Asked by Sam

A solid uniform sphere has a mass of 7.0 104 kg and a radius of 1.2 m.
(a) What is the magnitude of the gravitational force due to the sphere on a particle of mass m = 0.7 kg located at a distance of 2.1 m from the center of the sphere?
N
(b) What if it is 1.0 m from the center of the sphere?
N

Answers

Answered by drwls
I will gladly help the first student who shows evidence of his or her own work. You do not appear to be among that vanishing group.

Answered by Sam
Okay so far i have F=Gm1m2/r^2
G=6.67 x10^-11
m1=.7
m2=7.0x10^4
what do i use for r?
Answered by Tyler
a. f=(G*m1*m2)/r^2
=(6.67x10^-11*.7*70000)/2.1^2)
=7.4*10^-7 N
b. f=(G*m1*m2)/r^2
=(6.67*10^-11*.7*70000)/1^2
=3.29*10^-6
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