An electric motor with an output of 25 kW provides power for the elevator of a seven-story building. If the total mass of the loaded elevator is 1000 kg, what is the minimum time needed for it to rise the 40 m from the ground floor to the top floor?
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Answer:
time taken = 15.68 sec
Explanation:
height = 40m
Power = 25kW
Mass = 1000 kg
Total work done = mgh
= 1000 × 9.8 × 40
= 392000 J
Power = work done / time taken
25×1000 = 392000/time taken
time taken = 392000/25000
time taken = 15.68 sec
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