A high-voltage transmission line carries 500 A at 700 kV for a distance of 100 miles. If the resistance in the wire is 1 W/mile, what is the power loss due to resistive losses?
a. 250 MW
c. 25 MW
b. 2.5 kW
d. 25 kW
C
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Resistance and Resistivity: How much current will flow through a 40.0-m length of metal wire with a radius of 4.0 mm if it is connected to a power source supplying 16.0 V? The resistivity of the metal is 1.68 × 10-8 ? ? m.
A. 1200 A B. 9.5 × 108 A C. 68 nA D. 710 A
If the magnification of a mirror is negative, which of the following is correct?
A) The image is upright and the mirror is convex. B) The image is inverted and the mirror is convex. C) The image is inverted and the mirror is concave. D) All of the previous answers can be correct. E) None of the previous answers is correct.
As minerals crystallize in cooling magma, are the minerals with lower amounts of silica or the minerals with higher amounts of silica the first to crystallize?
What will be an ideal response?
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