Suppose that you lift an object by exerting an upward force of 12 newtons on it. If gravity exerts a force of 10 newtons downward on the object, what is the total force on the object?.

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.

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Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?