Two objects are thrown from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street? Neglect air
A) The one thrown up is traveling faster.
B) The one thrown down is traveling faster.
C) They are traveling at the same speed.
D) It is impossible to tell because the height of the building is not given.
C
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Which of the following is NOT a kind of geological feature found on the Moon?
A. rille B. scarp C. crater D. maria
Ionization of hydrogen in H II regions is most visible at:
A) 12,367 nm, the Paschen alpha line. B) 656.3 nm, Balmer alpha line for 3-2 electron transition. C) 21 cm in the radio region for the spin-flip of its electron. D) 121.3 nm, the Lyman alpha ultraviolet line for 2-1 electron transition. E) 473.2 nm, the blue-green emission line for 4-2 electron transition.
Quasar spectra often show many absorption lines that all appear to be due to the same electron transition (such as level 1 to level 2 in hydrogen) but that fall at different wavelengths in the spectrum. Why do we think this is the case?
A) We are seeing absorption lines from clouds of gas that lie between us and the quasar, and therefore each cloud has a different redshift. B) Quasars are rotating rapidly, and this rotation produces spectral lines with a wide variety of Doppler shifts. C) The lines fall at different wavelengths because they are produced by different chemical elements. D) No one knows—it remains perhaps the greatest mystery about quasars.
A speed boat requires 80 kW to move at a constant speed of 12 m/s. What is the resistive force of the water at this speed?
a. 2700 N c. 6700 N b. 5300 N d. 7700 N