A sheet of paper can be quickly jerked beneath a container of milk without toppling, which best demonstrates
A) net force.
B) the difference between force and mass.
C) inertia.
Answer: C
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A negatively charged rubber rod is brought near the knob of a positively charged electroscope. The result is that:
A) electroscope leaves will move farther apart B) the rod will lose its charge C) electroscope leaves will tend to collapse D) electroscope will become discharged E) nothing noticeable will happen
The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents stars that are extremely luminous and emit most of their radiation as ultraviolet light?
A) a B) b C) c D) d E) e
For a standing wave on a string, the wavelength must equal:
a. the distance between adjacent nodes. b. the distance between adjacent antinodes. c. twice the distance between adjacent nodes. d. the distance between supports.
Holograms appear three dimensional because
A. they are in color. B. they are transparent. C. they consist of Young double slits. D. they recreate wave fronts as if they came from the original source. E. of their spectral response to refraction.