Consider two copper wires. One has twice the length of the other. How do the resistivities of these two wires compare?
A) The longer wire has twice the resistivity of the shorter wire.
B) Both wires have the same resistivity.
C) The longer wire has four times the resistivity of the shorter wire.
D) The shorter wire has twice the resistivity of the longer wire.
B
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According to Kepler's 3rd law, we expect:
A. A more distant planet, e.g. Jupiter, to spin about its axis faster than the Earth B. A more distant planet to spin about its axis slower than the Earth C. An interior planet, e.g. Venus, to spin about its axis faster than the Earth D. none of the above
How does the wavelength (in a vacuum) of a high-frequency electromagnetic wave compare with a low-frequency electromagnetic wave?
A) it is impossible to tell because frequency and wavelength are not related B) the lower-frequency wave has the longer wavelength because frequency and wavelength are inversely proportional to each other C) the two waves have the same wavelength because the wavelengths of all electromagnetic waves are the same D) the higher-frequency wave has the longer wavelength because frequency and wavelength are directly proportional to each other
Two astronauts, of masses 60. kg and 80. kg, are initially at rest in outer space. They push each other apart. What is their separation after the heavier astronaut has moved 12. m?
A) 21. m B) 24. m C) 16. m D) 9. m E) 28. m
According to the following balanced chemical equation, if you want to generate two moles of H2O, how many moles of O2 do you need?
2 H2 + O2 ? 2 H2O A) 1 B) 2 C) 1/2 D) 4 E) 6.022 × 1023