4-62. An
astronaut in training is spinning around in a device that rotates at
30 revolutions per minute. (a) If the astronaut is 7.5 m from the
centre
of the device, what is the magnitude of the centripetal acceleration?
(b)
Express the answer in terms of "g," the magnitude of the acceleration
due
to gravity. [Ans. (a) 74 m/s2 (b) 7.6 g]
The
expression for centripetal acceleration is:
(B) ac
= 4p2r/T2