Two 4.0-? resistors are connected in parallel, and this combination is connected in series with 3.0 ?. What is the equivalent resistance of this system?
A) 1.2 ?
B) 5.0 ?
C) 7.0 ?
D) 11 ?
B
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If 2.0 kg of water at 0°C is to be vaporized, how much heat must be added?
A) 1080 cal B) 1080 kcal C) 1140 cal D) 1280 cal E) 1280 kcal
A viscous fluid is flowing through a small tube at a rate of 0.200 
If the pressure difference between one end of the tube and the other is doubled, the length is halved and the radius is also doubled, then what is the rate of flow of the fluid?
A. 9.2 
B. 10.2
C. 12.8
D. 13.4
E. 14.6
Which of the following is not a characteristic of the seasons on Mars?
A) Global winds tend to blow from the summer pole toward the winter pole, sometimes initiating global sand storms. B) The polar caps shrink in summer and grow in winter. C) As on Earth, the seasons are caused primarily by axis tilt and orbital distance has virtually no effect. D) The seasons last almost twice as long on Mars as on Earth.
Tycho failed to detect ______ for the nova of 1572 indicating it was ______
a. parallax; beyond the orbit of Earth's Moon b. parallax; inside the Earth's atmosphere close to Earth c. light; beyond the orbit of Earth's Moon d. light; inside the Earth's atmosphere close to Earth