A 20-?F capacitor charged to 2.0 kV and a 40-?F capacitor charged to 3.0 kV are connected to each other, with the positive plate of each connected to the negative plate of the other. What is the final charge on the 20-?F capacitor after the two are so connected?
a. 53 mC
b. 27 mC
c. 40 mC
d. 80 mC
e. 39 mC
b
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The surface of Mercury resembles the Moon's surface in that they are both ________.
A. covered with volcanoes B. eroded by wind C. heavily cratered D. newly resurfaced
Impacts were extremely common in the young solar system but no longer occur today
Indicate whether the statement is true or false
The definitions of an acid and a base as substances that give H+ and OH- ions, respectively, in water were proposed by the chemist named ______________
Fill in the blank(s) with correct word
By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding?
a) all galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going b) all galaxies outside the Local Group are moving away from us, and all are moving away nearly the same speed c) all galaxies contain billions of star and all galaxies have spiral shapes