Length Contraction: A spaceship with a constant velocity of 0.800c relative to Earth travels to the star that is 4.30 light-years from Earth. What distance does the space ship travel as measured by a passenger on the ship?
A. 2.58 light-years
B. 3.52 light-years
C. 4.12 light-years
D. 4.30 light-years
Answer: A
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The star Aldebaran is seen today just on the western horizon at 9:38 P.M. Tomorrow night at 9:38 P.M., Aldebaran will be ________.
A. below the horizon B. on the eastern horizon C. on the horizon D. above the horizon E. None of these choices is correct.
A long straight wire is parallel to one edge and is in the plane of a single-turn rectangular loop as shown. If the loop is changing width so that the distance x changes at a constant rate of 4.0 cm/s, what is the magnitude of the emf induced in the loop at an instant when x = 6.0 cm? Let a = 2.0 cm, b = 1.2 m, and I = 30 A
a.
5.3 ?V
b.
2.4 ?V
c.
4.8 ?V
d.
2.6 ?V
e.
1.3 ?V
Approximately what mass ratio is required for a rocket to leave the Earth's gravity?
A) 60 B) 99 C) 25 D) 39
The difference between donor and acceptor atoms in a doped semiconductor is that
a. the donor energy level lies halfway between the valence band and the acceptor level. b. the donor energy level lies near the valence band and the acceptor energy level lies near the conduction band. c. donor energy levels cannot exist unless acceptor energy levels are present. d. the donor energy level lies near the conduction band and the acceptor energy level lies near the valence band. e. the acceptor energy level lies halfway between the conduction band and the donor energy level.