A construction crane lowers a beam into place at constant speed. Consider the work Wg done by gravity on the beam and the work WT done by the tension in the cable on the beam. Which is true?
A) Wi is positive and Wr is positive.
B) We is positive and W'r is negative.
C) Wg is negative and W'r is negative.
D) Wi and W'r are both zero.
E) None of the above
Answers: 3
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A construction crane lowers a beam into place at constant speed. Consider the work Wg done by gravit...
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