When a material is cooled
A. it stays the same size
B. it contracts
C. it expands
D. Some materials contract and some expand.
Answer: D. Some materials contract and some expand.
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In an LC circuit with an inductance of 40 mH and capacitance of 1.2 mF, the maximum charge on the capacitor is 45 mC during the oscillations which occur. What is the maximum current through the inductor during the oscillations?
A) 3.7 A B) 42 A C) 10 A D) 6.5 A E) 2.5 A
Atomic bombs and nuclear power plants both use nuclear fusion
Indicate whether the statement is true or false
A nearsighted person wears contact lenses of refractive power -6.0 D. What is his near point?
A. 6.0 cm B. -6.0 cm C. 17 cm D. -17 cm E. -4.0 cm
Which of the following is a major reason why it so difficult to obtain direct images of extrasolar planets?
A) The light of the planets is overwhelmed by the light from their star. B) Extrasolar planets give off light at different wavelengths than planets in our solar system. C) No telescope is powerful enough to detect the faint light from a distant planet. D) Telescopes are too busy with other projects.