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Unformatted text preview: PHYS 121 (SP11) EXAM 2 50 pts maximum NAME(print clearly): DiscussionSection (required): Youcan bring a 3xS inch index card. Only non-programmable and non-graphing calculator is allowed. Write legibly and present your solutions in an organized and coherent form. Use pencil. Youmust show all work, not just the answers. Acorrect answer alone willreceive zero point. Q1. One tine spring day, you decide to take a break from studying and go to the amusement park to ride the loop-the-Ioop roller coaster. Atthe bottom of the loop, you're movingwith a speed of 20 m/s in a vertical circle 10 m in radius. Assume your mass is 60 kg. a) Drawand label a free-body diagram of your body in the given box. Besure to correctly and clearly show the relative magnitudes of the forces, the net force and your coordinate system. (2 pts) Free-body diagram 'I \ 'fr~__~ IT r)? N- !j tV-=- tF fG-t)r 1 ~ tfl.f5 tfJ. / fI1-Vf I11J '" rn (7 +J) ~ 60 h (f;.m/5t + J. gi~ ) () 10m ~ 1fJ (uh /wnt'K-/ Q2. The next game at the amusement park has you give a puck (m=0.03 kg)a quick shove so that it slides up a long ramp inclined at an angle of 15to the horizontal, you win a stuffed animal ifthe puck comes to within 10 cm of the end of the ramp without flyingoff. Asign on the wall tells you that the coefficient of kinetic friction between the ramp and the puck is 0.12.coefficient of kinetic friction between the ramp and the puck is 0....
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This note was uploaded on 12/14/2011 for the course PHYS 121 taught by Professor Angerson during the Fall '07 term at UMBC.
- Fall '07