A child of mass 30kg swings at the end of an elastic cord. At the bottom of the swing, the child's velocity is horizontal, and the speed is 9.8m/s. At this instant, the cord is 5.85m long. A) at this instant what is the magnitude of the rate of change of the child's momentum? B) at this instant what is the net force acting on the child? C) what is the magnitude of the force that the elastic cord exerts on the child? D) the relaxed length of the elastic cord is 5.78m. What is the stiffness of the cord?

University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter9: Linear Momentum And Collisions
Section: Chapter Questions
Problem 34P: A ball of mass 250 g is thrown with an initial velocity of 25 m/s at an angle of 30 with the...
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A child of mass 30kg swings at the end of an elastic cord. At the bottom of the swing, the child's velocity is horizontal, and the speed is 9.8m/s. At this instant, the cord is 5.85m long. A) at this instant what is the magnitude of the rate of change of the child's momentum? B) at this instant what is the net force acting on the child? C) what is the magnitude of the force that the elastic cord exerts on the child? D) the relaxed length of the elastic cord is 5.78m. What is the stiffness of the cord?

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