If glass expanded more than mercury in a thermometer, then with rising temperature the column of mercury would
A) rise.
B) not change.
C) fall.
Answer: C
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Coulomb's Law: Two tiny particles carrying like charges of the same magnitude are 1.0 mm apart. If the electric force on one of them is 5.0 N, what is the magnitude of the charge on each of these particles?(k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 2.4 × 10-2 C B. 2.4 × 10-8 C C. 4.5 × 104 C D. 2.4 × 10-5 C
Why is it NOT possible to use visible light to investigate the center of our Galaxy?
A. The density of stars toward the Galactic center is so high that it is not possible to see through them. B. The massive black hole located at the center of the Galaxy prevents light from escaping the region. C. Intervening gas locating in the disk of the Galaxy blocks our view of the Galactic center. D. There are no sources of visible light found at the center of the Galaxy.
What percentage of the Solar wind is hydrogen (H)? This is just the ratio of hydrogen to everything expressed as a percentage.
What will be an ideal response?
When a 4-?F capacitor has a potential drop of 20 V across its plates, how much electric potential energy is stored in this capacitor?
A) 0.8 ?J B) 8 ?J C) 80 ?J D) 800 ?J E) 8000 ?J