1. A crate (weight 1292 N) is lowered vertically a distance of 3.0 m by two rope

Question

1.
A crate (weight 1292 N) is lowered vertically a distance of 3.0 m by two ropes at a constant speed of 1.2 m/s. The tension in rope A is TA  =  686 N; the rope makes an angle of ?A  =  45

A crate (weight 1292 N) is lowered vertically a distance of 3.0 m by two ropes at a constant speed of 1.2 m/s. The tension in rope A is TA = 686 N; the rope makes an angle of ?A = 45 degree with the horizontal. Rope B makes an angle of ?B = 59 degree with the horizontal. What is the work that rope A does on the crate? What is the total work done on the crate?

Explanation / Answer

1) WA = TA*d*cos(90+thetaA) = -1445.23 J

2) Wnet = 0 (since its velocity is not changing the net work done is zero)

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