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The density of a certain planet varies with radial distance as: D(r) = Do*(1-a*r/Ro), where Ro= 6.3096×106 m is the radius of the planet, Do = 3980 kg/m3 is its central density, and a = 0.290. Calculate the total mass of this planet.Calculate the weight of a one kilogram mass located on the surface of the planet.

Can anyone help me out?

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# Gravity and weight

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