Questions
Four objects with the same mass and radius are spinning freely about a diameter with the same angular speed. Arrange the work required to stop them in the decreasing order
a) Solid sphere b) Hollow sphere c) Disc d) Hoop
detailed solution
Correct option is A
Magnitude of work done, W=KEf-KEiSince final KE is zero work done is equal to KEiNow KEi =12Iω2Isolid sphere=25MR2,Ihallow sphere=23MR2Idisc=12MR2,Ihoop=MR2Talk to our academic expert!
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A uniform thin rod of length l and mass m is hinged at a distance l/4 from one of the end and released from horizontal position as shown in Fig. The angular velocity of the rod as it passes the vertical position is
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