A uniform thin wire has a length 
and is bent into a semicircular arc of radius R. If the wire starts at (x, y) = (R, 0) and curves counterclockwise to (x, y) = (?R, 0), what is the y coordinate of its center of mass?
What will be an ideal response?
0.637 R
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An observer at Earth's geographic north pole would find _______
a. the celestial equator passing at 45 degrees above the northern horizon. b. the celestial equator passing at 45 degrees above the southern horizon. c. that the celestial equator coincides with the horizon. d. the celestial equator passing directly overhead. e. None of the other choices are true.
When the speed of a wave depends on the wavelength (or frequency), the waves are said to exhibit diffraction
Indicate whether the statement is true or false
A charge of +3.0 ?C is distributed uniformly along the circumference of a circle with a radius of 20 cm. How much external energy is required to bring a charge of 25?C from infinity to the center of the circle?
a. 5.4 J b. 3.4 J c. 4.3 J d. 2.7 J e. 6.8 J
For a periodic process, the number of cycles per unit time is called the
A) amplitude. B) wavelength. C) frequency. D) period. E) pulse.