[題目] wheel rotates
A wheel rotates about a fixed axis with a constant angular acceleration of
4.0 rad/s2. The diameter of the wheel is 40 cm. What is the linear speed of a point on the
rim of this wheel at an instant when that point has a total linear acceleration with a
magnitude of 1.2 m/s2?
A. 39 cm/s B. 42 cm/s C. 45 cm/s D. 35 cm/s E. 53 cm/s
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