If the amount of carbon dioxide in the atmosphere is increasing with time, should we expect an increase in the average global temperature? Explain.
What will be an ideal response?
Answer: Carbon dioxide in the atmosphere contributes to the greenhouse effect. Greenhouse gases allow the energy from sunlight to enter the atmosphere, but trap the re-radiated energy from escaping into space (which keeps the earth warm). However, the greenhouse effect is just one of many factors that affect earth's climate, so it is difficult to predict the impact accurately.
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The calendar we presently use is the ______________ calendar
Fill in the blank(s) with correct word
A 104-? resistor is connected in series with a 14.7-µF capacitor and a 56-Hz, 136-V (rms) line voltage. If electrical energy costs 4.8¢ per kWh, about how much does it cost to leave this circuit connected for 24 hours?
a. 2¢ b. 46¢ c. 200¢ d. 5¢
A year is defined as:
A) the time it takes for Earth to complete a rotation on its axis. B) the time it takes for the Moon to complete an orbit of Earth. C) the time it takes for the Moon to complete a phase cycle. D) the time it takes for Earth to complete an orbit around the Sun. E) the time it takes for the Sun to complete an orbit around Earth.
What makes the North Star, Polaris special?
a) it appears very near the north celestial pole b)it is the brightest star in the sky c) it can be used to determine your longitude on Earth d) it is the star directly on your northern horizon