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I need help fast Calculation of the gravitational force. 1. What is the gravitational force (in N) on a proton at the surface of the

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Calculation of the gravitational force. 1. What is the gravitational force (in N) on a proton at the surface of the Sun? 2. At a point mid way to the surface? The average density p of the Universe today is 3 x 10-27kgm-3. 1. Find this density in (a) gem (b) MMpc (c) mpem-3 2. Find the mass within a sphere of radius (a) Ro (b) 1 AU (c) 10 Mpc

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