Which of the following is the reason for the leap years?
A) precession of Earth's axis
B) the tilt of Earth's axis
C) the combined effect of the rotation of Earth and its orbit about the Sun
D) Earth year being a non-integer number of Earth days
E) the non-circular orbit of Earth around the Sun
D
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The Doppler radial velocity technique works best for:
A) planets whose orbits are along our line of sight. B) planets whose orbits are perpendicular to our line of sight. C) planets whose orbits are nearly circular. D) planets whose orbits are very eccentric.
Observatory construction sites: Consider the factors that go into selecting telescope construction sites
What type of site would you look for to build a large visible-light observatory? Where would you want to build an X-ray telescope? Would these be the same or different, and why?
In a given reversible process, the temperature of an ideal gas is kept constant as the gas is compressed to a smaller volume. Which one of the following statements about the gas is correct?
A) The gas must absorb heat from its surroundings. B) The gas must release heat to its surroundings. C) The pressure of the gas also stays constant. D) The process is adiabatic. E) It is impossible to predict on the basis of this data.
During the phase change of ice to water, the temperature remains constant. If energy cannot be destroyed, where does the supplied heat energy go?