A source emits sound at a fixed constant frequency f.If you run towards the source, the frequency you hear is lower than f
a. True
b. False
Indicate whether the statement is true or false
False
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A. The component of the curl in this direction is positive. B. The component of the curl in this direction is negative. C. The component of the curl in this direction is zero.
The evidence for recent geological activity on Pluto came as a surprise to most scientists, because they did not expect Pluto to retain enough heat to drive such activity. Which of the following best explains why Pluto is so geologically active despite its small size?
A. The activity is driven by tidal heating caused by Pluto’s moons. B. Pluto’s tall mountains built of water ice must be unstable, and when they collapse they can cause geological activity C. The activity is driven by heat from the many impacts that occur in the Kuiper belt. D. The activity involves nitrogen ice, so Pluto does not need much heat to cause this ice to undergo change. E. The activity is driven by the heat of a subsurface ocean.
In essence, the Kepler mission searched for extrasolar planets by ________
A) observing a star carefully enough to notice that it is experiencing a gravitational tug caused by an unseen planet B) identifying spectral lines that look like what we expect to see from a planet rather than a star C) monitoring stars for slight dimming that might occur as unseen planets pass in front of them D) obtaining high-resolution photographs of other star systems
If a force on an object is aimed in the direction of the object's velocity, the force does
a. no work. b. positive work. c. negative work. d. any of the above.