What did astronomers expect might cause the expansion of the Universe to slow down?
A.) Friction.
B.) Running out of energy.
C.) Being very old.
D.) The gravitational pull of all the matter in it.
E.) None of the above.
Ans: D.) The gravitational pull of all the matter in it.
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Which gases in Earth's atmosphere strongly absorb ultraviolet radiation?
A. water vapor and carbon dioxide B. ozone and oxygen C. nitrogen and argon D. None of these choices are correct.
Which gases within our atmosphere act as greenhouse gases?
a. water b. carbon dioxide c. oxygen and nitrogen d. all of the above e. a and b
A plane flying horizontally at a speed of 50.0 m/s and at an elevation of 160. m drops a package of supplies. Two seconds later it drops a second package. How far apart will the two packages land on the ground?
A) 100. m B) 67.7 m C) 283. m D) 162. m E) 177. m
At what temperature is the same numerical value obtained in Celsius and Fahrenheit?
a. ?40° b. 0° c. 40° d. ?72°