A dictator has built a bunker for his use in emergencies. Its dimensions are shown below. When it floods to ground level during a tropical storm, the gauge pressure at point A, in Pa, is
a.
3.92 × 105.
b.
4.90 × 105.
c.
5.39 × 105.
d.
5.88 × 105.
e.
6.89 × 105.
d
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The gas motions within granules on the solar surface are
a. upward in the centers of some cells and downward in others; the gas cools as it passes between individual granules. b. actually motionless. The dark regions are absorption features from gases in the photosphere. c. upward in the bright cell centers and downward around the darker edges. d. downward in the bright cell centers and upward around the darker edges.
If you want to design a phototube that ignores all visible light, what should its cathode’s work function be?
A. Below 1.77 eV B. Any value between 1.77 eV and 3.1 eV C. Some specific value between 1.77 eV and 3.1 eV D. Above 3.1 eV E. Some other value or range (specify)
The ionosphere is a layer of ionized gas that is
A) above the exosphere. B) between the thermosphere and the exosphere. C) within the thermosphere. D) within the stratosphere. E) within the troposphere.
The classification of stellar spectra started with the amount of hydrogen in the star's spectrum; however, now a better scheme uses the star's _____
a. mass b. diameter c. radius d. temperature e. luminosity