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Unformatted text preview: Dr. Gundersen and Dr. Galeazzi Phy 205 Test 2 20 October 2010 Signature: Name: 1 2 3 4 5 Idnumber: You must do the first problem which consists of five multiple choice questions. Then you can skip one of the four long problems numbered 25. Clearly cross out the page and the numbered box of the problem omitted. Do not write in the other boxes. If you do all the problems, only problems 14 will be graded. Each problem is worth 25 points for a total of 100 points. A formula sheet is provided on the LAST page which you can tear off. TO GET PARTIAL CREDIT IN PROBLEMS 2  5 YOU MUST SHOW GOOD WORK. CHECK DISCUSSION SECTION ATTENDED: [ ] Dr. Galeazzi 1O, 9:30  10:20 a.m. [ ] Dr. Voss 1P, 11:00  11:50a.m. [ ] Dr. Huffenberger 1Q, 12:30  1:20 p.m. [ ] Dr. Barnes 1R, 2:00  2:50 p.m. [ ] Dr. Gundersen 1S, 3:30  4:20 p.m. [ ] Dr. Nepomechie 3O, 9:30  10:20 a.m. [ ] Dr. Voss 3Q, 12:30  1:20 p.m. Physics 205 Test 2 20 October 2010 Dr. Gundersen and Dr. Galeazzi Phy 205 Test 2 20 October 2010 [1.] This problem has five multiple choice questions. Circle the best answer in each case. [1A.] A particle has mechanical potential energy U ( x ) = (1 J/m 3 ) x 3 (6 J/m 2 ) x 2 + (12 J/m ) x 7 J. Find the value of x where the particle is in equilibrium. [a] x = 0 m [b] x = 2 m [c] x = 2 m [d] x = 12 m [e] x = 12 m [1B.] A new park attraction consists of a vertical wheel with carts for passengers. At full speed the carts move with a speed of 72 km/hour, so that the passengers feel weightless at the top of the wheel. What is the radius of the wheel? Take g=10 m/s. [a] 40 m [b] 20 m [c] 10 /π 2 m [d] 10 m [e] 40 /π 2 m [1C.] A line of three boxes of mass M, 2M, and 3M are sitting in a row on a frictionless surface. A force F is applied to the box of mass M. What net force is exerted on the middle box with mass 2M? [a] 0 [b] F/6 [c] F/3 [d] F/2 [e] F [1D.] The same three masses in the above problem are on the same frictionless surface, but this time they are tied together with massless ropes. The rope connecting mass M to mass 2M has a tension T 1 , the rope connecting mass 2M to mass 3M has a tension T 2 , and a third rope is tied to mass 3M and has an applied tension T on it. What is the tensionrope is tied to mass 3M and has an applied tension T on it....
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 Fall '11
 Galeazzi
 Force, DT DT DT, Dr. Gundersen, Dr. Galeazzi

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