Question

如图，求解，求具体过程

Answer 1

GMm/r²=mg
M=g'R^2/G

M=ρV=ρ*(4/3)πR^3
ρ*(4/3)πR^3=g'R^2/G
ρ=(3g')/(4πGR)

GMm/r²=m(2π/T)²r
M=4π^2*R^3/(G*T^2)
M=ρV=ρ*(4/3)πR^3
ρ*(4/3)πR^3=4π^2*R^3/(G*T^2)
ρ=3π/G*T^2
望采纳，谢谢！

追问

第三点呢

追答

哪个第三点？
是说第三小题？
GMm/r²=m(2π/T)²r
M=4π^2*R^3/(G*T^2)

M=ρV=ρ*(4/3)πR^3
ρ*(4/3)πR^3=4π^2*R^3/(G*T^2)
ρ=3π/(G*T^2)