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Physics · Question 841
When a body in stable equilibrium is slightly displaced and released:
It returns toward equilibrium
Its potential energy increases when displaced
Its weight line remains within the base
All of these
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Correct answer: D
All of these
The printed worksheet key marks D (All of these) as the correct answer.
Physics · Question 842
The rate of change of angular momentum is equal to:
Linear momentum
Force
Torque
None of these
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Correct answer: C
Torque
The printed worksheet key marks C (Torque) as the correct answer.
Physics · Question 843
Angular momentum changes from 100 J·s to 300 J·s in 2 s. What average torque acts?
100 N·m
300 N·m
150 N·m
0 N·m
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Correct answer: A
100 N·m
The printed worksheet key marks A (100 N·m) as the correct answer.
Physics · Question 844
A 30 cm uniform rod is pivoted at its centre. A 40 N weight hangs 5 cm from the left end. Where should a 50 N weight hang to balance it?
5 cm from the right end
7 cm from the right end
6 cm from the right end
8 cm from the right end
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Correct answer: B
7 cm from the right end
The printed worksheet key marks B (7 cm from the right end) as the correct answer.
Physics · Question 845
Four particles have the same kinetic energy. Which has the greatest momentum?
Proton
Electron
Positron
α-particle
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Correct answer: D
α-particle
The printed worksheet key marks D (α-particle) as the correct answer.
Physics · Question 846
What power is needed to lift 100 kg of water through 100 m in 5 s, using g = 10 m/s²?
20 kW
200 kW
40 kW
4 kW
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Correct answer: A
20 kW
The printed worksheet key marks A (20 kW) as the correct answer.
Physics · Question 847
One megawatt-hour is equal to:
3.6 × 10⁸ J
3.6 J
3.6 MJ
3.6 × 10⁹ J
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Correct answer: D
3.6 × 10⁹ J
The printed worksheet key marks D (3.6 × 10⁹ J) as the correct answer.
Physics · Question 848
Which listed quantity is a valid unit of potential energy?
eV
calorie
joule
All of these
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Correct answer: D
All of these
The printed worksheet key marks D (All of these) as the correct answer.
Physics · Question 849
The slope of an energy-versus-time graph represents:
Acceleration
Momentum
Power
Work
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Correct answer: C
Power
The printed worksheet key marks C (Power) as the correct answer.
Physics · Question 850
At what angle between force and displacement is work maximally negative?
0°
180°
90°
60°
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Correct answer: B
180°
The printed worksheet key marks B (180°) as the correct answer.