1.A centrifuge in a medical laboratory rotates at an angular speed of 3750 rev/m

Question

1.A centrifuge in a medical laboratory rotates at an angular speed of 3750 rev/min. When switched off, it rotates 54.0 times before coming to rest. Find the constant angular acceleration of the centrifuge.

2.A rotating wheel requires 2.97-s to rotate through 37.0 revolutions. Its angular speed at the end of the 2.97-s interval is 98.7 rad/s. What is the constant angular acceleration of the wheel?
rad/s2

3..Find the net torque on the wheel in the figure below about the axle through O, taking a = 13.0 cm and b = 27.0 cm. (Assume that the positive direction is counterclockwise.)
N

Explanation / Answer

1. angular accleration = 227.14 rad /s2

2. angular acceeleration = 13.78 rad / s2

3. torque = - 3.57 N-m

4. (a) T = 11.307 N

     (b) a = 7.5384 m / s2

     (c) v = 9.2168 m/s

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