Question

The tip of a pinwheel is 0.24 m from the center. The pinwheel spins 5 times each second. What is the tangential speed of the tip of the pinwheel?

0.30 m/s
1.2 m/s
1.5 m/s
7.5 m/s

Answer 1

v = 2π r f. Here r = 0.24 m and f = 5 s⁻¹, so v = 2π(0.24)(5) = 2.4π ≈ 7.54 m/s.

Answer: 7.5 m/s.