The most distant stars we can measure stellar parallax for are approximately
A) 50 parsecs away.
B) 500 parsecs away.
C) 5,000 parsecs away.
D) halfway across the Milky Way Galaxy.
E) in the Andromeda Galaxy.
B
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Using a lever to move a rock reduces the force a person must exert. What does it do to the work the person must do?
a. it reduces the work also c. the work increases b. the work stays the same d. none of the above
When the distance between the two charges is doubled, the force between them is
A) doubled. B) quadrupled. C) reduced by a factor of 3. D) reduced by a factor of . E) reduced by a factor of 4.
Ultraviolet radiation from a star
a. will not penetrate Earth's atmosphere and reach the ground. b. has a wavelength that is longer than the visible light emitted by the star. c. has a wavelength that is shorter than the x-rays emitted by the star. d. a and b e. b and c
When a gas is so dense that most of its electrons are not free to change their energies, it is called _______________
Fill in the blank(s) with correct word