Two rods of the same length and diameter are made from different materials. The rods are to connect two regions of different temperature so that energy will transfer through the rods by heat. They can be connected in series, as in figure a, or in parallel, as in figure b. In which case is the rate of energy transfer by heat larger?
2
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LC Circuits: What inductance is needed in series with a 4.7-?F capacitor so the circuit will oscillate at a frequency of 10 kHz?
A. 21 ?H B. 54 ?H C. 4.7 mH D. 5.4 mH
To create the above spectra, which of the following is NOT true?
a. A dense gas is excited and the light produced is over all wavelengths.
b. A low-density gas is excited and the light produced is over discrete wavelengths.
c. Light from a low-density gas passes through a warm, dense gas and the light that is produced is at all wavelengths except for a few discrete wavelengths.
d. All of the other choices are not true.
Which of the following statements is false?
a. The majority of surface rocks are igneous. b. The study of rocks is called petrology. c. Rocks are classified as igneous, sedimentary, or metamorphic. d. Rocks are composed of one or more minerals.
An explorer walks into a lab in a science building. She has a compass in her hand and finds that the south pole of her compass points toward the room's East wall when she is nearer that wall and toward the west wall when she is nearer that wall. You could explain this if magnetized metal had been installed in the East and West walls with North poles pointing into the room. If no magnetic material
was installed in the North or South walls of the room, she would expect that a. the south pole of the compass would tend to point toward those walls. b. the north pole of the compass would tend to point toward those walls. c. the compass needle would not point in any particular direction. d. the north pole of the compass needle would tend to point toward the centers of those walls, but the south pole would tend to point toward the sides of those walls. e. the south pole of the compass needle would tend to point toward the centers of those walls, but the north pole would tend to point toward the sides of those walls.