Please be very explicit in your development. Thank you!

1.30 Figure P1.30 shows a gas contained in a vertical pistoncylinder assembly. A vertical shaft whose cross-sectional area is 0.8cm2 is attached to the top of the piston. Determine the magnitude, F, of the force acting on the shaft, in N, required if the gas pressure is 3bar. The masses of the piston and attached shaft are 24.5kg and 0.5kg, respectively. The piston diameter is 10cm. The local atmospheric pressure is 1bar. The piston moves smoothly in the cylinder and g=9.81m/s2