Question

What is the force of gravitational attraction between a 20,000 kg comet and a 7000 kg asteroid which are 1000 m apart?

9.338 x 10-9 N
140,000 N
140 N

Answer 1

Do you know the law of universal gravitation?

Answer 2

yeah
F=Gm1
m2/d2

Answer 3

Yes, it's:\[\Large F_g=G\frac{m_1m_2}{d^2}\]All you need to do is plug in the values you were given.

Answer 4

140000?

Answer 5

Not even close :) Use a calculator

Answer 6

\[\Large F_g=(6.674^{-11}Nm^2kg^{-2}(\frac{(20000kg)(7000kg)}{(1000m)^2}=?\]

Answer 7

9.338 x 10-9 N

Answer 8

Yes :)