Achain 65 meters long whose mass is 27 kilograms is hanging over the edge of a tall building and does not touch the ground. how much work is required to lift the top 4 meters of the chain to the top of the building? use that the acceleration due to gravity is 9.8 meters per second squared.

1050.35 J

Explanation:

Given

length of chain=65 m

mass of chain=27 kg

we know work done is given by

Let is mass density

for dx length mass is dm

dm=

We need to see the change in potential energy only as gravity is uniform and chain is freely suspended

=1050.35 J

f is prop to m1xm2 double m1 double force

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures