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1. Apr 8, 2015

### Prashant91

1. The problem statement, all variables and given/known data: A centrifuge starts from rest and speeds up at 3400rpm after 50 seconds.

a sample is at a distance of 37.5mm from the centre

1) find the angular acceleration
2) calculate the centripetal acceleration

2. Relevant equations:

v2 / r

v = rω

a = rω2

a=Λω/Λt

3. The attempt at a solution

1) a=Λω/Λt = 3400/60*2∏/50 = 7.12 rad/sec^2

2) ac =v^2/ r = 7.12/ 0.01875 ( 0.01875 is the radius converted to M)

2. Apr 8, 2015

### AlephNumbers

The distance from the center of the circle to a point on the circumference of the circle is the radius of the circle. So wouldn't the radius of the circle be 37.5mm? Which, converted to meters, is .0375?

Last edited: Apr 8, 2015
3. Apr 8, 2015

### BvU

In addition: $v^2$ is not 7.12 rad/s2

4. Apr 8, 2015

### BvU

In addition: $v^2$ is not 7.12 rad/s2