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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 2-5. 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 1-4 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 / 2 m [d] 10 m [e] 40 / 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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