A box weighing 77.0 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end. (use Figure below) a.) Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs 30.0 N. Express your answer to three significant figures and include the appropriate units. FBT1=___________ ___________   b.) Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs 60.0 N. Express your answer to three significant figures and include the appropriate units. FBT2=_______________ ______________   c.) Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs 90.0 N. Express your answer to three significant figures and include the appropriate units. FBT3= ______________ ______________

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”