How long will it take a charged 80-?F capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45-? resistor?
A. 0.92 ms
B. 0.64 ms
C. 0.40 ms
D. 0.19 ms
E. 0.80 ms
Answer: C
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In the H-R diagram a T Tauri star will be located ________.
A. below the main sequence B. near the upper right corner C. on the right-hand side and a little above the main sequence D. near the bottom left corner E. near the upper left corner
Which of the following is the correct electron dot structure for carbon (atomic no. = 6)?
A) a B) b C) c D) d E) e
Which is least expensive-for the same energy delivered?
A. coal B. gasoline C. natural gas D. AAA batteries
As the Moon and Earth pull on one another, the oceans bulge about 1m on opposite sides of the Earth. In Earth's daily rotation, the area that passes the bulge experiences high tide. The time of the high tides fluctuates because
A) not all areas of Earth use daylight savings time. B) while Earth spins on its axis, the Moon orbits the Earth—the timing is a bit off. C) as Earth spins on its axis, the Moon spins on its own axis—the timing is a bit off.