What's the speed?

Question

A cylinder that has a mass of 20g and a radius of 30 cm is on a turntable that is spinning, it takes the cylinder 4.1 s to go all the way around, whats the speed of the cylinder?

Answer 1

I assume you are asking for the tangential speed at the edge.

v = rω

r = 0.30 m

ω = (2π rad) / (4.1 s) = ? rad / sec

Plug in the numbers and get v in m/s.