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10.8 Torque. Torque is a turning or twisting action on a body about a rotation axis due to a force, . Magnitude of the torque is given by the product of the moment arm and the magnitude of the force. Torque is a vector. The SI unit of torque is the newton-meter (N · m).

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## 10.8 Torque

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**10.8 Torque**Torque is a turning or twisting action on a body about a rotation axis due to a force, . Magnitude of the torque is given by the product of the moment arm and the magnitude of the force. Torque is a vector.The SI unit of torque is the newton-meter (N · m). Torque is positive if it tends to rotate a body at rest counterclockwise and negative if it tends to rotate the body in the clockwise direction.**Problem 45, P 270**The body shown below is pivoted at O, and two forces act on it as shown. What is the net torque about the pivot?**Problem 71, Page 272: In Fig. 10-47, two 6.20 kg blocks are**connected by a massless string over a pulley of radius 2.40 cm and rotational inertia 7.4x10^(-4) kg.m^2. The string does not slip on the pulley; it is not known whether there is friction between the table and the sliding block; the pulley's axis is frictionless. When this system is released from rest, the pulley turns through 1.30 rad in 91.0 ms and the acceleration of the blocks is constant. What are (a) the magnitude of the pulley's angular acceleration, (b) the magnitude of either block's acceleration, (c) string tension T1, and (d) string tension T2?

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