The earth's northern magnetic pole is located
A)
near Tasmania.
B)
near Antarctica.
C)
at the North Pole.
D)
at the South Pole.
E)
in northern Canada.
E
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You want to swim straight across a river that is 76 m wide. You find that you can do this if you swim at an angle of ? = 28° from the upstream direction at a constant rate of 1.5 m/s relative to the water
At what rate does the river flow? The angle ? is measured from the river bank (directly upstream is ? = 0° while directly across the river is ? = 90°). A) 1.3 m/s B) 0.70 m/s C) 1.6 m/s D) 1.8 m/s
A nitrogen molecule has a diameter of about 0.29 nm. The mean free path of a nitrogen molecule in a tank of dry nitrogen at room temperature and standard pressure is about 0.10 ?m. A tank containing nitrogen at standard temperature and pressure has volume V. If the tank is compressed by means of a piston to 20% of its original volume, what is the mean free path for a nitrogen molecule under the new conditions?
A. 0.089 ?m B. 0.125 ?m C. 0.080 ?m D. 0.112 ?m
Quantum issues often constrain transitions in quantum harmonic oscillators to those where ?n = 1. Consider a spectrum chart (like the one shown in figure Q11.2) for such a system. What would this chart look like?
A. There would be only one emission line.
B. The emission lines would be evenly spaced in energy.
C. The emission lines would become more closely spaced (in energy) as we go to the right.
D. The emission lines would become farther apart (in energy) as we go to the right.
Which fact about Mars is true?
A. There are no volcanoes on Mars. B. No spacecraft has ever landed on Mars. C. There was never water on the surface of Mars. D. It is always warmer than freezing on Mars surface. E. Mars has a thinner atmosphere than Earth does.