First slide
Concept of potential energy
Question

A man slowly pulls a bucket of water from a well of depth h=20m. The mass of uniform rope and bucket full of water are m=200g and M=19.9 kg respectively. The increases in potential energy of system is

Moderate
Solution

ΔU=mbghb+mrghrΔU=19.9×10×20+2001000×10×202ΔU=3980+20ΔU=4000J

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