A star can be a supernova
A) in predictable cycles of decades.
B) a few times, at unpredictable intervals.
C) only if it can fuse iron in its core.
D) before it reaches the main sequence, if it is massive enough.
E) only once.
E
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The inside of a house is at 20°C on an early morning when the temperature outside is 15°C. The next morning the inside temperature is the same, but the outside temperature is now 5°C. How much does the energy per unit time lost by conduction through the walls, windows, doors, etc., change for the house from the first morning to the second one
a. Since the inside temperature stays the same, the loss is the same both days. b. The loss reduces to 1/3. c. The loss triples. d. The loss increases by 5/278 since we need to use the Kelvin scale for this calculation.
The time for one complete cycle of a periodic process to take place is called
a. amplitude b. frequency c. period d. wavelength e. speed
What is Charon?
A) the largest of Pluto's moons B) the largest known Kuiper belt comet C) the largest known asteroid D) a captured moon of Neptune
When an ice cube in a glass of water melts, the water level
A) rises. B) falls. C) remains the same.