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The density of a certain planet varies with radial distance as: D(r) = Do*[1-(a*r/Ro)], where Ro= 3.1623×106 m is the radius of the planet, Do = 3160 kg/m3 is its central density, and a = 0.160. Calculate the total mass of this planet.

Calculate the weight of a one kilogram mass located on the surface of the planet.

i tried integrating D(r) with and plugin in the radius of the planet but it doesn't work

i know this question has somethin to do with integrating through shell method but i'm not sure how to do it

can any1 help me?

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# Homework Help: Planet density

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