The figure below shows a gas contained in a vertical piston-cylinder assembly. A vertical shaft whose cross-sectional area is 0.8 cm 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 3 bar. The masses of the piston and attached shaft are 24.5 kg and 0.5 kg, respectively. The piston diameter is D-15 cm. The local atmospheric pressure is 1 bar. The piston moves smoothly in the cylinder and g 9.81 m/s. F= i N - A = 0.8 cm Shaft- Piston - Patr = 1 bar Gas at p = 3 bar D