Can't figure out this Torque/Rotational physics problem. Picture attached.

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

The discovery of the electron as a subatomic particle was a result of

A200-n force is applied to the foot-operated air pump. the return spring s exerts a 2.6-n·m moment on member oba for this position. determine the corresponding compression force c in the cylinder bd. if the diameter of the piston in the cylinder is 40 mm, estimate the air pressure generated for these conditions. state any assumptions. enter a positive number for the compression force c.