A wheel of radius 0.3 m rotates at 20 rad/s. What is the linear speed of a point on its rim?
Correct answer B. 6 m/s
Explanation
For a point at radius r, v = rω = 0.3 × 20 = 6 m/s. Dividing ω by r instead gives the wrong value of 66.7 m/s.
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