Let's first find the mass of Rhea:
g=R2GMβ,M=GgR2β=6.67Γ10β11 kg2NΓm2β0.265 smβΓ(7.64Γ105 m)2β=2.32Γ1021 kg.Then, we can find the volume of Rhea:
V=34βΟR3.Finally, we can find the average density of Rhea:
Ο=VMβ=34βΟR3Mβ,Ο=34βΟΓ(7.64Γ105 m)32.32Γ1021 kgβ=1242 m3kgβ.
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