Spaceman Spiff accidently drops his wristwatch
as he passes a neutron star
of mass M = 3 x 10^(30) kg
and radius R = 20 km.
You may assume that the watch starts from rest
at a large distance from the star.
- Spiff observes his watch as it falls.
At what height above the surface does the
watch's ticking begin to slow down appreciably?
- Estimate the energy released when the watch
strikes the surface of the neutron star.
Express the result in terms of kilotons of TNT:
1 kTon = 4 x 10^(12) Joules.