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11. A motor spins a disk (Idisk = 24.2 kg*m2) with a torque of 39 N*m,...

11. A motor spins a disk (Idisk = 24.2 kg*m2) with a torque of 39 N*m, and a 18 N frictional force acts on the disk at a radius of 1.3 m. Attached to the disk at a radius of 1.8 m is a 10 kg mass. What is the magnitude of the angular acceleration in rad/s2 of the system?

12. A 1.4-kg projectile is fired from level ground. The vertical component of the initial velocity is 83 m/s and the horizontal component is 24 m/s. Ignore air resistance and the curvature of the earth in this problem. How far in meters does the projectile travel horizontally?

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Answer #1

I disk 24.2 kg m 2 F = 18N T = 3g N.m ir= 1.3m T = IL = For L = For - 18X1.3 0.96 rad/s2 I 24.2 2 m = 1.4kg Vy 83m/s Vr = 24

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