Regarding the validity of Ptolemy's and Copernicus' theories:
A) Ptolemy was proven wrong and Copernicus was proven right.
B) they were both good theories, but Ptolemy's point of view ultimately turned out to be more useful.
C) the experimental facts known in Copernicus' time tended to support Copernicus' theory over Ptolemy's.
D) they were both wrong and useless theories.
E) they were both good theories, but Copernicus' point of view ultimately turned out to be more useful.
E
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Radio telescopes have poor resolving power because
a. their diameters are so large. b. the energy they receive is not electromagnetic radiation. c. radio waves have long wavelengths. d. a and b e. none of the above
A baseball is struck by a batter at an angle such that it reaches its maximum height at the location of the pitcher – and just grazes the top of the pitcher’s head (at an elevation of 1.50m above the launch point of the baseball). The pitcher is a horizontal distance of 20.0m from the point at which the ball was struck. What was the launch speed for the baseball?
A. 37 m/s B. 36m/s C. 51m/s D. 27m/s
If Earth's rotation slowed down so that it completed exactly one rotation about its axis in 100 hours (instead of 24), what would be the typical time interval between sunrise and sunset?
A) 50 hours B) 100 hours C) 12 hours D) 25 hours E) 24 hours
Suppose you are aboard a rocket that is orbiting Earth in the low, circular orbit shown. If you want to escape from Earth and head to the Moon or Mars along the "escape" path shown, what do you need to do?
A) Fire the rocket engine in your direction of travel, so that you gain speed. B) The only way to end up on the "escape" path is to first return to Earth, then launch your rocket with escape velocity. C) Turn the rocket around, and fire the engine so that you lose speed. D) Throw some excess supplies overboard, so that your rocket becomes less massive.