Tuesday, September 18, 2012

If you do 110 J of work to elevate a bucket of water, what is its gravitational potential energy relative to its starting position

When a body is raised by a height h, it requires work to
be done. This is equal to m*g*h, where m is the mass of the body, g is the acceleration
due to the gravitational force of attraction and h is the height it is raised
by.


If 110 J of work is done in raising the bucket of water
from its starting position, the work done is stored as gravitational potential energy of
the bucket. Its height increases by 110/m*g.


According to
the law of conservation of energy, the total energy in a system remains the same. When
you do work on the bucket of water equal to 110 J, the increase in the gravitational
potential energy of the bucket is also 110 J.

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