A train sounding its horn is moving toward an observer. The pitch of the horn's sound relative to its normal pitch is
a. lower.
b. sometimes higher and sometimes lower.
c. higher.
d. the same.
c
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A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point is the magnitude of the acceleration at a minimum? Note: Air resistance is negligible
a. just after leaving the center fielder's hand b. just before arriving at the catcher's mitt c. at the top of the trajectory d. acceleration is constant during the entire trajectory
The Doppler technique can be used to estimate the semimajor axis of a planet's orbit by
A) measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law. B) measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity. C) measuring the asymmetries in the velocity curve. D) measuring the amount by which the starlight is reduced when the planet transits.
The amplitude of a wave is 1 meter. The crest-to-trough distance of the wave is
A) 0.5 m. B) 1 m. C) 2 m. D) none of the above
Why do jovian planets bulge around the equator, that is, have a "squashed" appearance?
A) They are much more massive than the terrestrial planets. B) Their large systems of moons and rings gravitationally attract the mass around the equator more. C) Their rapid rotation flings the mass near the equator outward. D) Their internal heat sources exert a pressure against the sides of the planets. E) all of the above