Agas is contained in a vertical piston-cylinder assembly. a vertical shaft whos cross-sectional area is 0.8 cm2 is attached to the top of the piston. determine the magnitude, f, of the force acting on the top of the piston, 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 10 cm. the local atmospheric pressure is 1 bar. the piston moves smoothly in the cylinder and g = 9.81 m/s2 .

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards