The temperature of black holes is estimated to be ________.
A. hotter than a white dwarf
B. hotter than 1 million degrees
C. less than 1 millionth of a degree
D. hotter than the Sun
E. Black holes do not have temperature.
Answer: C
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What is the primary reason why a Pluto flyby mission would be cheaper than a Pluto orbiter?
A) The flyby can use less expensive cameras than the orbiter. B) The flyby is easier to design than the orbiter. C) The fuel needed for an orbiter to slow down when it reaches Pluto is very expensive in and of itself. D) The fuel needed for an orbiter to slow down when it reaches Pluto adds a lot of weight to the spacecraft. E) The question is incorrect; in general, orbiters are cheaper than flybys.
Which of the following is not a fundamental force?
A) strong force B) weak force C) degeneracy pressure D) electromagnetic force E) gravity
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
When three vectors, 
, 
, and 
are placed head to tail, the vector sum + + = 0. If the vectors all have the same magnitude, the angle between the directions of any two adjacent vectors is
A. 30°
B. 60°
C. 90°
D. 120°
E. 150°
The average distance from Earth to the sun is 1 AU
Indicate whether the statement is true or false