#18 | Torque
(Physics) > Systems of Particles and Rotational Motion
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A wheel is rotating about an axis through its centre at 720 r.p.m. t is acted on by a con- stant torque opposing its motion for 8 sec- onds to bring it to rest finally. The value of torque in Nm is (oiven - 24 Kg m) (A)48 (B) 72 (C) 96 (D) 120

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An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver CBSE PMT 2000] (a) 350 N-m (c) 531 N-m (b) 440 N-m (d) 628N-m

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A force F=4i-5j +3k is acting a point η =i+2j +3k. The torque acting about a point ½-3-2-3k is [Pb. PET 2001] (a) Zero (b) 421-30j+6k (c) 42i+30j + 6k (d) 421+30-6k

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A wheel whose moment of inertia is 12 kgm2 has an initial angular velocity of 40 rad/sec.A constant torque of 20 Nm acts on the wheel. The time in which the wheel is accelerated to 100 rad/sec is (A) 72 seconds(B)16 seconds (C) 8 seconds (D) 36 seconds

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In the following figure, a weight Wis attached to a string wrapped round a solid cylinder of mass M mounted on a frictionless horizon- tal axle at o If the weight starts from rest and falls a distance h, then its speed at that instant is R. (A) proportional to R (B) proportional to R (C) proportional to R2 (D) independent ofR

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