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Spring 2006 - Scott Pratt PHY231 Spring 2006 Introduct...

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Scott Pratt - PHY231, Spring 2006 - Introduct 1 Midterm 2 (lecture students) 4 pt Two velcro-covered pucks slide across the ice, collide and stick to one another. Their interaction with the ice is frictionless. Puck A is moving to the right at 6 m/s. Puck B has twice the mass as the first puck and is also moving to the right, but at a slower speed of 2 m/s. . Puck A will increase its speed after the collision. 1 . A True B False . Momentum is conserved in the collision. 2 . A True B False . Puck B will increase its speed after the collision. 3 . A True B False . Kinetic energy is conserved in the collision. 4 . A True B False 2 pt M M a) b) M c) Consider the five identical springs shown above supporting the three identical masses as shown. When in equilibrium, the energy stored in the spring in (a) is U a , the combined energies stored in the two springs joined end-to-end in (b) is U b , and the combined energies stored in the two springs in (c) is U c . . U c is U a 5 . A one fourth B one half C equal to D twice E 4 times . U b is U a 6 . A one fourth B one half C equal to D twice E 4 times 4 pt A B C D E F G H J(out of page) I(into page) The race car above travels at constant speed around a circular banked race track as shown. The designers chose a banking angle such that at 150 mph, a car could travel around the track even in slick conditions when frictional forces between the tires and road would disappear. Vectors A-J have direc- tions shown in the picture, with vector J pointing out of the page in the direction the car is moving and I pointing op- posite the car’s velocity. Vectors D and H are perpendicular to the surface, while vectors B and F are parallel to the sur- face. Vectors A and E are horizontal, while vectors C and G are vertical. For these questions, ignore the effects of air resistance. . If the car is going at a constant speed of 100 mph, the direction of the frictional force acting on the car (due to the track) is described by vector . 7 . A A B B C C D D E E F F G G H H I I J J . If the car is moving at a constant speed of 150 mph, the direction of the net force acting on the driver is described by vector .
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