A cubical block of mass M and edge a slides down a rough inclined plane of inclination 9 with a uniformvelocity. The torque of the normal force on the block about its centre has a magnitude

(a) zero

(b) Mga

(c) Mga sinθ  

(d) 1/2 mga sinθ  

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1 Answers

(d) 1/2 Mga sinθ.

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