10. A 50-kg box is 10 meters above the floor. This box is lifted 20 meters...

Question

Question

10. A 50-kg box is 10 meters above the floor. This box is lifted 20 meters to point B. It is then lowered 25 meters to point

Answer 1

Answer #1

Height at each point is

H_A = 10 m

H_B = 20+10 =30 m

H_C=30-25=5 m

a)

The Change in potential energy of the box between points A and C

XU = mg/H - Hc) = (50) (9.81) 10 – 5) = 2452.5 Joules

b)

Power required to move box from A to C is

P=2452.5/20 =122.625 Watts

In hp

P=122.625/745.7 =0.1644 hp

Answer 2

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