A system shows a cylinder with $8$ cm inside diameter having a piston loaded with a

spring of stiffness $15k\frac{N}{m}.$ The intial conditions of air are pressure being $3$ bar,

volume being $45$ cm$^3$ and temperature of $20$ C$?$

Determine amount of heat added to system so that piston moves by $3\mathrm{.}5$ cm

$C_v=0\mathrm{.}718kJk{g}^{-1}{K}^{-1},R=0\mathrm{.}287k\frac{J}{k}g.$ans: $0\mathrm{.}252$kPa