A person stands 35.0 m from a flag pole. With a protractor at eye level, he finds that the angle at the top of the flag pole makes with the horizontal is 25.0 degrees
Approximately how high is the flag pole? (The distance from his feet to his eyes is 1.7 m.) A)
10 m
B)
20 m
C)
30 m
D)
50 m
E)
80 m
B
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Intensity of Sound: A certain factory whistle can be heard up to a distance of 2.5 km. Assuming that the acoustic output of the whistle is uniform in all directions, how much acoustic power is emitted by the whistle? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 0.079 mW B. 0.026 mW C. 0.26 mW D. 0.79 mW E. 2.6 mW
Show that the fin heat transfer for a square fin having an adiabatic tip is
How do x-ray measurements help us measure the amount of dark matter in galaxy clusters?
A) The gravity of dark matter causes intracluster gas to be heated to very high temperatures, and the higher the temperature, the stronger the x-ray emission we will detect from the gas. B) Dark matter absorbs x-rays, so we can map the dark matter distribution by looking for absorption lines in x-ray spectra. C) Collisions between dark matter particles emit x-rays, allowing us to map dark matter with x-ray images.
Carbon fibers are made of amorphous carbon and polycrystalline _________whose plates are oriented along the fiber axis.
Fill in the blank(s) with the appropriate word(s).