Rubber rods charged by rubbing with cat fur repel each other. Glass rods charged by rubbing with silk repel each other. A rubber rod and a glass rod charged respectively as above attract each other. A possible explanation is that
a. any two rubber rods charged this way have opposite charges on them.
b. any two glass rods charged this way have opposite charges on them.
c. a rubber rod and a glass rod charged this way have opposite charges on them.
d. all rubber rods always have an excess of positive charge on them.
e. all glass rods always have an excess of negative charge on them.
c
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FM radio only operates in the frequency range 88 MHz to 108 MHz because
a. higher or lower frequencies are blocked by the ionosphere. b. higher and lower frequencies are not radio waves. c. the government set those limits. d. none of the above
A 5.0-kg mass is suspended by a string from the ceiling of an elevator that is moving upward with a speed which is decreasing at a constant rate of 2.0 m/s in each second. What is the tension in the string supporting the mass?
a. 49 N b. 39 N c. 59 N d. 10 N e. 42 N
The gauge pressure of the water in a swimming pool at 10 ft is __________ the gauge pressure of the water at 5 ft
Fill in the blank(s) with correct word
Which of the following areas have the most massive black holes (those with the highest masses)?
A. where a massive star has died B. in spiral galaxy halos C. in the outer halos of elliptical galaxies D. in X-ray binary stars E. in the centers of spiral galaxies