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Unformatted text preview: are nearly in contact with each other. (a) What is the gravitational force between the two? (b) Calculate the ratio of the gravitational force to the weight of the sphere if its density 8 g/cm 3 (about right for steel) and its mass m 1 kg . Physics 325 Spring 2011 Homework 3B Name: ____________________________ Due: Feb 23, 2011 by 9 am (lecture or 325 box) 3. (10 points) Calculate the gravitational potential due to a thin rod of length and mass M at a distance R from the center of the rod and in a direction perpendicular to the rod. 4. (10 points) Calculate the gravitational potential ( r ) in the plane of a thin circular ring of radius R and mass M , where r is the distance from the center of the ring. Its fine to write the answer as a Taylor series, but show at least the first and second term. Show the potential when r R and interpret....
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