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Post: [Physics] Simple Question I need assistance with
Forum: Homework Help
Assigned Moderators: SellerMan

Posted by: Porge
Original Content:

They give you the equation:

g = G*m/r^2

solving for r, we get

r = sqrt(G*m/g)

and plugging in the values we are given,

r = sqrt(6.67e-11*5.97e24/9.81) = 6.37e6 m

V = 4/3*pi*r^3 = 4/3*pi*(6.37e6)^3 = 1.08e21 m^3

Solving for density,

density = m/V = 5.97e24/1.08e21 = 5.51e3 kg/m^3

Should convert that to whatever units necessary

Thanks so much, really greatful. The way it was worded kept tripping my brain up

 

Took care of your report.