A high-voltage transmission line carries 1 000 A at 700 kV for a distance of 100 miles. If the resistance per length in the wire is 0.5 W/mile, what is the power loss due to resistive losses?
50 MW
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An oil tanker heading due west, straight into a strong wind, reaches a speed of 5 m/s and then shuts down its engines to drift. The forward-facing flat surfaces of the tanker catch a total of 60,000 N of force from the wind. This wind force is pointing backwards, to the east. The tanker's mass is 100,000 metric tons, which is 100 million kg. If the wind blows at the same strength for 5 minutes, then how much has the wind changed the tanker's speed?
A. 0.18 m/s B. 0.018 m/s C. 1.2 m/s D. 1.08 m/s
If the Sun rises precisely due east,
A. you must be located at Earth's equator. B. it must be the day of either the March or the September equinox. C. it must be the day of the June solstice.
A beam of red light and a beam of violet light each deliver the same power on a surface. For which beam is the number of photons hitting the surface per second the greatest?
A) the red beam B) the violet beam C) It is the same for both beams.
Classify the following statement as a characteristic
(a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces. The force exerted on a negatively charged object is opposite in direction to the force on a positive charge.
1.electric forces 2.magnetic forces 3.both electric and magnetic forces 4.neither electric nor magnetic forces