When a 12.0 volt battery is connected to a 6.00 ?F capacitor:
(a) how much energy is stored?
(b) how much charge is stored on the positive plate of the capacitor?
(a) 432 ?J
(b) 72.0 ?C
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Series/Parallel Circuits: When different resistors are connected in parallel across an ideal battery, we can be certain that
A. the same current flows in each one. B. the potential difference across each is the same. C. the power dissipated in each is the same. D. their equivalent resistance is greater than the resistance of any one of the individual resistances. E. their equivalent resistance is equal to the average of the individual resistances.
Consider the following three hypothetical planets orbiting a star with the same mass as the Sun (one solar mass):
Planet X: one Earth mass and 1 AU from the star Planet Y: two Earth masses and 1 AU from the star Planet Z: two Earth masses and 2 AU from the star The shortest orbital period belongs to (Ignore very small differences in orbital period that might be attributed to the planet masses alone.) A) Planet X alone B) Planet Y alone C) Planet Z alone D) Planets X and Y, which have about the same orbital period E) Planets Y and Z, which have about the same orbital period F) all three planets, since they all have about the same orbital period
A 25-mH inductor is connected in series with a 20-? resistor through a 15-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the current when t = 2.0 ms?
A) 0.40 A B) 0.50 A C) 0.60 A D) 0.70 A E) 0.80 A
Geological evidence points to a few very deep "snowball" phases in Earth's history, in which the oceans would have been mostly frozen. How did Earth recover from a snowball phase?
A) The increased ice coverage on Earth's surface absorbed more sunlight than water and rocks, thus gradually heating Earth until the ice melted. B) Life vanished, leading to an increase in CO2, and increased global warming, eventually melting the ice. C) Volcanoes continued to inject CO2 into Earth's atmosphere, increasing the greenhouse effect to the point where ice melted. D) Plate tectonics gradually subducted all the ice below Earth's surface. E) As the Sun aged, it grew brighter and increased Earth's temperature, melting the ice.