A 54.2-kg skateboarder starts out with a speed of 1.89 m/s. He does 81.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -279 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 8.69 m/s. (a) Calculate the change (PEf - PE0) in the gravitational potential energy. (b) How much has the vertical height of the skater changed? Give the absolute value. (a) Number | Units (b) Number |Units

A 54.2-kg skateboarder starts out with a speed of 1.89 m/s. He does 81.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -279 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 8.69 m/s. (a) Calculate the change (PEf - PE0) in the gravitational potential energy. (b) How much has the vertical height of the skater changed? Give the absolute value. (a) Number | Units (b) Number |Units

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Description: A 54.2-kg skateboarder starts out with a speed of 1.89 m/s. He does 81.8 J of work on himself by pushing with his feet against theground. In addition, friction does -279 J of work on him. In both cases, the forces doing the work are non-conservative

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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