A 20-mF capacitor is attached across a 1000-V power supply. What is the net charge on the capacitor?
a. 20 mC
c. 10 mC
b. 40 mC
d. none of these choices
D
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A seismograph
A) predicts earthquakes. B) measures ground movement. C) helps prevent earthquakes. D) measures fault displacement.
A. The divergence is positive. B. The divergence is negative. C. The divergence is zero.
What is the magnitude of the acceleration of an electron when in an electric field of 
A. 
B. 
C. 
D. 
E. 
A plastic ball in a liquid is acted upon by its weight and by a buoyant force. The weight of the ball is NaN N. The buoyant force has a magnitude of NaN N and acts vertically upward
An external force acting on the ball maintains it in a state of rest. The external force, including direction, is closest to: A) NaN N, downward B) NaN N, upward C) NaN N, upward D) NaN N, upward E) NaN N, downward