Your feet feel warmer on a rug than on a tile floor because the rug
a. is usually warmer than the tile
b. is a better insulator than tile
c. has more internal energy than tile for the same mass
d. all of these
b
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A vertical spring system with a bob having mass M is set into motion with amplitude A. When the bob is pulled instead to move with amplitude 2A, the following can be concluded:
A. The period is half as large as before B. The period is unaffected C. The period is twice as large as before D. The period is 0.7 times as large as before E. The period is 1.4 times as large as before
During a protostar's T Tauri phase, it:
A) begins a period of reduced activity. B) expands dramatically. C) lies on the main sequence. D) may develop very strong winds. E) changes its spin direction.
If you were standing on Earth's equator, where would you look to see the north celestial pole?
A) on your horizon due north B) directly overhead C) toward the ecliptic D) due east
The spectra, such as Ångström found for low-pressure gas in a discharge tube, are of what type?
A. continuous B. discrete C. blackbody D. band E. dark-line