The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of 44.0 g/mole, is 396 m/s. What is the rms speed of water vapor molecules, with a molecular weight of 18.0 g/mol, at the same temperature as the carbon dioxide?
A) 253 m/s
B) 387 m/s
C) 421 m/s
D) 506 m/s
E) 619 m/s
E
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Prior to 10^–36 seconds, the Universe existed as one unified force
a. True b. False Indicate whether the statement is true or false
The inks used in printing the full-color photos in a common magazine are
A) red, green, and blue. B) red, green, blue, and black. C) magenta, cyan, and yellow. D) magenta, cyan, yellow, and black. E) none of the above
A 15-?F capacitor is charged to 40 V and then connected across an initially uncharged 25-?F capacitor. What is the final potential difference across the 25-?F capacitor?
a. 12 V b. 18 V c. 15 V d. 21 V e. 24 V
A train is traveling due south at a constant
velocity of 86 mi/h. Any unbalanced force acting on the train with respect to the Earth’s surface must be a)zero. b)directed vertically upward. c)directed toward the south. d)directed vertically downward.