Potential Energy: A 7.0-?C point charge and a 9.0-?C point charge are initially extremely far apart. How much work does it take to bring the 7.0-?C point charge to the point x = 3.0 mm, y = 0.0 mm, and the 9.0-?C point charge to the point x = -3.0 mm, y = 0.0 mm? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 95 J
B. 190 J
C. 63 J
D. 16 J
Answer: A
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Potential Energy: A +7.5-nC point charge is 5.0 cm from a -9.4-µC point charge in your laboratory in California. How much work would you have to do if you left the +7.5-nC charge in the lab but took the -9.4-µC charge to New York City? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
Fill in the blank(s) with the appropriate word(s).
Observer A sees a ruler moving by in a relativistic rocket and measures its length to be LA. Observer B moves along with the rocket and measures the length of the ruler to be LB. What is true about these two length measurements?
A) LA > LB B) LA = LB C) LA < LB D) LA could be greater or smaller than LB depending on the direction of the motion.
Which of the following elements will most likely form an ion with a -2 charge?
A) Na B) S C) Ne D) Mg E) Cl
The Michelson interferometer is a device that may be used to measure:
a. magnifying power of lenses. c. atomic masses. b. light wavelength. d. electron charge.