Galileo's observation of sunspots showed that ________.
A. planets moved along elliptical orbits around the Sun
B. the Sun was not a flawless sphere
C. the stars could change
D. Earth revolved around the Sun
E. None of these choices is correct.
Answer: B
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An inductor has 200 turns/cm and a cross-sectional area of 1.8 cm2. If its inductance is 32 mH, what is its length?
A. 21 cm B. 15 cm C. 35 cm D. 64 cm E. 72 cm
Even though modern astronomers know that stars are scattered through space at different distances, they still use what scientific model to describe celestial locations in the sky?
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In each cycle an engine gets 50. J from the combustion of fuel and it expels 45. J of heat to the environment at 13.°C. What is the minimum possible temperature at which the 50. J could be taken in?
A) 45°C B) 33°C C) 20°C D) 27°C E) 23°C
As a block of ice at 0°C melts, the block absorbs energy
A) and decreases in temperature. B) and increases in temperature. C) without a temperature change. D) all of the above E) none of the above