The cosmic background radiation corresponds to a temperature of about
A) 1.4 K. B) 4.9 K. C) 2.7 K. D) 3.8 K. E) 5.5 K.
C
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Which Terrestrial planet has the combination of most rapid rotation, liquid interior, and strongest magnetic field?
a. Venus b. Mercury c. Earth d. Mars
Lise Meitner was
A) one of the discoverers of radioactivity. B) a leader in developing the world's first nuclear reactor. C) discoverer of the ozone hole over the southern polar region. D) one of the discoverers of nuclear fission. E) one of the discoverers of nuclear fusion.
A space station of diameter 80 m is turning about its axis at a constant rate. If the acceleration of the outer rim of the station is 2.5 m/s2, what is the period of revolution of the space station?
a. 22 s b. 19 s c. 25 s d. 28 s e. 40 s
A circuit consists of N resistors, all of resistance R, connected as shown below. A potential difference V is applied to the circuit. The equivalent resistance of the circuit is
A.
.B.
C.
.D.
E.