The interior of a refrigerator has a volume of 0.600 m3. The temperature inside the refrigerator in 282 K, and the pressure is 101 kPa. If the molecular weight of air is 29 g/mol,
what is the mass of air inside the refrigerator? The ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K.
A) 560 g B) 500 g C) 750 g D) 270 g E) 140 g
C
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The occasional backward motion of the planets against the background of fixed stars is called _____
A) anterograde motion B) rotation C) oscillation D) retrograde motion
Some astronomers speculate there are as many Trojan asteroids around Jupiter as asteroids in the asteroid belt
a. True b. False Indicate whether the statement is true or false
A compass with its needle pointing north sits on a table. We place a straight wire over the compass parallel to its needle. We then send a conventional current running south to north through the wire. How does the compass needle respond to the current?
A. The compass needle deflects toward the west. B. The compass needle deflects toward the east. C. The compass needle does not do anything. D. The compass needle turns around to point south.
The mass in the figure slides on a frictionless surface. If m = 2 kg, k1 = 800 N/m and k2 = 500 N/m, the frequency of oscillation (in Hz) is approximately
?
?
a.
6.
b.
2.
c.
4.
d.
8.
e.
10.