A metal ring of weight 120 N can slide up or down a vertical rod. The ring is attached by a cable to the ceiling (at the angle of 65° with respect to the ceiling) as shown in the figure. Assuming the static friction coefficient of 0.600 between the ring and the rod, find the minimal tension in the cable that will prevent the ring from sliding down the rod and thus keep it in place, a. 128 N b. 114 N c. 103 N d. 96 N e. 91 N

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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?”