IB · A · multiple choice
Space, time and motion · Question 4
Space, time and motion · Original GioPhysics question with a detailed, mark-by-mark answer guide.
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multiple choice1 mark
A crane lifts a load of mass 250 kg through a vertical height of 12 m in 8.0 s at constant speed. What is the useful output power of the crane?
- A
375 W
- B
2.5 kW
- C
3.7 kW
- D
29 kW
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Answer overviewCorrect answer: C — 3.7 kW
01
1 markAnswer and reasoning
How to approach it
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is C: 3.7 kW
- 2
D is the work done rather than the power, with the division by time omitted. B omits g.
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