Two forces are acting on an object. which of the following statements is correct, if the object experiences translational and rotational equilibrium? oa the object is in equilibrium if the forces are equal in magnitude and opposite in direction o b. the object is in equilibrium if the forces act at the same point on the object. o c. the object is in equilibrium if the net force and the net torque on the object are zero. od. the object is in equilibrium if the net torque on the object is zero. oe. an object will never be in equilibrium with two or more forces acting on it.

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.