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Unformatted text preview: 1 Name: Phy 3221 Test # 2 April 6, 2011 Problem 1: (5 points ) An object is dropped from an altitude of one Earth radius above Earth’s surface. If M is the mass of Earth and R is its radius the speed of the object just before it hits Earth is given by: (circle the correct answer) A. ( GM/R ) 1 / 2 Correct answer. B. ( GM/ 2 R ) 1 / 2 C. (2 GM/R ) 1 / 2 D. ( GM/R 2 ) 1 / 2 E. ( GM/ 2 R 2 ) 1 / 2 Problem 2: (5 points ) A spherical shell has inner radius R 1 , outer radius R 2 , and mass M , distributed uniformly throughout the shell. The magnitude of the gravitational force exerted on the shell by a point mass m , located a distance d from the center, outside the outer radius, is: A. 0 B. GMm/R 2 1 C. GMm/d 2 Correct answer. D. GMm/ ( R 2 2 d 2 ) E. GMm ( R 1 d ) 2 2 Problem 3: An object of mass m is attracted toward the origin by a force whose magnitude is  ~ F  = mk 2 /r 3 . a. (5 points ) If the object is in a circular orbit at radius R , then what is its speed v ?...
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 Spring '08
 CHAN
 mechanics, Mass, General Relativity, Special Relativity, Correct Answer, Oort, Oort’s frame

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