Question

Calculate the height through which a body of mass 40 kg can be lifted when 800J of
work is done on it. Take g=10 ms 2.
1.​

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Physics

Work, Energy and Power

Power

The work is done in lifting...

PHYSICS

The work is done in lifting a body of mass 20 kg and specific gravity 3.2 to a height of 8 m in

water is,

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ANSWER

It is given that,

Mass of body =20kg

Specific gravity =3.2

The mass of the water that will be displaced by body:

3.2

20

=6.25kg

The force exert on the body downwards because of gravity :

20×10=200N

The force exerted by water in upward direction:

6.25×10=62.5N

Thus, total force =200−62.5=137.5N

The work done in lifting a body to a height of 8m:

137.5×8=1100J

Hence, the work done in lifting a body to a given height is 1100J