Three charged particles are positioned in the xy plane: a 50-nC charge at y = 6 m on the y axis, a ?80-nC charge at x = ?4 m on the x axis, and a 70-nc charge at y = ?6 m on the y axis. What is the electric potential (relative to a zero at infinity) at the point x = 8 m on the x axis?
a. +81 V
b. +48 V
c. +5.8 V
d. ?72 V
e. ?18 V
b
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Two strings are, respectively, 1.00 m and 2.00 m long. Which of the following wavelengths, in meters, could represent harmonics present on both strings?
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The wavelength of an electromagnetic wave is 600 nm. What is its frequency? (c = 3.0 × 108 m/s)
A) 200 × 1012 Hz B) 300 × 1012 Hz C) 400 × 1012 Hz D) 500 × 1012 Hz E) 600 × 1012 Hz
If the tilt of Earth's rotation axis was increased from 23.5° to 40°, what would we expect to change?
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