For a gas at thermal equilibrium the average speed v, the most probable speed vp, and the root-mean-square speed vrms are in the order:
A. vp < vrms < v Ans: D. Vp
B. vrms < vp < v
C. v
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In Einstein's special theory of relativity, there is one basic principle [or assumption, or law] that seems very odd to our intuitions, and that is responsible for the odd nature of Einstein's conclusions. This basic principle is
A) the idea that all motion is merely relative motion, i.e., that it is impossible to determine how fast you are moving without measuring against something outside your laboratory. B) E = mc2. C) the idea that mass is relative, and is larger when it is moved faster. D) relativistic length contraction. E) the idea that light has the same speed for all nonaccelerated observers.
Which of the following is NOT a guidelines for optimizing multimedia for efficient web delivery?
A. Include only high-bandwidth versions. B. Inform the visitor of and provide links to necessary plug-ins. C. Provide options for full-screen viewing of videos or animations. D. Break audio and video files into short segments to create smaller files.
How did Brahe measure highly accurate planetary positions?
A) By careful measurements of the brightness of the planets, as seen from Earth. B) With larger and more elegant sighting instruments. C) By his invention of the technique know as triangulation (measuring the distance between 2 points, and measuring 2 angles, to determine the distance to a 3rd point). D) With the recently-invented telescope. E) With a new type of telescope that used mirrors instead of lenses.
The atmosphere is divided into several layers. The troposphere is the
A) lowest and thickest layer, where Earth's weather occurs. B) lowest and thinnest layer, where Earth's weather occurs. C) atmosphere's third and thickest layer. D) lowest and least dense layer in the atmosphere, where Earth's weather occurs.