Work and power Quiz
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5 questions, one answer each
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1. A force of 20 N moves a trolley 6.0 m in the direction of the force. How much work is done?
- A. 3.3 J
- B. 26 J
- C. 120 J
- D. 12 J
2. A machine transfers 900 J of energy in 30 s. What is its power?
- A. 30 W
- B. 27 000 W
- C. 870 W
- D. 0.033 W
3. Which unit is equivalent to one joule?
- A. 1 N/m
- B. 1 N s
- C. 1 W
- D. 1 N m
4. A 3.0 kW heater is switched on for 10 s. How much energy does it transfer?
- A. 0.30 J
- B. 30 000 J
- C. 30 J
- D. 300 J
5. A wind turbine has a power output of 2.5 MW. What is this in watts?
- A. 2500 W
- B. 250 000 W
- C. 2 500 000 W
- D. 25 000 000 W