A 100. Watt light bulb is powered by 120. v AC, 60. Hz household connection. Determine the rms current and the peak current
What will be an ideal response?
0.833 Amperes rms; 1.18 Amperes peak
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If you are standing at the Earth's North Pole, which of the following would be located at the zenith?
a. The nadir b. The star Vega c. The celestial equator d. The north celestial pole
Why is 21-cm radiation so important to the study of interstellar matter and the Galaxy?
A) It helps locate the galactic core in Sagittarius. B) Emitted by hydrogen, it passes through interstellar dust and lets us to map the entire Galaxy. C) Emitted by carbon monoxide, it passes through interstellar gas and lets us to see places rich in organic molecules around the Galaxy. D) It is emitted by most stars, enabling astronomers to map the entire Galaxy. E) It is emitted only in hot regions of star formation, so the pattern of the spiral arms of the Galaxy can be mapped.
Which of the following not generally thought of as matter?
A) light B) trees C) air D) clouds E) rain
If the world grows more food than it needs, how can there be famines? Explain
What will be an ideal response?