If you move twice as far away from a lawn mower running in an open field, the amplitude of the sound you hear will be ___________ what it was before
a. the same as
b. twice
c. half
d. four times
e. one fourth
c
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Aluminum alloys are readily deformed into shape because they have the _________-centered-cubic crystal structure.
Fill in the blank(s) with the appropriate word(s).
If the Earth's period of rotation doubled, but the period of revolution stayed the same
a. the night would be twice as long. b. the night would be half as long. c. the year would be half as long. d. the year would be twice as long. e. the length of the day would be unchanged
What change slowly occurs during the main-sequence lifetime of a star?
A) As the solar wind blows material into space, the decreasing mass reduces pressure in the core, which in turn reduces the fusion rate and the luminosity. B) As hydrogen is used up in the core, the fusion rate decreases and reduces the luminosity. C) It gathers more gas from interstellar space, increasing its mass and hence the luminosity. D) Its core temperature slowly increases, increasing the fusion rate and hence the luminosity.
Which constellation is this?
A) Andromeda, the Princess B) Pegasus, the Winged Horse C) Orion, the Hunter D) Cepheus, the King E) Draco, the Dragon