Use of a parabolic mirror, instead of one made of a circular arc surface, can be used to reduce the occurrence of which of the following effects?
a. spherical aberration
b. mirages
c. chromatic aberration
d. light scattering
a
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A dentist uses a concave mirror (focal length 2 cm) to examine some teeth. If the distance from the object to the mirror is 1 cm, what is the magnification of the tooth?
a. 6 b. 1 c. 4 d. 2 e. 1.5
Based upon what you have learned in this chapter and what you have found in other sources, what are the current advantages and disadvantages of using low-carbon steel and graphite-reinforced epoxy as the chassis material for a low-cost automobile with a high fuel efficiency?
What will be an ideal response?
A 6.0-kg block slides along a horizontal surface. If µk = 0.20 for the block and surface, at what rate is the friction force changing the mechanical energy of the block at an instant when its speed is 4.0 m/s?
a. ?59 W b. ?47 W c. ?71 W d. ?82 W e. +71 W
The cluster method (motions of galaxies in a cluster of galaxies) can be used to determine the cluster's mass
a. luminosity. b. distance. c. mass. d. diameter. e. age.