A centrifuge rotor rotating at 10,300 rpm is shut off and is eventually brought

Chapter 8, Problem 37P

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QUESTION:

Problem 37P

A centrifuge rotor rotating at 10,300 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.20 m·N. If the mass of the rotor is 4.80 kg and it can be approximated as a solid cylinder of radius 0.0710 m, through how many revolutions will the rotor turn before coming to rest, and how long will it take?

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QUESTION:

Problem 37P

A centrifuge rotor rotating at 10,300 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.20 m·N. If the mass of the rotor is 4.80 kg and it can be approximated as a solid cylinder of radius 0.0710 m, through how many revolutions will the rotor turn before coming to rest, and how long will it take?

ANSWER:

Solution 37P:

Step 1 of 3:-

Here we need to calculate the number of rotations before coming to rest and the time it will take for it.

The initial frequency was: .

The initial angular velocity can be calculated as,

.

The final angular velocity is: .

We know that,

.

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