Which of the following is thought to have to do with producing a 1 minute long gamma-ray burst?
A. a supernova
B. dark matter
C. a planetary nebula
D. a quasar
E. dark energy
Ans: A. a supernova
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This photo shows gas associated with a protostar. What is this gas doing?
A) It is flowing outward in two opposite directions from the protostar. B) It is gas that is gradually accreting onto the protostar. C) It is part of a protostellar disk in which planets may someday form. D) It is gas blown off the protostar's surface as a protostellar wind.
Venus, which is 95 percent the diameter of Earth, has a(n) _______________ atmosphere
Fill in the blank(s) with correct word
In the figure, the current in a solenoid having no appreciable resistance is flowing from b to a and is decreasing at a rate of 9.6 A/s. The self-induced emf in the solenoid is found to be 8.4 V
(a) What is the self-inductance of the solenoid? (b) Which point, a or b is at higher potential? What will be an ideal response?
Which of the following is closest in size (radius) to a neutron star?
A) Earth B) a city C) a football stadium D) a basketball E) the Sun