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A sphere of density rho and radius a has...

A sphere of density `rho` and radius a has a concentric of radius b as shown in the
(a) Sketch the gravitational force exerted by the spehre on the particle of mass m located at a distance r from the centre of the sphere as a function of r in the range `0 le r le oo`
(b) Sketch the corresponding curve for the potential energy u (r) of the system
,

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