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Unformatted text preview: Nicholas Charles Miller- PHY183, Spring 2010 - Physics for Scientists and Engineers I 1 Homework Set 6 Due date: Sun Feb 28 23:59:00 2010 A skier of mass 77 kg starts from rest at the top of a hill that is inclined at 13.5 with the horizontal. The hillside is 175 m long, and the coefficient of friction between snow and skis is 0.073. At the bottom of the hill, the snow is level and the coefficient of friction is unchanged. What is the speed of the skier at the bottom of the hill? Tries 0/99 How far does the skier glide along the horizontal portion of the snow before coming to rest? Tries 0/99 Please decide which of the following statements for car collisions are true or false. Choices: True , False . A. Car 1 has a mass m , and car 2 has a mass 2 m . In a two-car head-on collision of these cars traveling with identical speeds in opposite directions, car 1 receives a bigger impulse than car 2. B. Car 1 has a mass m , and car 2 has a mass 2 m . In a two-car head-on collision of these cars traveling with identical speeds in opposite directions, car 2 exerts twice the force on car 1 than car 1 exerts on car 2. C. It would be possible to build cars that bounce off each other in accidents much more elastically than present designs, thus greatly reducing damage to the cars. However, the impulse received by passengers in collisions would then be much greater, thus causing vastly more injuries and deaths. D. If car one has a mass m and a speed v , and car two has a mass of (2 / 3) m speed 1 . 5 v , then both cars have the same momentum. E. Crumple zones on cars are parts of the front of the car that are designed to receive maximum deformation during a head-on collision. The essential safety benefit of crumple zones results from absorbing kinetic energy, convertinga head-on collision....
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