The Earth's oceans evolved
A) from condensation of water vapor in a hydrogen-oxygen rich atmosphere.
B) from condensation of water vapor from volcanic eruptions.
C) with accumulation of rainfall.
D) as Earth warmed.
Answer: B
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A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500-Hz frequency. At the time, the speed of sound in air is 340 m/s. How many beats per second do the people on the fire engine hear?
A. 0 B. 15 C. 29 D. 63 E. 250
To say that an object is electrically polarized is to say
A) it is electrically charged. B) its charges have been rearranged. C) its internal electric field is zero. D) it is only partially conducting. E) it is to some degree magnetic.
Doubling only the spring constant of a vibrating mass-and-spring system produces what effect on the system's mechanical energy?
A) increases the energy by a factor of square root of two B) increases the energy by a factor of two C) increases the energy by a factor of three D) increases he energy by a factor of four E) produces no change
If two cars are tangled up with each other after an accident that means:
a. since they moved together, the law of conservation of momentum did not apply. b. since they are attached to each other, they stopped moving altogether and the momenta went to zero. c. analyzing the history of the accident and the initial momenta will be easier. d. analyzing the history of the accident and the initial momenta will be more difficult. e. the cars needed to have been going in the same direction to get useful information by examining skid marks.