A boulder following a straight-line path at constant velocity has
A) a net force acting upon it in the direction of motion.
B) zero acceleration.
C) no forces acting on it.
D) none of the above
Answer: B
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The primary difference between the special theory of relativity and the general theory of relativity is that the general theory also describes
A) length contraction. B) the nature of gravity. C) time dilation. D) the constancy of the speed of light.
When you blow some air above the upper face of a paper strip, the paper rises. This occurs because
A) the air above the upper face of the paper moves faster, which makes the pressure lower than at the lower face. B) the air above the upper face of the paper moves faster, which makes the pressure higher than at the lower face. C) the air above the upper face of the paper moves slower, which makes the pressure lower than at the lower face. D) the air above the upper face of the paper moves faster but the pressure remains constant. E) the air above the upper face of the paper moves slower, which makes the pressure higher than at the lower face.
To prevent injuries, people should do all of the following EXCEPT _______
Fill in the blank(s) with the appropriate word(s).
Why do white dwarfs have high temperatures?
A. chemical reactions on their surfaces B. heat left over from their formation C. nuclear fusion in their cores D. frictional heating from motions inside the white dwarfs