Question

An ultracentrifuge accelerates from rest to 100,000 rpm in 2.00 min. What is the tangential acceleration of a point 9.50 cm from the axis of rotation? Your answer should be given in m/sec squared.

Tangential acceleration = angular acceleration * radius

How would I find this?

Answer 1

angular acceleration = (1E5 * 2 * π) / (2 * 60)
... rad/s^2

the radius is ... .095 m

Answer 2

That gives me 497.42...it's wrong

Answer 3

change in angular velocity
= 10^5 * 2 pi radians/60 seconds

change in time = 2 * 60 seconds
so I get
10^5 * 2 *pi /(120*60)

multiply that by .095
or just divide previous answer by 60

Answer 4

is it a significant figure issue?

you've got 5 in your answer

but there is only one in the rpm data