All Questions
1
question
1
vote
3
answers
1k
views
Does it take energy (in joules) to keep the moon in orbit around the Earth?
If energy is force times distance and I use the Newtonian formula to calculate the force between the earth and the moon
$$ F=\frac{G m_1 m_2}{r^2} , $$
then multiply it by the circumference of the ...