# Physics

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A heavy concrete panel is being lifted into position in a building by means of a crane (see figure below). The tension of 2.52 104 N in the supporting cable produces a torque with respect to point O. (Let L = 41.0 m.)

(a) Does this torque tend to rotate the panel clockwise or counterclockwise about an axis through point O?

counterclockwise
clockwise

(b) Find the torque.
2

• Physics -

(a) clockwiûe.
(b)
Torque =T•L•cosα- mg•(L/2) •cosα=
=(T - mg/2) •L•cosα

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