According to Wired magazine, a fidget spinner has a radius of 3.7 cm and can reach a top rotational speed of 140 rads/sec. What is the Period of the spinner at that speed and what is the tangential velocity at the edge?

The period is the time it takes for the spinner to rotate one revolution, or 2π radians.

T = 2π / ω

T = (2π rad) / (140 rad/s)

T = 0.0449 s

The tangential velocity is the product of the angular velocity and the radius.

v = ωr

v = (140 rad/s) (3.7 cm)

v = 518 cm/s