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Unformatted text preview: 1 GRAVITY Newtons law of gravity Gravitational force (direct integration) gravitational field Symmetry and Invariance arguments gravitational potential, and PE 2 M1 M 2 r What is the force of gravity on (pointlike) M2 caused by (pointlike) M1 ? A ) r F grav =  G M 1 M 2 r 2 r B ) r F grav = + G M 1 M 2 r 2 r C ) r F grav =  G M 1 M 2 r 3 r r D ) r F grav = + G M 1 M 2 r 3 r r E ) None of these or MORE than one of these!! Challenge question: Can you use your answer to predict the mathematical form of Gauss law for gravity? 5 masses, m, are arranged in a regular pentagon, as shown. What is the force of gravity on a test mass at the center? A) Zero B) Nonzero C) Really need trig and a calculator to decide! m m m m m 2.5 4 A little man is standing a height z above the origin. There is an infinite line of mass (uniform density) lying along the xaxis. Which components of the local g field can little man argue against just by symmetry alone?...
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 Spring '11
 STEVEPOLLOCK
 Force, Gravity

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