What effect or effects would be most significant if the Moon's orbital plane were exactly the same as the ecliptic plane?
A) Solar eclipses would be much rarer.
B) Solar eclipses would be much more frequent.
C) Total solar eclipses would last much longer.
D) both A and C
E) both B and C
B
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Which of the following provides the strongest evidence that halo stars are older, on average, than disk stars?
A) Halo stars orbit in random directions, but disk stars have more ordered orbits. B) There are no blue halo stars. C) There are no red disk stars. D) Theories of galaxy formation tell us that the halo formed earlier than the disk.
Given the distance x that a spring is compressed, what is the potential energy of the spring?
A. 2 kx^2 B. ½ kx C. ½ kx^2 D. 2 kx
A car starts from rest and accelerates at a steady 6.00 m/s2. How far does it travel in the first 3.00 s?
A) 27.0 m B) 18.0 m C) 9.00 m D) 54.0 m E) 36.0 m
In the periodic table, symbols for the elements are arranged according to _____
a. size b. charge c. mass number d. atomic number e. electronegativity gradient