When an earthquake occurs, the location on Earth's surface above the point of initial energy release is called the earthquake's
a. fault line.
b. focus.
c. epicenter.
d. none of the above.
c
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Suppose the distance to a star was doubled but everything else about the star stayed the same. What would happen to the star's luminosity and apparent brightness?
A) Luminosity is decreased by a factor of four and the apparent brightness is decreased by a factor of four. B) Luminosity is decreased by a factor of two and the apparent brightness is decreased by a factor of two. C) Luminosity remains the same, but the apparent brightness is decreased by a factor of two. D) Luminosity remains the same, but the apparent brightness is decreased by a factor of four. E) Luminosity is decreased by a factor of four, but the apparent brightness remains the same.
A 2.0-kg object has a velocity of 
m/s at t = 0. A constant resultant force of 
then acts on the object for 3.0 s. What is the magnitude of the object's velocity at the end of the 3.0-s interval?
A. 9.2 m/s B. 6.3 m/s C. 8.2 m/s D. 7.2 m/s E. 7.7 m/s
The metric system is a(n)______________ system
Fill in the blank(s) with correct word
If three samples have the half-lives listed below, which sample would remain radioactive the longest?
A) a sample with a half-life of 20 minutes B) a sample with a half-life of 20 hours C) a sample with a half-life of 20 years D) a sample with a half-life of 20 million years E) none of the above