A point charge Q is placed on the x axis at x = ?2.0 m. A second point charge, ?Q, is placed at x = 1.0 m. If Q = 60 ?C, what is the magnitude of the electrostatic force on a 40-?C charge placed at the origin?
A. 16 N
B. 27 N
C. 32 N
D. 11 N
E. 3.0 N
Answer: B
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a. December 21, the winter solstice. b. March 21, the vernal equinox. c. September 21, the autumnal equinox. d. June 21, the summer solstice.
Components: If a vector has components Ax < 0, and Ay < 0, then the angle that this vector makes with the positive x-axis must be in the range
A. 0° to 90°. B. 90° to 180°. C. 180° to 270°. D. 270° to 360°. E. It cannot be determined without additional information.
A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75,
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What is the potential difference Vb ? Va shown in the circuit below
a.
?8.0 V
b.
+8.0 V
c.
?18 V
d.
+18 V
e.
?12 V