A wheel of diameter 1 m turns at 30 revolutions per minute. What is the linear speed of a point on its rim, in m s⁻¹?
Correct answer C. π/2
Explanation
30 rev/min is 0.5 rev/s, giving ω = π rad/s; with radius 0.5 m, v = ωr = π × 0.5 = π/2 m s⁻¹.
Answer checked How we write and check questions
Discussion