If R1 = 10 ?, R2 = 15 ?, R3 = 20 ?, and I = 0.50 A, at what rate is heat being generated in these resistors?
A. 29 W
B. 16 W
C. 22 W
D. 11 W
E. 1.1 W
Answer: D
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Suppose you are aboard a rocket that is orbiting Earth in the low, circular orbit shown. If you want to escape from Earth and head to the Moon or Mars along the "escape" path shown, what do you need to do?
A) Fire the rocket engine in your direction of travel, so that you gain speed. B) The only way to end up on the "escape" path is to first return to Earth, then launch your rocket with escape velocity. C) Turn the rocket around, and fire the engine so that you lose speed. D) Throw some excess supplies overboard, so that your rocket becomes less massive.
An annular solar eclipse occurs
A. when the Moon in its orbit is closest to Earth, and, so not able to cover the complete disk of the Sun. B. every year when the Sun is highest in the sky. C. when the Moon in its orbit is farthest from Earth, and, so not able to cover the complete disk of the Sun. D. None of these choices is correct.
When you weigh yourself on a bathroom scale on a slight incline instead of a level surface, your weight reading on the scale will be
A) less. B) no different. C) more.
Two light bulbs are connected to a battery, one at a time. The bulb that draws more current has the
A) lower resistance, and is brightest. B) lower resistance, but is dimmer. C) higher resistance, and is brightest. D) higher resistance, but is dimmer. E) none of the above