The unit of electrical potential, the volt, is dimensionally equivalent to:
a. J?C.
b. J/C.
c. C/J.
d. F?C.
b
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A sound wave in air has an intensity of
The density of air is
and the velocity of sound in air is 331 m/s. The pressure amplitude of the sound wave is
A. 
B. 
C. 
D. 
E. 
A particle (m = 20 mg, q = ?5.0 ?C) moves in a uniform electric field of 60 N/C in the positive x direction. At t = 0, the particle is moving 30 m/s in the positive x direction and is passing through the origin. Determine the maximum distance beyond x = 0 the particle travels in the positive x direction.
A. 25 m B. 20 m C. 15 m D. 30 m E. 60 m
The radio radiation emitted by a radio lobe is mainly synchrotron radiation
a. True b. False Indicate whether the statement is true or false
Why have studies of the geological record not enabled us to determine how life on Earth originated?
A) the first living organisms would have left absolutely no trace of their existence B) life was planted on the Earth by an advanced civilization so there is no evidence in the geological record to find C) the geological record does not extend back to the time that life originated D) the oldest rocks are too deep inside the Earth for us to retrieve