________ paradox asks why the sky is dark at night
Fill in the blank(s) with correct word
Olbers's
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64,200,000,000 is equal to
a. 6.42 × 10^7. b. 6.42 × 10^?7. c. 6.42 × 10^10. d. 6.42 × 10^?10. e. 1.0 × 10^64.2.
A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 100 m from the source is (in dB)
A. 98.5. B. 92.0. C. 91.5. D. 89.6. E. 88.3.
A light aluminum ball and a heavy lead ball of the same size roll down an incline. When they are halfway down the incline, they will have identical
A) kinetic energies. B) potential energies. C) momentum. D) inertias. E) none of the above
The balloon and the magazine shown in this figure are both electrical insulators. Suppose the magazine was replaced by an uncharged metal sheet of the same size as the magazine. The balloon would:
a. be repelled by the metal sheet. b. be attracted by the metal sheet. c. be unaffected by the metal sheet. d. have all electrical effects neutralized by the presence of the metal. e. acquire the opposite charge because of the metal.