Electromagnetic waves are generated whenever the ____
a. motion of any particle is changed
b. motion of any charged particle changes
c. motion of a positively charged particle is changed
d. motion of a negatively charged particle is changed
e. acceleration of any charged particle is changed
b
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The most massive main-sequence stars are the ________ spectral class and the ________ luminosity class
Fill in the blank(s) with correct word
Q1 = 6.0 nC is at (0.30 m, 0); Q2 = -1.0 nC is at (0, 0.10 m); Q3 = 5.0 nC is at (0, 0). What is the magnitude and direction of the net force on the 5.0 nC charge?
What will be an ideal response?
A 1.00-kg ball has zero kinetic and potential energy. Ernie drops the ball into a 10.0-m-deep well. Just before the ball hits the bottom, the sum of its kinetic and potential energy is:
a. zero. b. 98.0 J. c. ?98.0 J. d. 196 J. e. ?196 J.
Modern electroplaters can cover a surface area of 55.0 m2 with one troy ounce of gold (volume = 1.611 cm3). What is the thickness of the electroplated gold?
a. 3.64 × 10^-7 m c. 1.83 × 10^-6 m b. 1.46 × 10^-9 m d. 2.93 × 10^-8 m