The formula mass of Na2S is
a. 55.1 u.
b. 30.1 u.
c. 78.1 u.
d. 57.1 u.
c
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A 15-?F capacitor and a 30-?F capacitor are connected in series, and charged to a potential difference of 50 V. What is the resulting charge on the 30-?F capacitor?
A. 0.70 mC B. 0.80 mC C. 0.50 mC D. 0.60 mC E. 0.40 mC
A fundamental force in nature is the
a. strong interaction. b. weak interaction. c. electromagnetic interaction. d. gravitational interaction. e. all of the above
Free Fall: Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s. What was the speed of the ball at launch? Neglect air resistance.
A. 11 m/s B. 23 m/s C. 34 m/s D. 45 m/s E. 48 m/s
A 100 W lightbulb has an energy efficiency of 5%. It is turned on for one minute. Its total energy output during this minute is
A) 6000 J. B) 300 J. C) 5700 J. D) impossible to determine because we don't know the voltage. E) impossible to determine because we don't know the power.