A.3 Work, energy and power Quiz
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5 questions, one answer each
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1. A 1500 kg car moves at 20 m s⁻¹. What is its kinetic energy?
- A. 30 kJ
- B. 300 kJ
- C. 600 kJ
- D. 15 kJ
2. A body has momentum 12 kg m s⁻¹ and mass 3.0 kg. What is its kinetic energy?
- A. 24 J
- B. 72 J
- C. 18 J
- D. 4.0 J
3. A car's engine provides a driving force of 800 N at a constant speed of 25 m s⁻¹. What is the output power of the engine?
- A. 32 W
- B. 20 kW
- C. 825 W
- D. 200 kW
4. A motor with an input of 500 J lifts a load, giving it 350 J of gravitational potential energy. What is its efficiency?
- A. 0.30
- B. 0.70
- C. 1.4
- D. 0.15
5. A pendulum swings with no air resistance. Which statement is correct?
- A. Its kinetic energy is constant
- B. Its total mechanical energy is constant
- C. Its gravitational potential energy is constant
- D. Its speed is greatest at the highest point