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
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
This is the moment of inertia of the disc.
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