Question

A turntable rotates at 45 rpm. Express its angular speed in radian per second and degree per
second.
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Answer 1

Answer:

A turntable rotates at 45 r.p.m means, it takes 1m to complete 45 rotations,

So,time taken to complete

1 rotation is

1/45⋅60s=1.34s

This is the time period(T)(by definition)

So,angular speed=

ω=2π/T=2π/1.34=4.7rad/s