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(a) Find his speed at the bottom of the half-pipe (point B). m/s (b) Immediately after passing point®, he stands up and raises his arms, lifting his center of mass and essentially "pumping" energy into the system. Next, the skateboarder glides upward with his center of mass moving in a quarter circle of radius 5.39 m, reaching point D. As he passes through point, the speed of the skateboarder is 4.91 m/s. How much chemical potential energy in the body of the skateboarder was converted to mechanical energy when he stood up at point ? (c) How high above point does he rise? Im

(a) Find his speed at the bottom of the half-pipe (point B). m/s (b) Immediately after passing point®, he stands up and raises his arms, lifting his center of mass and essentially "pumping" energy into the system. Next, the skateboarder glides upward with his center of mass moving in a quarter circle of radius 5.39 m, reaching point D. As he passes through point, the speed of the skateboarder is 4.91 m/s. How much chemical potential energy in the body of the skateboarder was converted to mechanical energy when he stood up at point ? (c) How high above point does he rise? Im

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A skateboarder with his board can be modeled as a particle of mass 79.0 kg, located at his center of mass. As shown in the figure below, the skateboarder starts from rest in a crouching position at one lip of a half-pipe (point 4). On his descent, the skateboarder moves without friction so that his center of mass moves through one quarter of a circle of radius 5.80 m. (a) Find his speed at the bottom of the half-pipe (point B). m/s (b) Immediately after passing point ®, he stands up and raises his arms, lifting his center of mass and essentially "pumping" energy into the system. Next, the skateboarder glides upward with his center of mass moving in a quarter circle of radius 5.39 m, reaching point D. As he passes through point, the speed of the skateboarder is 4.91 m/s. How much chemical potential energy in the body of the skateboarder was converted to mechanical energy when he stood up at point B? J (c) How high above point does he rise? Submit Answer m
Transcribed Image Text:A skateboarder with his board can be modeled as a particle of mass 79.0 kg, located at his center of mass. As shown in the figure below, the skateboarder starts from rest in a crouching position at one lip of a half-pipe (point 4). On his descent, the skateboarder moves without friction so that his center of mass moves through one quarter of a circle of radius 5.80 m. (a) Find his speed at the bottom of the half-pipe (point B). m/s (b) Immediately after passing point ®, he stands up and raises his arms, lifting his center of mass and essentially "pumping" energy into the system. Next, the skateboarder glides upward with his center of mass moving in a quarter circle of radius 5.39 m, reaching point D. As he passes through point, the speed of the skateboarder is 4.91 m/s. How much chemical potential energy in the body of the skateboarder was converted to mechanical energy when he stood up at point B? J (c) How high above point does he rise? Submit Answer m
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