Circular Motion: Max Revolutions per Second w/ 9g Accel.

[ben2010]

Circular Motion

A spaceman is in training is rotated in a seat at the end of a horizontal rotating are of length 5m. If he can withstand accelerations up to 9g, what is the maximum number of revelutions per second permissable? The acceleration of free fall (g) may be taken as 10m/s.

i would give what i have tried but i have no idea what equation to use?
any ideas?

 

[tiny-tim]

Hi ben2010!

Use the formula for centripetal acceleration …

a = mv²/r = mr²ω