Suppose you see two stars: a blue star and a red star. Which of the following can you conclude about the two stars? Assume that no Doppler shifts are involved. (Hint: Think about the laws of thermal radiation.)
A) The red star is more massive than the blue star.
B) The blue star is more massive than the red star.
C) The blue star is farther away than the red star.
D) The blue star has a hotter surface temperature than the red star.
E) The red star has a hotter surface temperature than the blue star.
D
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A 1-pound ball and a 100-pound ball are dropped from a height of 10 feet at the same time. In the absence of air resistance
a. the 100-pound ball hits the ground first b. There's not enough information to determine which ball hits the ground first c. the 1-pound ball hits the ground d. first the two balls end in a tie
When mechanical work is done on a system, an increase normally occurs in its
A) internal energy. B) temperature. C) both of these D) neither of these
Today, the idea that everything is made of atoms should be classified as
A) a certainty. B) a fact. C) Both of the above. D) a theory. E) a hypothesis.
Describe the three sources of internal heat of the terrestrial planets.
Fill in the blank(s) with the appropriate word(s).