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Unformatted text preview: PHYS 2425  Dr. Honan  Test 3  A Name ________________ Possibly Useful Information: g = 9.80m/s 2 , G = 6.67 1011 N m 2 /kg 2 , steel = 11 106 / C , gasoline = 960 106 / C Problem 1 Short answer (2 points each) Which of the following could be used to find the mass of Jupiter? Answer yes or no. ______ (i) The speed and period of Europa, one of Jupiter's moons. ______ (ii) The radius and speed of Jupiter's orbit about the sun. A crazed physicist risks his life rotating on a frictionless stool. When he pulls his arms in he spins faster. Give the signs of the changes (as he moves his arms inward) in kinetic energy, angular momentum and angular velocity. Answer +,  or 0. ______ [iii] K ______ [iv] L ______ [v] Problem 2 (a) A 200 kg spherical mass is at the origin, an 800 kg spherical mass is at (3m,0) and a 500 kg mass is at (0,2m). What is the net force on the 200 kg mass? (7 points) (b) If the 800 kg and 500 kg masses in part (a) are fixed in place then what is the smallest speed that the 200 kg...
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 Spring '09
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