A 140 g ball and a 220 g ball are connected by a 40-cm- long, massless, rigid ro

Question

A 140 g ball and a 220 g ball are connected by a 40-cm- long, massless, rigid rod. The balls rotate about their center of mass at 140 rpm. What is the speed of the 140 g ball? Express your answer to two significant figures and include the appropriate units. A car tire is 65.0 cm in diameter. The car is travelling at a speed of 18.0 m/s. What is the tire's rotation frequency, in rpm? Express your answer to three significant figures and include the appropriate units. What is the speed of a point at the top edge of the tire? Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

b. Because of c, we know the tire moves fast enough to cancel out the traveling speed of the car completely. Therefore, the speed at the top is twice the speed of the car: 36.0 m/s

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