2. The solid cylinder at the right has a mass of 2.0 kg and can rotate about an

Question

2. The solid cylinder at the right has a mass of 2.0 kg and can rotate about an axis through its center. Given the forces and dimensions shown, find: A. The net torque on the cylinder. B. The angular acceleration of the cylinder C. The magnitude of tangential acceleration of a point on the rim of the disk. 12 cm 5.0 em .0N 3. A small ball of mass 0.75 kg is attached to one end of a 1.25 m long massless rod and the other end of the rod is hung from a pivot. When the resulting pendulum s 30.0 from vertical, what is the magnitude of the torque about the pivot?

Explanation / Answer

2. (A) net torque = (0.12 x 6) - (0.12 x 4) - (0.05x2)

= 0.38 N m

(B) torque = I alpha

.38 = (2 x 0.12^2 / 2) alpha

alpha = 26.4 rad/s^2

(C) a_t = alpha r = 3.17 m/s^2

3. torque = (L/2)( m g )sin30

= 2.30 N m

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