According to the special theory of relativity, which of the following happens to the size of the time interval between two events occurring in an inertial frame of reference as the frame's velocity with respect to the observer increases?
a. interval decreases
b. interval vanishes to zero when velocity equals half speed of light
c. interval increases
d. interval remains constant
C
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For an ideal gas of a given mass, if the pressure remains the same and the volume decreases:
a. the average kinetic energy of the molecules decreases. b. the average kinetic energy of the molecules stays the same. c. the average kinetic energy of the molecules increases. d. Nothing can be determined about the molecular kinetic energy.
Magnetic Field of a Long Wire: A vertical wire carries a current vertically downward. To the east of this wire, the magnetic field points
A. north. B. east. C. south. D. down.
An alpha particle is
a. a neutral helium atom. b. any positively charged nucleus. c. an x-ray. d. None of the above.
How fast do the fastest pulsars spin?
A: About 1200 times per second (twice as fast as a blender can go) B: About 600 times per second (fastest speed on a blender) C: About 300 times per second (half the top speed of a blender) D: About 60 times per second E: Exactly once per second, like clockwork