5.25 X 10 36 and 2.8 X 10 20 are also INCORRECT. A pulsar is a rapidly rotating

Question

5.25 X 1036 and 2.8 X 1020 are also INCORRECT.

A pulsar is a rapidly rotating neutron star. The Crab Nebula Pulsar in the constellation Taurus has a period of 33.5 × 10-3 s, radius 10.0 km, and mass 2.8 x 1030 kg. The pulsar's rotational period will increase over time due to the release of electromagnetic radiation, which doesn't change its radius but reduces its rotational energy. (Assume the pulsar is rotating in the counterclockwise direction. Indicate the direction with the signs of your answers.) what is the angular momentum of the pulsar (in kg·m2/s)? 1.1210 38 x kg m2/s Suppose the angular velocity decreases at a rate of 10-14 rad/s2, what is the torque on the pulsar (in N·m)? 1.1210"24 × N·m (a) (b)

Explanation / Answer

(A) w = 2pi / T = 187.6 rad/s

I = 2 m r^2 / 5 =1.12 x 10^38 kg m^2

L = I w = 2.10 x 10^40 kg m^2 / s

(b) torque = I alpha

= (1.12 x 10^38) (10^-14)
= - 1.12 x 10^24 N m

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