General Astronomy -
Spring
2013
Homework #9 - due April 1
1. (3 pt) Explain the
equivalence principle.
2. (2 pt) What is the
Schwarzschild radius of a 1000 solar mass black hole?
3. (4 pt) The accretion disk around a black hole has a luminosity
of 1032 W. What can one say about the black hole?
4. (6 pt) An AGN
ejects two blobs of matter
moving in diametrically
opposite directions inclined by 30° to our line of sight to the
AGN. Each blob is moving at a speed of 0.95 c relative to
the
AGN. The AGN is at rest relative to us. How fast do
the
blobs appear to move on the sky as seen by us?