Superconducting transmission lines may revolutionize the energy distribution system
What will be an ideal response?
This is correct, because the cost of local transmission would be greatly reduced if
transmission wires with no resistance were used. As was seen in question 10, local
transmission accounts for about half the transmission costs.
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A 10-N falling object encounters 10 N of air resistance. The net force on it is
A) 0 N. B) 4 N. C) 6 N. D) 10 N.
How many nonbonding pairs of electrons are in the following molecule?
H—H A) 1 pair B) 6 pairs C) 0 pairs D) 8 pairs E) none of the above
Photons of light can be absorbed by an atom of an element ____
a. if they match one of several possible wavelengths that are absorbed by that element b. if they match one of several possible wavelengths that are absorbed by all elements c. if they match the only particular wavelength that can be absorbed by that element d. if they match the only particular wavelength that can be absorbed by all elements e. no matter what wavelength they have
Resistivity and Temperature: Over ordinary temperature ranges, the resistance of most metals such as copper
A. is independent of the temperature of the metal. B. decreases as the metal gets hotter. C. increases as the metal gets hotter. D. is a maximum at 20°C.