The force of gravity decreases as the ___ between the masses increases

distance

Explanation:

F=GmM/r^2

if r increases in this equation, F would decrease

for example if r = 1 and increase to 2,

when r = 1, F = GmM

when r = 2 F = GmM/4

GmM < GmM/4

so when r increases F decreases

a. spokes of a wheel.

as indicated in the question radial contains rad, also found in radius, so the fracture's would span the radius.