a. Long-playing vinyl records, still used by club DJs, are 12 inchesin diameter

Question

a.
Long-playing vinyl records, still used by club DJs, are 12 inchesin diameter and are played at 33 1/3 revolutions per minute.What is the speed (in m/s) of a point on the edge on such arecord?
(1/2 submissions used)m/s

b.
An astronaut in training rides in a seat that is moved in uniformcircular motion by a radial arm 5.50 meters long. Ifher 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?
(0/2 submissions used)"G's"
(1/2 submissions used)m/s

b.
An astronaut in training rides in a seat that is moved in uniformcircular motion by a radial arm 5.50 meters long. Ifher 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?
(0/2 submissions used)"G's"
(0/2 submissions used)"G's"

Explanation / Answer

if r be the radisu of the disk , if bw theangular velocity        tangential velocity of apoint lies at radial distacne be v                       v = r radius must be converted to meters and numer ofrevelution /sec into rads /sec          1rev /sec =2 rads / sec .                b) centripetal accleration of the astronaut                  a = v^2 /r          v =tangential velocity of the point which is at a radial distance 'r'from the point of axis using the above relation we can sovle for a                                                                          

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