college physics
posted by Mandy on .
Two solid spheres A and B are made from the same material. The mass of sphere B is eight times that of sphere A. If the radius of sphere A is 7.50 cm, what is the radius of sphere B? [Volume of a sphere of radius r is given by V = 4ðr63/3]

Assumeing density is the same.
MassA=density*4/3 PI ra^3
MassB= density*4/3 PI rb^3
divideing the second by the first
8=(rb/ra)^3 It sure looks like the ratio of rb/ra is 2.
check my work.