Which statement best describes the greenhouse effect?
a. infrared radiation escapes into space
b. ultraviolet radiation enters a planet's atmosphere producing a green haze
c. visible radiation is trapped by the atmosphere.
d. infrared radiation is trapped by the atmosphere.
e. oxygen escapes from the atmosphere.
d
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If a transparent material has an index of refraction of 1.67, what is the speed of light in the material?
What will be an ideal response?
Two wheels with fixed centers are in contact with each other and rotate without slipping. Wheel A has a radius of 12.0 cm and is rotating with an angular speed of 35.0 rad/s. Wheel B has a radius of 17.0 cm. What is the angular speed of wheel B?
A) 49.6 rad/s B) 24.7 rad/s C) 5.83 rad/s D) 4.97 rad/s E) 12.4 rad/s
The amount of energy consumed in one day in your home town could be measured in units of
A) watts. B) horsepower. C) joules. D) newtons. E) either watts or joules.
An object is in front of a concave spherical mirror, and its image is 4.0 cm behind the mirror. If the focal length of the mirror has a magnitude of 5.0 cm, where is the object?
A) 2.2 cm in front of the mirror B) 2.2 cm behind the mirror C) 9.0 cm in front of the mirror D) 1.0 cm behind the mirror