Dielectric mirrors are made to have extremely high reflectance
a. by stacking thin layers of a single dielectric material on a glass backing so that the reflections from the surfaces of the layers undergoconstructive interference.
b. by stacking thin layers of a single dielectric material on a glass backing so that the reflections from the surfaces of the layers undergo destructive interference.
c. by stacking thin layers of different dielectric materials on a glass backing so that the reflections from the surfaces of the layers undergo constructive interference.
d. by stacking thin layers of different dielectric materials on a glass backing so that the reflections from the surfaces of the layers undergo destructive interference.
c
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An automobile initially moving 72. km/hr jams the brakes and skids to a stop in a distance of 24. meters on a dry pavement but stops in 81.6 m for a wet pavement (the auto weighs 2211. lbs, neglect reaction delay)
(a) What is the coefficient of friction for dry weather? (b) What is the coefficient in wet weather conditions? (c) Is this the STATIC or the KINETIC coefficient?
In a system with two moving objects, when a collision occurs between the objects:
a. the total kinetic energy is always conserved. b. the total momentum is always conserved. c. the total kinetic energy and total momentum are always conserved. d. neither the kinetic energy nor the momentum is conserved.
A skydiver's terminal velocity will be greatest if she falls
A) head first. B) lying flat on her back. C) lying flat on her stomach. D) with her parachute open.
A child grips tightly the outer edge of a playground merry-go-round as other kids push on it to give it a dizzying rotational velocity. When the other kids let go, the horizontal component of the net force on the child points most nearly
A. Inward toward the center of the merry-go-round. B. Outward away from the center of the merry-go-round. C. In the direction of rotation. D. Nowhere: the net force’s horizontal component is zero. E. In some other direction (specify).