A pulsar is a rapidly rotating neutron star that emits radio pulses with precise synchronization, there being one such pulse for each rotation of the star. The period T of rotation is found by measuring the time between pulses. At present, the pulsar in the central region of the Crab nebula has a period of rotation of T = 0.19000000 s, and this is observed to be increasing at the rate of 0.00000380 s/y. I found the angular velocity to be 33.07 rad/s, I found this by 1/T*2PI Now I need to solve the angular velocity. I tried using the rotational kinematic equation: Wf = Wi + alpha * t where: Wf = angular velocity final Wi = angular velocity initial alpha = angular acceleration t = time Since the period of rotation is increasing by 0.00000380 s/y I added this to 0.19 and then found the Wf by take 1/.19000380 *2PI I used the angular velocity that I already solved for Wi, the 33.07 rad/s then for the time, it would be 1 year right? But does this need to be in seconds? So I plugged these into the equation and solved for alpha (Wf - Wi)/t = alpha (33.068rad/s-33.069rad/s)/31556926s = -3.1689x10^-11 rad/s^2 But this is not the correct answer. Any advice?