Which of the following screwdrivers would likely be the most effective to loosen a stubborn screw? Assume the size of the driver head is the same in each case
1.one with a handle that is 8 cm long and 2 cm wide
2.one with a handle that is 12 cm long and 2 cm wide
3.one with a handle that is 8 cm long and 4 cm wide
4.They would all loosen the screw just as effectively.
3
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Which of the following best describes rain on Venus?
A) It does not have rain. B) It has sulfuric acid rain that causes erosion on the surface. C) It has sulfuric acid rain in its atmosphere, but the drops evaporate before hitting the surface. D) It has liquid water rain that causes erosion on the surface.
This graph shows how the apparent brightness of an eclipsing binary system changes with time. Which of the four labeled regions represents the system at a time when one star is eclipsing the other?
A) I B) II C) III D) IV E) both II and IV F) both I and II
Consider two long, straight parallel wires, each carrying a current I. If the currents are flowing in opposite directions:
a. the two wires will attract each other. b. the two wires will repel each other. c. the two wires will exert a torque on each other. d. neither wire will exert a force on the other.
Although we know less about dark matter in elliptical galaxies than in spiral galaxies, what does current evidence suggest?
A) Unlike the broad distribution of dark matter in spiral galaxies, elliptical galaxies probably contain dark matter only near their centers. B) Elliptical galaxies probably contain far more dark matter than spiral galaxies. C) Elliptical galaxies probably contain about the same proportion of their mass in the form of dark matter as do spiral galaxies. D) Elliptical galaxies probably contain far less dark matter than spiral galaxies.