150 g of liquid nitrogen at its boiling point of 77.0 K is stirred into a beaker containing 510 g of 18.0°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? The heat of vaporization of nitrogen is 48.0 cal/g and that of water is 80.0 cal/g
a. none
b. 21 g
c. 42 g
d. 11 g
e. 63 g
a
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When the flow of air over an object is laminar, ________ drag is created on the object.
Fill in the blank(s) with the appropriate word(s).
The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. D. B. E. C. F. D. G. E. H.
How should we expect the Milky Way's interstellar medium to be different in 50 billion years than it is today?
A) The total amount of gas will be about the same, but the percentage of elements heavier than hydrogen and helium will have risen from the current 2% to more than 50%. B) The total amount of gas will be much greater, since many stars will undergo supernovae between now and then. C) The total amount of gas will be much less than it is today. D) Thanks to the recycling of the star-gas-star cycle, the interstellar medium should look about the same in 50 billion years as it does today.
An RLC series circuit has a 400
resistance, a 2.50 mH inductor, and a capacitor. If the circuit is in resonance at 30.0 kHz and is attached to a 20 mV rms power supply, what is the rms current?
A. 60
A
B. 40A
C. 30A
D. 50A
E. 25A