Which of the following types of galaxies are closest to being spherical in shape?
A) spirals
B) ellipticals
C) irregulars
B) ellipticals
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Doppler Effect: A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in the air is 343 m/s.
A. 68 Hz B. 69 Hz C. 70 Hz D. 71 Hz E. 72 Hz
As you crawl toward the edge of a large freely-rotating horizontal turntable in a carnival funhouse, the angular momentum of you and the turntable
A) decreases. B) increases. C) remains the same, but the revolutions per minute decrease. D) decreases in direct proportion to your decrease in revolutions per minute. E) none of these
List and describe four differences between Jovians and Terrestrials
What will be an ideal response?
An AC power generator produces 27 A (rms) at 4730 V. The energy is transmitted through a long-distance power line, which has a total resistance of 173 ?. What percentage of the power delivered by the generator is dissipated as heat in the long-distance line if a step-up transformer is not used?
a. 1% b. 20% c. 31% d. 99% e. 98%