Question

A piston and gas filled cylinder take in 140 J of energy and output 60 J of waste heat. how much work can be done by the gas?____ J In another situation; A piston does 3.2 J of work and loses 1.4 J waste heat. How much heat was input to the system? ____ J

Answer 1

Given data

*The given internal energy is U = 140 J

*The given heat is Q = 60 J

The formula for the work can be done by the gas is given as

`\begin{gathered} Q=U+W \\ W=Q-U \end{gathered}`

Substitute the known values in the above expression as

`\begin{gathered} W=(60)-(140) \\ =-80\text{ J} \end{gathered}`

Here the negative sign indicates that the work can be done by the gas.