__________ in Earth's atmosphere absorbs most ultraviolet radiation coming from the Sun
a. Methane b. Three bound oxygen atoms
c. Water vapor d. Carbon dioxide
b
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Graphical Analysis: If the velocity versus time graph of an object is a horizontal line, the object is
A. moving with zero acceleration. B. moving with constant non-zero acceleration. C. at rest. D. moving with increasing speed.
A 1-kg mass at the Earth's surface weighs
A) 1 N. B) 5 N. C) 10 N. D) 12 N. E) none of the above
A heat engine operating at maximum efficiency has an efficiency of 35.0%. The temperature of the hot reservoir is 700 K. What is the temperature of the cold reservoir?
A) 200 K B) 245 K C) 350 K D) 455 K E) 600 K
Microwave radiation is useful in which of the following?
a. sending phone messages b. cooking food c. aircraft navigation d. All of the above are valid choices.