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Question
A child attaches a rubber ball to a string and whirls it around In a circle overhead. if the string is 0.6m long and the ball speed is 11m/s, what is the calls centripetal acceleration?
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A centripetal force of 165 N acts on a 1,050-kg satellite moving with a speed of 4,700 m/s in a circular orbit around a planet. What is the radius of its orbit?
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A runner with a mass of 79 kg accelerates from 0 to 6 m/s in 9 s. Find the net force on the runner using the alternate form of Newton’s second law.
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Using the alternate form of Newton’s second law, compute the force (in N) needed to accelerate a 1,190 kg car from 0 to 34 m/s in 17 s. The change in momentum is the car’s momentum when traveling 34 m/s minus its momentum when going 0 m/s. (Enter the magnitude.)
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