I need to find the average acceleration of a gramophone record.
Initial angular velocity, W = 0
Final angular velocity, w = 3.50rad s^-1
angular displacement, 8 = 0.25rad
The equation given by the answer is
a = ( w - W ) / t
the answer is 49.0 rad s-2
The Attempt at a Solution
This is the equation I use
w2 = W2 + 2a8
and I get 24.5rad s-2
But if I multiply it with 2, the angular acceleration will become 49rad s-2
That mean my equation will become
w2 = W2 + a8
Can anyone explain this to me?
Or I use a wrong equation?