Avalve in the cylinder shown in the figure below has a cross-sectional area of 7.8 cm2. the atmospheric pressure is 100 kpa.

given that a force of at least 400 n is required to open the valve (which moves inward to open), determine the gauge pressure inside the cylinder.

give your answer to 4 significant figures. (=512.8kpa i got this correct).

(b) the absolute pressure inside the cylinder is now 1200 kpa. if a gauge were used to measure the gauge pressure inside the system in mm of mercury, what would it be? assume rhomercury = 13595 kg/m3 and g = 9.80665 m/s2.

give your answer to 4 significant figures. (need on this part).

(c) if a force were required to pull the valve outward, what could you say about the pressure (gauge) inside of the system?