Suppose that Nolan Ryan stands on the surface of the moon and throws a baseball horizontally. If the baseball has a high enough speed and does not strike any mountain, it can orbit around the moon and, after completing the orbit, strike Nolan from behind. The mass of the moon is mm = 7.35×(10*22power kg), and its radius is rm = 1740 km. The gravitation constant G = 6.67×10(-11power) Nm2/kg2.(adsbygoogle = window.adsbygoogle || []).push({});

a) Find the speed at which Nolan must throw the ball for such a circular orbit? V= ms

(b) How long (in hours) does the ball take to complete one orbit? T= hrs

is the equation V=G*R? if so i used 7.35*10to the 22nd power * 6.67 *10 to -11 power?

i got 4.90245e12, and it said i was wrong.

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Moon physics problem

**Physics Forums | Science Articles, Homework Help, Discussion**