Apiston-cylinder device contains helium gas initially at 150 kpa, 20 o c, and 0.5m 3 . the helium is now compressed in a polytropic process () to 400 kpa and 140 o c. determine the work and heat transfer done during this process.

Explanation:

Given

R for Helium

mass of gas

Similarly can be found

Work done

Since it is a polytropic Process

therefore

From Energy balance

Neglecting kinetic and Potential Energy change

Change in Internal Energy

i.e. Heat is being removed

the force required to move the cart is divided by three or 33.33 n.

hypothesising or postulating