Series/Parallel Circuits: The following three appliances are connected in parallel across an ideal 120-V dc power source: 1200-W toaster, 650-W coffee pot, and 600-W microwave. If all were operated at the same time what total current would they draw from the source?
A. 4.0 A
B. 5.0 A
C. 10 A
D. 20 A
Answer: D
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An isolated black hole in empty intergalactic space would be difficult to detect because
a. there would be no stars behind it whose light it could bend or lens gravitationally b. it could not emit light from inside its event horizon c. no companion stars would be affected by its gravitational field d. no matter would be falling into it to create an x-ray emitting accretion disk e. All of the above
We know that giant stars are larger in diameter than the Sun because
a. they are more luminous but have about the same temperature. b. they are less luminous but have about the same temperature. c. they are hotter but have about the same luminosity. d. they are cooler but have about the same luminosity. e. they have a larger absolute magnitude than the Sun.
One way of stating the principle of relativity is:
A) Light has the same speed for all nonaccelerated observers. B) Experiments conducted entirely within your own lab will come out differently, depending on the state of motion of the lab relative to other reference frames. C) Observers that are accelerated will see light beams move at something other than lightspeed. D) Unless you look outside, you cannot tell how fast you are going. E) The speed of light is relative to the motion of the observer, provided that the observer is not accelerated.
Multiplying a 2-significant-figure number by a 4-significant-figure number and then dividing the product by a seven-significant-figure number yields a number with how many significant figures?
a. 6/7 b. 1 c. 2 d. 13 e. 8/7