Suppose a little bubble of air has gotten into the top of a mercury barometer. If a person uses a barometer in the usual way, the reading of atmospheric pressure will be
A. correct.
B. lower than the actual value.
C. higher than the actual value.
Answer: B
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You whirl a 2-kg body attached to a 1 meter cord around your head in a nearly horizontal circle with a speed of 4 m/s. The tension in the cord is _________
Fill in the blank(s) with correct word
Stored potatoes, beets, and rutabagas freeze at temperatures below zero degrees Celsius (rather than at exactly zero) because
A) they are good radiators of energy. B) they are good absorbers of radiant energy. C) the water in them contains dissolved salts and sugars. D) they are relatively dense. E) all of the above
The extent of the continental shelf, an underwater extension of the continental crust, varies due to fluctuations in sea level. When sea level is higher, the continental shelf
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.
When charging a battery, the terminal voltage is ________ the battery emf
A) less than B) zero, as is C) equal to D) more than