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Q. A 6.0 kg box is held at rest by two ropes that form a 30 degree angle with the vertical. and external for F acts vertically downward on the box. the force exerted by each of the two ropes is denoted by T. A force diagram shows the fours forces acting on the box at equilibrium. Magnitude of force F is 410 N.

Q. A weight lifter lifts a 320 N set of weights from ground level to a position over his head, a vertical distance of 2.15 m. How much work does the weight lifter do, assuming he moves the weights at constant speed?

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