How much power is needed to lift a 75-kg student vertically upward at a constant speed of 0.33 m/s?
A)12.5 W
B)25 W
C)115 W
D)230 W
E)243 W

Question

Quizplus · Accepted Answer

The power required is calculated using the formula P = F * v, where F is the force (equal to the weight of the student, mg) and v is the velocity. Here, F = 75 kg * 9.8 m/s² = 735 N, and v = 0.33 m/s. Thus, P = 735 N * 0.33 m/s = 242.55 W, which is approximately 243 W.

How Much Power Is Needed to Lift a 75-Kg Student