The gravitational attraction between two objects with masses m1 and
m2, separated by distance
F=Gm1m2/x2, where G is the
How much work is done by gravity when the separation changes from x1 to
If one mass is much greater than the other, the larger mass
stays essentially at rest while the smaller mass moves toward
it. Suppose a 1.5kg1013 kg
comet is passing the orbit of Mars,
heading straight for the 1.99kg1030 kg sun at a speed of
m/s104 G. What will its speed be when it crosses the orbit of Mercury?
The orbit of Mars is 2.28m/s108 , the orbit of Mercury is 5.79km107 , and
= 6.67km10-11 .