Two charges lie on the x axis, +3q at the origin, and ?2q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is
A. 1.0 m.
B. 2.0 m.
C. 2.5 m.
D. 3.0 m.
E. 4.0 m.
Answer: D
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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
If sunlight broke up water molecules in Venus's atmosphere, would the hydrogen atoms es-cape into outer space? Note that Venus's temperature is 740 K. Recall that gas eventually will escape if the average velocity of its atoms is greater than 1/6 times the escape velocity of the planet. The escape velocity of Venus is 10 km/s.
a. No, the average velocity of hydrogen atoms would be 0.8 km/s. b. No, the average velocity of hydrogen atoms would be 3.9 km/s. c. Yes, the average velocity of hydrogen atoms would be 3.9 km/s. d. Yes, the average velocity of hydrogen atoms would be 25 km/s. e. No, the average velocity of hydrogen atoms would be 25 km/s.
One of the most serious 3-D defects that affects the strength of ceramics is the presence of _____________.
Fill in the blank(s) with the appropriate word(s).
One of the absorption lines of hydrogen has a rest wavelength of 656 nm. Suppose you observe this line in four different stars, and find this line at the wavelengths show below. Which wavelength represents the star that is moving toward Earth the fastest?
A) 630 nm B) 656 nm C) 670 nm D) 640 nm