One main type of feldspar that contains potassium is
a. quartz.
b. orthoclase.
c. plagioclase.
d. pyrite.
b
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A radioactive isotope is
A) an unstable nucleus that gives off radio waves B) a nucleus that formed from the fusion of two other nuclei C) a stable nucleus that is formed from the fission of a large unstable nucleus D) an unstable nucleus that spontaneously breaks apart
The radius of the earth is R. At what distance above the earth's surface will the free-fall acceleration be 4.9 m/s2?
A) 0.41 R B) 0.50 R C) 1.00 R D) 1.41 R E) 0.25 R
The magnitude of the drag force on a 20.0-kg object is proportional to its speed. The object has a terminal velocity 80 m/s. What is the magnitude of the drag force on the object when it is falling with a speed 30 m/s?
A) 196 N B) 7.50 N C) 15.0 N D) 73.6 N E) 42.7 N
When discharging a battery, the terminal voltage is ________ the battery emf
A) more than B) less than C) equal to D) zero, as is