An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire. What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (?0 = 4? × 10-7 T ? m/
A)
A) 0.0063 T
B) 0.20 T
C) 3.2 T
D) 4.8 T
E) 0.31 T
E
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Pulsars
A) spin very rapidly when they're young. B) are the cause of gamma-ray bursts. C) spin very slowly when they're young, and gradually spin faster as they age. D) generally form from 25 solar mass stars. E) emit radio in all directions.
The Big Bang was an expansion of matter into empty space
Indicate whether the statement is true or false
A 5000-kg freight car collides with a 10,000-kg freight car at rest. They couple upon collision and move at 2 m/s. What was the initial speed of the 5000-kg car?
A) 4 m/s B) 5 m/s C) 6 m/s D) 8 m/s E) none of the above
Why is it difficult to use the method of standard candles to find the distance to galaxies?
A. There are no known standard candles outside of our galaxy. B. Standard candles are too bright to be used for all but the farthest galaxies. C. It is difficult to isolate the light of a single star from the galaxy. D. All of these choices are correct.