Suppose you find an X-ray binary system that shows X-ray bursts. Is it possible that this system consists of a red giant and a black hole? Why or why not?
What will be an ideal response?
No. X-ray bursts occur when accumulating material on the surface of a neutron star suddenly undergoes nuclear fusion. This cannot happen for a black hole because it has no "surface".
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Presuming that it takes several billion years of complex live to evolve in a stable environment, the stars most likely to currently have inhabited planets are
a. G to K main sequence stars. b. B to A main sequence stars. c. G to K giants. d. white dwarf stars e. neutron stars.
The dark area stretching from the center of this picture to the upper right is about 50 light-years long and lies in the plane of the Milky Way Galaxy. What is it?
A) a star-forming cloud B) a region of the galactic plane in which there are few stars C) the expanding remains of a supernova D) a black hole
The letter N is symmetric (in the sense defined in this chapter) for rotations around an axis going through its center that points in which of the following directions?
A. 
B. 
C. Perpendicular to the plane of the letter
D. A and C
E. A, B, and C
A 2.0-?F capacitor in series with a 2.0-k? resistor is connected to a 60-Hz AC source. Calculate the impedance of the circuit
a. 1500 ohms b. 1800 ohms c. 2100 ohms d. 2400 ohms e. 8600 ohms