Gravitational attraction problem

[xbeachbabeee]

Homework Statement

Tom has a mass of 70.0 kg and Sally has a mass of 50.0 kg. Tom and Sally are standing 20.0 m apart on the dance floor. Sally looks up and sees Tom. She feels an attraction. If the attraction is gravitational, find its size. Assume that both Tom and Sally can be replaced by spherical masses.

 

[hage567]

Do you know the equation for gravitational force?

 

[xbeachbabeee]

F = G(MaMb/d^2)

 

[pooface]

Then what is the problem? It looks like just a plug in situation no?

 

[hage567]

All you need to do is put the numbers in. Is there something specific that you're unsure of?

 

[xbeachbabeee]

yeah i was just a little confused as to what "Assume that both Tom and Sally can be replaced by spherical masses" means..