Ten parsecs is about ________
A) 32.6 light-years B) 10 parallax seconds of angle
C) 150 million kilometers D) 10,000 seconds
A
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Addition by 1. Components: Vector 
has a magnitude of 7.0 m and points 30° east of north. Vector 
has a magnitude of 5.0 m and points 30° west of south. The resultant vector 
+ 
is given by
A. 10.0 m at an angle 60° north of east. B. 10.0 m at an angle 30° east of north. C. 2.0 m at an angle 30° north of east. D. 2.0 m at an angle 60° north of east. E. 1.0 m at an angle 60° east of north
Why is Supernova 1987A particularly important to astronomers?
A) It is the nearest supernova to have occurred at a time when we were capable of studying it carefully with telescopes. B) It was the first supernova detected in nearly 400 years. C) It provided the first evidence that supernovae really occur. D) It occurred only a few light-years from Earth.
The apparent size of an object based on the amount of sky it covers is called its ________.
A. shadow-width B. diameter C. angular size D. horizon E. celestial extent
A box of graham crackers is labeled "120 Calories per serving." Assuming this means 120 kcal, and recalling that 4.16 J = 1 cal, the energy of a serving of the graham crackers is about
A. 5 × 104 J. B. 5 × 105 J. C. 4.2 × 103 J. D. 120 J.