?

SAT® Subject Test in Physics

Free Version

Upgrade subject to access all content

Moderate

Force between Lumps of Clay

SATPHY-JKWQZ5

Two spherical lumps of clay attract each other with some small amount of gravitational force, as explained by Newton's law of universal gravitation.

If I add clay to one lump and to the other so that the mass of one is 5 times as much as before and the mass of the other is 3 times as much as before, and I move the lumps (still spherical) so that their centers are now 4 times as far apart as before, how does the new gravitational force between them compare?

A

The new force is slightly smaller.

B

The new force is slightly greater.

C

The new force is more than 3 times as great.

D

The new force is less than one-third as great.

E

We cannot answer this question without knowing the universal gravitational constant.