AC ammeters and voltmeters read:
1.peak-to-valley values
2.maximum values
3.rms values
4.average values
3
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A river flows due east at 2.0 m/s. A boat crosses the 300-m-wide river by maintaining a constant velocity of 15 m/s due north relative to the water. If no correction is made for the current, how far downstream does the boat move by the time it reaches the far shore?
a. 80 m b. 30 m c. 25 m d. 40 m e. 50 m
Why can't x-ray and gamma-ray telescopes use the same designs as visible-light telescopes?
A) X-rays and gamma rays have so much energy that they cannot be reflected in the same way as visible light. B) X-rays and gamma rays do not penetrate Earth's atmosphere. C) X-rays and gamma rays are so intense that they would melt the glass in a visible-light telescope. D) Visible-light telescopes can only reflect light that we see, not any other kind of light.
Blue light will not eject electrons from a certain metal; however, which one of the following may possibly eject electrons from that metal?
a. red c. infrared b. green d. ultraviolet
A gas and a plasma are similar in that they are both
1) fluids, 2) crystalline, 3) covalent, 4) in cohesively bound states, while the principle difference between a gas and a plasma has to do with 5) atomic number. 6) density. 7) pressure. 8) electrical conduction.