Which of these waves do NOT require a medium?
a) Ocean waves
b) Seismic waves
c) Sound waves
d) Radio waves
Ans: d) Radio waves
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Study this diagram that summarizes the eras of the universe. Which of the following statements is not true?
A) The electroweak era was the longest lasting of all the eras in the history of the universe. B) The total time during which the universe went through the Planck era, GUT era, electroweak era, and particle era was less than the time it takes you to blink your eyes. C) Whole atoms with both electrons and nuclei were not stable until the universe was about 380,000 years old. D) Most of the helium in the universe was produced before the universe was about five minutes old.
What is the average power dissipation in an RLC series circuit in which R = 177 ?, L = 0.060 H, and C = 8.65 µF driven at resonance by a 163-V (rms) source?
a. 150 W b. 138 W c. 147 W d. 144 W e. 1 370 W
Conversion of Units: Hydraulicists often express rainfall in acre-feet. This is the amount of water required to cover an area of one acre to a depth of one foot. There are 640.0 acres in a square mile, and 5280 feet in one mile. How many cubic feet are there in one acre-foot?
Fill in the blank(s) with the appropriate word(s).
The assumption of isotropy states that
a. the Universe looks the same at all epochs. b. the Universe looks the same from all locations over sufficiently great distances. c. the Universe looks the same in all directions over sufficiently great distances. d. the Universe looks the same at all epochs, the Universe looks the same from all locations over sufficiently great distances, and the Universe looks the same in all directions over sufficiently great distances. e. None of the other choices are correct.