Neutron stars and pulsars are closely related but not identical. A neutron star is the extremely dense core left behind after a massive star explodes in a supernova. Despite being only about 20 km in diameter, it has a mass greater than that of the Sun. A pulsar is a special type of neutron star that rotates very rapidly and emits narrow beams of radiation from its magnetic poles. When these beams sweep past Earth, they are detected as regular pulses, which is why the object is called a pulsar.
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A pulsar is a rapidly rotating neutron star that emits a radio beam the way a lighthouse emits a light beam. We receive a radio pulse for each rotation of the star. The period T of rotation is found by measuring the time between pulses. The pulsar in the Crab nebula has a period of rotation of T=0.033  s that is increasing at the rate of 1.26 ×10^-5  s / y. (a) What is the pulsar's angular acceleration α? (b) If αis constant, how many years from now will the pulsar stop rotating? (c) The pulsar
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What’s a pulsar? Why does it pulse?
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