If a star collapses to a tenth its size,gravitation at its surface increases by
A)ten.
B)twenty.
C)one hundred.
D)one thousand.
E)more than one thousand.

Question

Quizplus · Accepted Answer

The gravitational force at the surface of a star is inversely proportional to the square of its radius. If the radius decreases to a tenth, the gravitational force increases by the square of 10, which is 100.

If a Star Collapses to a Tenth Its Size,gravitation at Its