In an engine, an almost ideal gas is compressed adiabatically to half its volume. In doing so, 2820 J of work is done on the gas. Required:
a. How much heat flows into or out of the gas?
b. What is the change in internal energy of the gas?
c. Does its temperature rise or fall?

Energy increases

Explanation:

From the question we are told that

Work done

a)Generally the heat flow for an adiabatic process is 0 (zero)

b)Generally Change in internal energy of gas is mathematically given by

Since

Therefore

Giving

c)With increases in internal energy brings increase in temperature

Therefore

Energy increases

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.