Rank these planets in order of the strength of the greenhouse effect on the planet, from the least to the greatest
A) Mars, Mercury, Earth, Venus
B) Mars, Earth, Venus, Mercury
C) Mercury, Venus, Earth, Mars
D) Mercury, Earth, Mars, Venus
E) Mercury, Mars, Earth, Venus
E
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What is the purpose of a "star shade" in efforts to directly detect extrasolar planets?
A) The star shade blocks light from the central star, so planets can be seen. B) The star shade cools the star, so it does not emit so much contaminating light. C) The star shade keeps the telescope cooler, so it does not emit as much infrared light. D) The star shade changes the wavelength of starlight, so it is easier to distinguish from planet light. E) The star shade separates starlight from planet light based on temperature.
RC Circuits: A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is a correct statement about the circuit?
A. The capacitor charges to its maximum value in one time constant. B. The capacitor charges to its maximum value in two time constants. C. The potential difference across the resistor is always equal to the potential difference across the capacitor. D. Current flows through the circuit even after the capacitor is essentially fully charged. E. Once the capacitor is essentially fully charged, there is no current in the circuit.
The frequency of a body oscillating from a spring on the Moon is___________ the frequency of the same body oscillating from the same spring on Earth
a. the same as b. larger than c. smaller than d. not related to e. depending on the mass, smaller or larger than
The Sun appears to rotate only because Earth is revolving about the Sun
a. True b. False Indicate whether the statement is true or false