The pressure at the bottom of a glass filled with water (? = 1 000 kg/m3) is P. The water is poured out and the glass is filled with ethyl alcohol (? = 806 kg/m3). The pressure at the bottom of the glass is now
1.smaller than P.
2.equal to P.
3.larger than P.
4.indeterminate.
1
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Force on a Moving Charge: Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure. What are the signs of the charges of these three particles?
A. 1 is neutral, 2 is negative, and 3 is positive. B. 1 is neutral, 2 is positive, and 3 is negative. C. 1 is positive, 2 is neutral, and 3 is negative. D. 1 is positive, 2 is negative, and 3 is neutral. E. 1 is negative, 2 is neutral, and 3 is positive.
Rainbows are not usually seen as complete circles because
A) the ground is usually in the way. B) they are actually elliptical. C) they have no bottom part. D) raindrops are not perfectly round. E) rainbows are arched shaped.
When bringing water to a boil in the mountains, the time needed to reach the boiling point is
A) less than at sea level. B) more than at sea level. C) the same as at sea level.
A valid unit for momentum is which of the following?
a. kg/m/s2 b. kg/m2 c. kg/m/s d. N/m