At what temperature in Fahrenheit does water boil?
A. 32 degrees F;
B. 100 degrees F;
C. 212 degrees F;
D. 261 degrees F
Answer: C. 212 degrees F;
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What is postulated to have caused a sudden inflation of the early universe?
A) the energy absorbed by giant quantum fluctuations B) the energy released from the "freezing out" of the strong force from the GUT force C) the energy released from the annihilation of matter and antimatter D) the energy absorbed by the separation of the electromagnetic and weak forces E) the energy released in the fusion of protons and neutrons to produce helium
Transparency of the atmosphere is lowest for radiation of
A) ultraviolet light. B) visible light. C) infrared light.
The room-temperature electrical conductivity of pure silver is 6.8×107 (?·m)-1 , and for pure copper the electrical conductivity is 6.0×107 (?·m)-1 . An alloy is made of 40 vol % copper and 60 vol % silver. Copper and silver form a eutectic phase diagram, with no solubility of copper in silver or of silver in copper at room temperature. Predict the room-temperature electrical resistivity of an alloy made from these materials.
What will be an ideal response?
Titan's surface is mainly composed of _____
A) liquid hydrogen B) ices of hydrogen and water C) liquid helium D) ices of water and methane