Physics 441/541: Homework Questions Due April 26th

**1**

Assume that pulsars radiate as magnetic dipoles given by Equation 15.28.

a) Show that, long after formation, a pulsar slows down according to P
proportional to t^{1/2}. (approximately)

b) Using the result from part a), show that the luminosity of the pulsar
decreases approximately as

L proportional to t^{-2}.

**2**

Compute the differential tidal force on a person 3000km from a 10 solar mass black hole. (Assume the person’s mass is 100 kg, and the height is 2 m.

**3**

Problem 15.23