Question

A man pulls a bucket full of water from h metre deep well. If the mass of rope is m and mass of bucket full of water is M, then work done by the man is.
(1)(M/2+m)gh (2){(M+m)/2}gh (3)(M+m/2)gh (4) (M+ m) gh
Please explain the steps.​

Answer 1

Answer:

Explanation:

Work = force x distance = mass x g x height

for rope w1 = m'.g.h' = mgH/2 (centre of mass of rope = h/2 from both ends)

for bucket w2 = m''.g.h'' = MgH

adding the two,

total W = w1 + w2 = gH(M+m/2) = (M+m/2).g.H