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40kg disk with a radius of 30 cm is spinning around a fixed vertical axis with an angular speed of 10 rad/s. How much work must be done on the disk to bring it to an angular speed of 20 rad/s? a)270J 200J 150J 100J e)40J

40kg disk with a radius of 30 cm is spinning around a fixed vertical axis with an angular speed of 10 rad/s. How much work must be done on the disk to bring it to an angular speed of 20 rad/s? a)270J 200J 150J 100J e)40J

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a 40kg disk with a radius of 30 cm is spinning around a fixed vertical axis with an angular speed of 10 rad/s. How much work must be done on the disk to bring it to an angular speed of 20 rad/s?

a)270J

200J

150J

100J

e)40J

Expert Solution
Step 1

Given mass of disc m=40kg

And its radius r=30cm =0.30m

Initial angular velocity ωi=10 rad/s

Final angular velocity ωf=20 rad/s

 

We know the moment of inertia of the disc is given by

Advanced Physics homework question answer, step 1, image 1

This is the moment of inertia of the disc.

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