Answer:
The value is
Step-by-step explanation:
From the question we are told that
The mass of the external weight is

The height through which the mass drops is

The number of revolution made is

The diameter of the free moving piston is

The distance moved by the free moving piston is

The atmospheric pressure is

Generally the workdone by the external weight is mathematically represented as

=

=

Generally the workdone by the free moving piston is mathematically represented as

Here A is the cross-sectional area with value


So

=>

So
The net workdone is mathematically evaluated as

The negative sign shows that it is acting in opposite direction to

So

