The latent heat of vaporization of water is roughly 10 times the latent heat of fusion of water. The amount of heat required to boil away 1 kg of water is __________ the amount of heat required to melt 1 kg of ice
a. one tenth
b. equal to
c. 10 times
d. unrelated to
c
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A protostar becomes a main sequence star when it ________.
A. starts fusing helium B. starts glowing with infrared light C. starts fusing hydrogen to helium D. starts fusing heavier elements
Astronomers can tell that the Sun moves at about _____
A) 225 km/s B) 240 km/s C) 265 km/s D) 280 km/s
A typical shooting star in a meteor shower is caused by a ________ entering Earth's atmosphere
A) boulder-size particle from an asteroid B) boulder-size particle from a comet C) pea-size particle from an asteroid D) pea-size particle from a comet E) microscopic particle of interstellar dust
An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its launch point. What is the initial (launch) speed of the object?
A. 35 m/s B. 25 m/s C. 30 m/s D. 21 m/s E. 17 m/s