The ozone layer
a. reflects all EM waves
b. reflects high frequency radio waves
c. reflects low frequency radio waves
d. is responsible for the greenhouse effect
e. absorbs ultraviolet light in sunlight
E
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The relative permittivity is also called the _________constant.
Fill in the blank(s) with the appropriate word(s).
Work-Energy Theorem: You slam on the brakes of your car in a panic, and skid a certain distance on a straight level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?
A. It would have skidded 4 times farther. B. It would have skidded twice as far. C. It would have skidded 1.4 times farther. D. It would have skidded one half as far. E. It is impossible to tell from the information given.
Relative Velocity: A swimmer heading directly across a river that is 200 m wide reaches the opposite bank in 6 min 40 s. During this swim, she is swept downstream 480 m. How fast can she swim in still water?
A. 0.50 m/s B. 0.80 m/s C. 1.2 m/s D. 1.4 m/s E. 1.8 m/s
The horizontal component of the buttressing force at the base of a pointed arch is
A) less than that of a rounded arch. B) equal to that of a rounded arch. C) greater than that of a rounded arch. D) zero in magnitude.