The asteroid Ceres has a mass of 7x10^20 and a radius of 500km
a. what is the gravity on the surface
b. How much would a 85kg astronaut weigh in ceres
Fg = (Gm1m2)/r^2
The Attempt at a Solution
None, where do I get the seccond mass value from? or am I using the wrong equation?
pls help, all constructive input appreciated :)