed for torque at fixed ratios, powering machines efficiently.
Steps:
1. Meshed teeth trade speed for torque at fixed ratios, powering machines efficiently.
2. So the answer stands: Meshed teeth trade speed for torque at fixed ratios, powering machines efficiently. | mechanics |
Voltage is 55 V. | {
"A": "50 V",
"B": "55 V",
"C": "60 V",
"D": "65 V"
} | phy_0962 | multiple_choice | en | A current of 11 A flows through 5 Ω. What is the voltage? | [
"V = 11 A × 5 Ω.",
"V = 55 V.",
"Select option B."
] | physics | Answer: 55 V
Steps:
1. V = 11 A × 5 Ω.
2. V = 55 V.
3. Select option B.
Answer: (B) | electromagnetism |
Power: 210 W. | null | phy_0963 | worked_example | en | An engine does 2100 J of work in 10 s. Compute its power. | [
"P = W/t.",
"P = 2100 J / 10 s.",
"= 210 W."
] | physics | Answer: Power: 210 W.
Steps:
1. P = W/t.
2. P = 2100 J / 10 s.
3. = 210 W. | thermodynamics |
Čas: 5,3 s. | null | phy_0964 | worked_example | cs | Světlo letí 16×10⁸ m. Spočítej dobu letu. (c = 3×10⁸ m/s) | [
"t = d/c.",
"t = 16×10⁸ / 3×10⁸ s.",
"= 5,3 s."
] | physics | Answer: Čas: 5,3 s.
Steps:
1. t = d/c.
2. t = 16×10⁸ / 3×10⁸ s.
3. = 5,3 s. | optics |
Period is 0.09 s. | {
"A": "0.1 s",
"B": "0.11 s",
"C": "0.09 s",
"D": "0.08 s"
} | phy_0965 | multiple_choice | en | A wave has frequency 11 Hz. What is its period? | [
"T = 1 / 11 Hz.",
"T = 0.09 s.",
"Select option C."
] | physics | Answer: 0.09 s
Steps:
1. T = 1 / 11 Hz.
2. T = 0.09 s.
3. Select option C.
Answer: (C) | waves |
Mass number is 20. | {
"A": "19",
"B": "21",
"C": "20",
"D": "22"
} | phy_0966 | multiple_choice | en | A nucleus has 10 protons and 10 neutrons. What is its mass number? | [
"A = 10 + 10.",
"A = 20.",
"Select option C."
] | physics | Answer: 20
Steps:
1. A = 10 + 10.
2. A = 20.
3. Select option C.
Answer: (C) | modern |
It is the balance point moving as if all mass sat there under net force. | null | phy_0967 | concept | en | What is the centre of mass? | [
"It is the balance point moving as if all mass sat there under net force.",
"So the answer stands: It is the balance point moving as if all mass sat there under net force."
] | physics | Answer: It is the balance point moving as if all mass sat there under net force.
Steps:
1. It is the balance point moving as if all mass sat there under net force.
2. So the answer stands: It is the balance point moving as if all mass sat there under net force. | mechanics |
Power is 144 W. | {
"A": "132 W",
"B": "156 W",
"C": "144 W",
"D": "168 W"
} | phy_0968 | multiple_choice | en | A bulb runs at 12 V drawing 12 A. What is its power? | [
"P = 12 V × 12 A.",
"P = 144 W.",
"Select option C."
] | physics | Answer: 144 W
Steps:
1. P = 12 V × 12 A.
2. P = 144 W.
3. Select option C.
Answer: (C) | electromagnetism |
Efficiency is 110%. | {
"A": "100%",
"B": "120%",
"C": "130%",
"D": "110%"
} | phy_0969 | multiple_choice | en | An engine turns 1100 J of 1000 J heat into work. What is its efficiency? | [
"1100 J / 1000 J.",
"= 110%.",
"Select option D."
] | physics | Answer: 110%
Steps:
1. 1100 J / 1000 J.
2. = 110%.
3. Select option D.
Answer: (D) | thermodynamics |
Time: 17.3 s. | null | phy_0970 | worked_example | en | Light travels 52×10⁸ m. Compute the travel time. (c = 3×10⁸ m/s) | [
"t = d/c.",
"t = 52×10⁸ / 3×10⁸ s.",
"= 17.3 s."
] | physics | Answer: Time: 17.3 s.
Steps:
1. t = d/c.
2. t = 52×10⁸ / 3×10⁸ s.
3. = 17.3 s. | optics |
3rd harmonic: 810 Hz. | null | phy_0971 | worked_example | en | A string's fundamental is 270 Hz. Compute its 3rd harmonic. | [
"f3 = 3×f1.",
"f3 = 3 × 270 Hz.",
"= 810 Hz."
] | physics | Answer: 3rd harmonic: 810 Hz.
Steps:
1. f3 = 3×f1.
2. f3 = 3 × 270 Hz.
3. = 810 Hz. | waves |
It reveals deep reality from quanta to cosmos. | null | phy_0972 | concept | en | Why study modern physics? | [
"It reveals deep reality from quanta to cosmos.",
"So the answer stands: It reveals deep reality from quanta to cosmos."
] | physics | Answer: It reveals deep reality from quanta to cosmos.
Steps:
1. It reveals deep reality from quanta to cosmos.
2. So the answer stands: It reveals deep reality from quanta to cosmos. | modern |
Speed is 19 m/s. | {
"A": "18 m/s",
"B": "20 m/s",
"C": "19 m/s",
"D": "21 m/s"
} | phy_0973 | multiple_choice | en | A car travels 190 m in 10 s. What is its speed? | [
"v = 190 m / 10 s.",
"v = 19 m/s.",
"Select option C."
] | physics | Answer: 19 m/s
Steps:
1. v = 190 m / 10 s.
2. v = 19 m/s.
3. Select option C.
Answer: (C) | mechanics |
Energy: 2200 J. | null | phy_0974 | worked_example | en | A 100 W heater runs for 22 s. Compute the energy used. | [
"E = P×t.",
"E = 100 W × 22 s.",
"= 2200 J."
] | physics | Answer: Energy: 2200 J.
Steps:
1. E = P×t.
2. E = 100 W × 22 s.
3. = 2200 J. | electromagnetism |
Solvent crosses membranes toward solute, pressuring cells and roots. | null | phy_0975 | concept | en | Why osmosis? | [
"Solvent crosses membranes toward solute, pressuring cells and roots.",
"So the answer stands: Solvent crosses membranes toward solute, pressuring cells and roots."
] | physics | Answer: Solvent crosses membranes toward solute, pressuring cells and roots.
Steps:
1. Solvent crosses membranes toward solute, pressuring cells and roots.
2. So the answer stands: Solvent crosses membranes toward solute, pressuring cells and roots. | thermodynamics |
Apparent depth: 190 cm. | null | phy_0976 | worked_example | en | An object sits 285 cm deep in glass (n = 1.5). Compute the apparent depth. | [
"d' = d/n.",
"d' = 285 cm / 1.5.",
"= 190 cm."
] | physics | Answer: Apparent depth: 190 cm.
Steps:
1. d' = d/n.
2. d' = 285 cm / 1.5.
3. = 190 cm. | optics |
Matter wavelength h/p guides electron microscopes to atoms. | null | phy_0977 | concept | en | Why de Broglie? | [
"Matter wavelength h/p guides electron microscopes to atoms.",
"So the answer stands: Matter wavelength h/p guides electron microscopes to atoms."
] | physics | Answer: Matter wavelength h/p guides electron microscopes to atoms.
Steps:
1. Matter wavelength h/p guides electron microscopes to atoms.
2. So the answer stands: Matter wavelength h/p guides electron microscopes to atoms. | waves |
Mass number: 41. | null | phy_0978 | worked_example | en | A nucleus has 20 protons and 21 neutrons. Compute its mass number. | [
"A = Z+N.",
"A = 20 + 21.",
"= 41."
] | physics | Answer: Mass number: 41.
Steps:
1. A = Z+N.
2. A = 20 + 21.
3. = 41. | modern |
It predicts all motion from atoms to galaxies, the foundation of physics. | null | phy_0979 | concept | en | Why study mechanics? | [
"It predicts all motion from atoms to galaxies, the foundation of physics.",
"So the answer stands: It predicts all motion from atoms to galaxies, the foundation of physics."
] | physics | Answer: It predicts all motion from atoms to galaxies, the foundation of physics.
Steps:
1. It predicts all motion from atoms to galaxies, the foundation of physics.
2. So the answer stands: It predicts all motion from atoms to galaxies, the foundation of physics. | mechanics |
Odpověď je napětí. | {
"A": "napětí",
"B": "proud",
"C": "výkon",
"D": "síla"
} | phy_0980 | multiple_choice | cs | Vyber: co je energie na náboj? | [
"Volty tlačí tok.",
"Tedy: napětí.",
"Vyber možnost A."
] | physics | Answer: napětí
Steps:
1. Volty tlačí tok.
2. Tedy: napětí.
3. Vyber možnost A.
Answer: (A) | electromagnetism |
Molecular speeds spread predictably around most-likely values by temperature. | null | phy_0981 | concept | en | What is Maxwell distribution? | [
"Molecular speeds spread predictably around most-likely values by temperature.",
"So the answer stands: Molecular speeds spread predictably around most-likely values by temperature."
] | physics | Answer: Molecular speeds spread predictably around most-likely values by temperature.
Steps:
1. Molecular speeds spread predictably around most-likely values by temperature.
2. So the answer stands: Molecular speeds spread predictably around most-likely values by temperature. | thermodynamics |
Apparent depth is 110 cm. | {
"A": "105 cm",
"B": "115 cm",
"C": "120 cm",
"D": "110 cm"
} | phy_0982 | multiple_choice | en | An object sits 165 cm deep in glass (n = 1.5). What is the apparent depth? | [
"d' = 165 cm / 1.5.",
"d' = 110 cm.",
"Select option D."
] | physics | Answer: 110 cm
Steps:
1. d' = 165 cm / 1.5.
2. d' = 110 cm.
3. Select option D.
Answer: (D) | optics |
Position-momentum spread has a quantum floor, blurring tiny scales. | null | phy_0983 | concept | en | What is uncertainty? | [
"Position-momentum spread has a quantum floor, blurring tiny scales.",
"So the answer stands: Position-momentum spread has a quantum floor, blurring tiny scales."
] | physics | Answer: Position-momentum spread has a quantum floor, blurring tiny scales.
Steps:
1. Position-momentum spread has a quantum floor, blurring tiny scales.
2. So the answer stands: Position-momentum spread has a quantum floor, blurring tiny scales. | waves |
1000 atoms remain. | {
"A": "950",
"B": "1000",
"C": "1050",
"D": "1100"
} | phy_0984 | multiple_choice | en | A sample of 4000 atoms undergoes 2 half-lives. How many remain? | [
"Halve twice: 4000 → 2000 → 1000.",
"Left: 1000.",
"Select option B."
] | physics | Answer: 1000
Steps:
1. Halve twice: 4000 → 2000 → 1000.
2. Left: 1000.
3. Select option B.
Answer: (B) | modern |
Práce: 120 J. | null | phy_0985 | worked_example | cs | Síla 30 N tlačí na dráze 4 m. Spočítej vykonanou práci. | [
"W = F×d.",
"W = 30 N × 4 m.",
"= 120 J."
] | physics | Answer: Práce: 120 J.
Steps:
1. W = F×d.
2. W = 30 N × 4 m.
3. = 120 J. | mechanics |
Odpověď je transformátor. | {
"A": "motor",
"B": "transformátor",
"C": "baterie",
"D": "pojistka"
} | phy_0986 | multiple_choice | cs | Vyber: co škáluje závity? | [
"Napětí poměřeno.",
"Tedy: transformátor.",
"Vyber možnost B."
] | physics | Answer: transformátor
Steps:
1. Napětí poměřeno.
2. Tedy: transformátor.
3. Vyber možnost B.
Answer: (B) | electromagnetism |
Temperature: 305 K. | null | phy_0987 | worked_example | en | Temperature is 32 °C. Convert it to kelvin. | [
"Add 273.",
"32 + 273.",
"= 305 K."
] | physics | Answer: Temperature: 305 K.
Steps:
1. Add 273.
2. 32 + 273.
3. = 305 K. | thermodynamics |
Magnification: 20×. | null | phy_0988 | worked_example | en | An image forms 200 cm from a lens, object at 10 cm. Compute the magnification. | [
"M = di/do.",
"M = 200 cm / 10 cm.",
"= 20×."
] | physics | Answer: Magnification: 20×.
Steps:
1. M = di/do.
2. M = 200 cm / 10 cm.
3. = 20×. | optics |
3rd harmonic is 600 Hz. | {
"A": "570 Hz",
"B": "630 Hz",
"C": "660 Hz",
"D": "600 Hz"
} | phy_0989 | multiple_choice | en | A string's fundamental is 200 Hz. What is its 3rd harmonic? | [
"f3 = 3 × 200 Hz.",
"f3 = 600 Hz.",
"Select option D."
] | physics | Answer: 600 Hz
Steps:
1. f3 = 3 × 200 Hz.
2. f3 = 600 Hz.
3. Select option D.
Answer: (D) | waves |
Count: 66. | {
"A": "65",
"B": "67",
"C": "66",
"D": "68"
} | phy_0990 | multiple_choice | en | An atom is excited to level n = 12. How many spectral lines can it emit? | [
"Pairs: 12×11/2.",
"Lines: 66.",
"Select option C."
] | physics | Answer: 66
Steps:
1. Pairs: 12×11/2.
2. Lines: 66.
3. Select option C.
Answer: (C) | modern |
Kinetic energy is 169 J. | {
"A": "156 J",
"B": "182 J",
"C": "195 J",
"D": "169 J"
} | phy_0991 | multiple_choice | en | A 2 kg ball moves at 13 m/s. What is its kinetic energy? | [
"KE = ½×2 kg×(13 m/s)².",
"KE = 169 J.",
"Select option D."
] | physics | Answer: 169 J
Steps:
1. KE = ½×2 kg×(13 m/s)².
2. KE = 169 J.
3. Select option D.
Answer: (D) | mechanics |
Energie: 900 J. | null | phy_0992 | worked_example | cs | Topidlo 100 W běží po 9 s. Spočítej spotřebovanou energii. | [
"E = P×t.",
"E = 100 W × 9 s.",
"= 900 J."
] | physics | Answer: Energie: 900 J.
Steps:
1. E = P×t.
2. E = 100 W × 9 s.
3. = 900 J. | electromagnetism |
Heat: 150696 J. | null | phy_0993 | worked_example | en | How much heat warms 2 kg of water by 18 K? (c = 4186 J/(kg·K)) | [
"Q = 2 kg × 4186 J/(kg·K) × 18 K.",
"= 150696 J."
] | physics | Answer: Heat: 150696 J.
Steps:
1. Q = 2 kg × 4186 J/(kg·K) × 18 K.
2. = 150696 J. | thermodynamics |
It explains sight, cameras, and cosmos through light's behaviour. | null | phy_0994 | concept | en | Why study optics? | [
"It explains sight, cameras, and cosmos through light's behaviour.",
"So the answer stands: It explains sight, cameras, and cosmos through light's behaviour."
] | physics | Answer: It explains sight, cameras, and cosmos through light's behaviour.
Steps:
1. It explains sight, cameras, and cosmos through light's behaviour.
2. So the answer stands: It explains sight, cameras, and cosmos through light's behaviour. | optics |
Waves explain sound, light, and quantum all at once. | null | phy_0995 | concept | en | Why study waves? | [
"Waves explain sound, light, and quantum all at once.",
"So the answer stands: Waves explain sound, light, and quantum all at once."
] | physics | Answer: Waves explain sound, light, and quantum all at once.
Steps:
1. Waves explain sound, light, and quantum all at once.
2. So the answer stands: Waves explain sound, light, and quantum all at once. | waves |
Mass number is 22. | {
"A": "21",
"B": "23",
"C": "24",
"D": "22"
} | phy_0996 | multiple_choice | en | A nucleus has 11 protons and 11 neutrons. What is its mass number? | [
"A = 11 + 11.",
"A = 22.",
"Select option D."
] | physics | Answer: 22
Steps:
1. A = 11 + 11.
2. A = 22.
3. Select option D.
Answer: (D) | modern |
Odpověď je práce. | {
"A": "výkon",
"B": "práce",
"C": "moment",
"D": "impuls"
} | phy_0997 | multiple_choice | cs | Vyber: co je síla krát dráha? | [
"Jouly sečteny.",
"Tedy: práce.",
"Vyber možnost B."
] | physics | Answer: práce
Steps:
1. Jouly sečteny.
2. Tedy: práce.
3. Vyber možnost B.
Answer: (B) | mechanics |
Charge is 220 C. | {
"A": "200 C",
"B": "240 C",
"C": "260 C",
"D": "220 C"
} | phy_0998 | multiple_choice | en | A current of 4 A flows for 55 s. How much charge passes? | [
"Q = 4 A × 55 s.",
"Q = 220 C.",
"Select option D."
] | physics | Answer: 220 C
Steps:
1. Q = 4 A × 55 s.
2. Q = 220 C.
3. Select option D.
Answer: (D) | electromagnetism |
It rules engines, life, and cosmos through energy and entropy laws. | null | phy_0999 | concept | en | Why study thermodynamics? | [
"It rules engines, life, and cosmos through energy and entropy laws.",
"So the answer stands: It rules engines, life, and cosmos through energy and entropy laws."
] | physics | Answer: It rules engines, life, and cosmos through energy and entropy laws.
Steps:
1. It rules engines, life, and cosmos through energy and entropy laws.
2. So the answer stands: It rules engines, life, and cosmos through energy and entropy laws. | thermodynamics |
Time: 18.3 s. | null | phy_1000 | worked_example | en | Light travels 55×10⁸ m. Compute the travel time. (c = 3×10⁸ m/s) | [
"t = d/c.",
"t = 55×10⁸ / 3×10⁸ s.",
"= 18.3 s."
] | physics | Answer: Time: 18.3 s.
Steps:
1. t = d/c.
2. t = 55×10⁸ / 3×10⁸ s.
3. = 18.3 s. | optics |
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