James Hutton studied rock formations in his native Scotland to determine that the Earth is much __________ than previously believed, and that catastrophes _________ shaped the landscape.
Fill in the blank(s) with the appropriate word(s).
Answer: older, had not
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A roller skate at rest may have
A) speed. B) velocity. C) momentum. D) energy.
Doppler Effect: A siren emitting sound of frequency 1000 Hz approaches a stationary observer at one-half the speed of sound. The observer hears a frequency of
A. 1000 Hz B. 2000 Hz. C. 500 Hz. D. 1500 Hz. E. None of these.
What is true about Antares?
A: name means "Rival of Mars" B: ˜700 times the size of the Sun C: possibly egg-shaped D: cooler than the Sun E: all of the above
An ideal transformer is used to either increase or decrease the voltage in an AC circuit. When the output voltage is greater than the input voltage of a transformer then
A. the power output is smaller than the power input. B. the power output depends on the ratio of turns in the primary and secondary. C. the power output is the same as the power input. D. the power output is larger than the power input.