Lenses can be used to focus sunlight to a small point to burn paper or dry brush. A person demonstrates this using their own eyeglasses as the lenses. From this you can tell that
A. the person is either near- or farsighted but not both.
B. the person is farsighted.
C. the person is both near- and farsighted.
D. the person is nearsighted.
Answer: B
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Two-dimensional momentum conservation works
A. for a few special cases B. for all collisions C. If the momenta are perpendicular to each other D. if the angle between the original momenta is small
Tycho Brahe's extremely accurate measurements of the planetary positions showed that
A) Kepler's theory was wrong. B) both Ptolemy's theory and Copernicus's theory were correct. C) both Ptolemy's theory and Copernicus's theory were wrong. D) Copernicus's theory was wrong and Ptolemy's was correct. E) Ptolemy's theory was wrong and Copernicus's theory was correct.
When a substance is exposed to something that has a lower temperature,
a. work is done on it. b. work is done by it. c. heat is transferred from it. d. heat is transferred to it. e. none of the above.
Suppose an object is placed 6.0 cm in front of a lens that has a focal length of 4.0 cm. Where is the image located? What are the magnification and the character of the image?