If the elliptical orbit of Mercury were more eccentric, its precession rate would be
A) larger than it is now.
B) smaller than it is now.
C) the same as it is now.
D) nonexistent.
Answer: A
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Why did Carl Sagan say that we are star stuff?
A) The composition of most stars (mostly hydrogen and helium) is about the same as the composition of our bodies. B) Cosmic rays reaching Earth from distant astronomical sources may be one source of mutations that help evolution along. C) Nearly every atom from which we are made once (before the solar system formed) was inside of a star. D) Nearly every atom from which we are made was once inside our star, the Sun. E) Sagan thought that all of us have the potential to be movie (or TV) stars like he was.
A river 100 m wide flows due south at 1 m/s. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the east bank
A) due east of its starting point. B) 100 m farther south. C) 141 m farther south. D) none of the above
Mercury's core is unusually ________, which may help explain its magnetic field
Fill in the blank(s) with correct word
When the equation Al + O2? Al2O3 is balanced, the coefficient of O2 is
a. 1 b. 2 c. 3 d. 4