The extent of the continental shelf, an underwater extension of continental crust from shoreline to basin, varies due to fluctuations in sea level. When sea level is lower, the continental shelf is
A) is narrow because less of the continental shelf is exposed.
B) is narrow because less of the continental shelf is submerged.
C) wider because some of the continental land would be submerged.
Answer: B
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What do we mean when we say that a magnetic field has polarity?
A. A planetary magnetic field is aligned with the geographic poles of the planet. B. A planetary magnetic field is strongest at the poles of the planet. C. A magnetic field is able to flip its poles over a long period of time. D. A magnetic field has a north and south "poles" or directions. E. None of these choices are correct.
Two vibrating tuning forks, held side by side, will create a beat frequency of what value if the individual frequencies of the two forks are 306 Hz and 300 Hz, respectively?
a. 606 Hz b. 303 Hz c. 294 Hz d. 6.00 Hz e. 300 Hz
An electric heater draws an average power of 1100 watts when plugged into a 110 V rms outlet. Calculate the resistance of the heater and the rms current.
A. 11 ?, 10 A (rms) B. 110 ?, 10 A (rms) C. 10 ?, 11 A (rms) D. 10 ?, 110 A (rms) E. 0.09 ?, 11 A (rms)
In the nucleus, the maximum number of neutrons in a neutron energy level is (are) ______ and the maximum number of protons in a proton energy level is (are) ______.
A. 1, 1 B. 1, 2 C. 2, 1 D. 2, 2 E. 2, 8