# Newton's second law and centripetal forces

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• November 4th 2008, 12:31 PM
grrl88
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.(Headbang)
• November 4th 2008, 02:36 PM
skeeter
$F_c = \frac{mv^2}{r}$

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