A uniform spherical volume distribution of charge has radius R and total charge Q. A point charge ?q is released from rest at point b, which is a distance 3R from the center of the distribution. When the point charge reaches a, which of the following is true regarding the total energy E?
6
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Addition by 1. Components: Four vectors, 
, 
, 
, and 
, are shown in the figure. The sum of these four vectors is a vector having magnitude and direction 
A. 4.0 cm, along +x-axis. B. 4.0 cm, along -x-axis. C. 4.0 cm, along +y-axis. D. 4.0 cm, along -y-axis. E. 4.0 cm, 45° above +x-axis.
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 lens is coated with material of index of refraction 1.38. What thickness of coating should be used to give maximum transmission at a wavelength of 0.53 ?m?
What will be an ideal response?
The oceanic conveyor is often referred to as thermohaline circulation. Explain why this is an appropriate name
What will be an ideal response?