Questions 7.-10. refer to a 50.0-kg skater starting from rest on a parabola-shaped track at a height of 7.00 m. 7. If the track is frictionless, how fast (in m/s) would he be moving at the bottom of the track? 8. How would your answer be different if he had twice the mass (100 kg)? b) twice as fast a) same answer c) half as fast d) four times as fast e) none of the above 9. How would your answer be different if gravity was twice as big (19.6 m/s²)? a) same answer b) twice as fast c) half as fast d) four times as fast e) none of the above 10. If there is enough friction between the skater and the track to make the skater stop at a height of 5 m on the other end of the track, how much mechanical energy (in joules, positive number) is lost due to friction?

Questions 7.-10. refer to a 50.0-kg skater starting from rest on a parabola-shaped track at a height of 7.00 m. 7. If the track is frictionless, how fast (in m/s) would he be moving at the bottom of the track? 8. How would your answer be different if he had twice the mass (100 kg)? b) twice as fast a) same answer c) half as fast d) four times as fast e) none of the above 9. How would your answer be different if gravity was twice as big (19.6 m/s²)? a) same answer b) twice as fast c) half as fast d) four times as fast e) none of the above 10. If there is enough friction between the skater and the track to make the skater stop at a height of 5 m on the other end of the track, how much mechanical energy (in joules, positive number) is lost due to friction?

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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