resubmission since I typed the first question wrong: A 600 kg piano is being lowered into position by a crane while two people steady it with ropes pulling to the sides. Bob's rope pulls to the left, 17 degrees below the horizontal, with 420 N of tension. Ellen's rope pulls toward the right, 29 degrees below the horizontal. What tension must Ellen maintain in her rope to keep the piano descending vertically at a constant speed? Express your answer in newtons.   What is the tension in the vertical main cable supporting the piano?

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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?”