Physics Help Forum gravitational fields

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Jan 17th 2009, 11:39 AM #1 Junior Member   Join Date: Jan 2009 Posts: 22 gravitational fields 1) A Moon moves around a planet in a circular orbit. The radius of the orbit is 3.84*108 m, its period is 27.3 days and its mass is 7.35*1022 kg.Calculate the force exerted on the Moon in order to keep it in orbit. What is this force?
 Jan 18th 2009, 06:24 PM #2 Junior Member   Join Date: Jan 2009 Posts: 2 Fg = GMm/r = (6.67*10^-11)(7.35*10^22)M/(3.84*10^8) T^2 = (39.5/GM)r^3 2358720 = 39.5/(6.67*10^-11M)(5.66*10^25) 2.78*10^-30 = 39.5/M M = 1.42 * 10^31 (6.67*10^-11)(7.35*10^22)(1.42*10^31)/(3.84*10^8) = 1.82 * 10^35 = Fg

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