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Question

A 20 kg floodlight in a park is supported at the end of a horizontal beam of negligible mass that is hinged to a pole, as shown in figure. A cable at an angle of 30 with the beam helps to support the light. The tension in the cable is


A
392.00
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B
392.0
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C
392
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Solution

Consider the torques about an axis perpendicular to the page and through the left end of the horizontal beam.


τ=(+Tsin30)d(196)d=0

T=392 N

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