# Math Help - Newton's second law and centripetal forces

1. ## Newton's second law and centripetal forces

An astronaut in training rides in a seat that is moved in uniform circular motion by a radial arm 5.40 meters long. If her speed is 15.0 m/s, what is the centripetal force on her in "G's," where one G equals her weight on the Earth? please help me! anyone! a million thanxs before hand.

2. $F_c = \frac{mv^2}{r}$

$\frac{F_c}{mg}$ = value of the centripetal force in "g's"