A thin uniform rod of mass is hinged at one
end. This rod is maintained in horizontal position by colliding very
tiny balls each of mass m/10 completely elastically 10 times per sec
striking at the opposite end as shown in figure. The speed of the balls
just before colliding rod is [IMAGE].Find n.

Show answer and solution

[IMAGE] Taking torque about hinge:
[IMAGE] TOPIC:Rotaional dynamics
SUB TOPIC: Torque
LEVEL: Moderate

Source: Grass-G / Ph-28 Physics paper FST 16 Jan.docx

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