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(a) Find the angular acceleration.

rad/s2

(b) Find the average angular velocity of the turntable.

rad/s

(c) Find the number of revolutions it makes before stopping.

rev

For Part A I did:

omega = omega initial + alpha * t

omega = alpha * t

omega/t = alpha

(33.3 rev/min) / (26s) * (2Pi rad) / (1 rev) * (1 min) /(60s)

= .1341218402 rad/s^2 = approx .13 rad/s^2

but this is wrong.

For Part C:

displacement = omega initial + 1/2 alpha * t^2

= 1/2(.1341218402 rad/s^2)(26s)^2

=45.33318199 approx = 45 revolutions.

For Part B is it taking the average of initial omega velocity and final omega velocity?