Why is there a two-day difference in the sidereal and synodic months?
A) The Moon speeds up at perigee, and slows down at apogee.
B) The sidereal day is four minutes shorter than the solar day, and it adds up.
C) The Earth is closer to the Sun during the sidereal month.
D) The Earth is also revolving around the Sun, so the Moon must "catch up."
E) The Moslem lunar year is only 354 days long, on average.
D
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The ? ring eccentricity seems to be caused by the eccentric orbits of Ophelia and Cordelia around Jupiter
a. True b. False Indicate whether the statement is true or false
Alcohol is less dense than water. If alcohol is used to make a barometer at normal atmospheric pressure, the height of the alcohol column would be
A) less than 10.3 m. B) 10.3 m. C) more than 10.3 m.
Which of the following is not consistent with the major hallmarks of science?
A) A scientific model must make testable predictions. B) Science progresses through the creation and testing of models that explain observation as simply as possible. C) Scientific explanations should be based solely on natural causes. D) Science consists of proven theories that are understood to be true explanations of reality.
When an unstable Zr nucleus undergoes alpha decay, the nucleus formed is that of
a. Zr. b. Mo. c. Y. d. Sr. e. Nb.