Young children that need glasses are rarely prescribed bifocals. Why?
a. They are almost always nearsighted.
b. They are almost always farsighted.
c. They have considerable accommodation power.
d. Parents don't go for the additional expense.
c
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The magnetic field lines inside a bar magnet go in what direction?
A. from south pole to north pole B. from north pole to south pole C. from side to side D. There are no magnetic field lines inside a bar magnet.
Which force has the smallest magnitude?
A. 
B. 
C. Both and (which are equal)
D.
E. 
Determine the amount of energy carried in 2.0 m of a 4.6-mW He-Ne laser beam if the cross-sectional area of the beam is 4.1 × 10^?6 m2
a. 1.4E–10 J b. 4.9E–12 J c. 3.1E–11 J d. 6.1E–8 J e. 1.0E–11 J
The process of photosynthesis is important because it
A) converts carbon and water to hydrocarbon and free oxygen. B) contributed to the development of an ozone layer. C) is an energy source that drives the geologic process. D) allowed increased infiltration of solar energy.