A power line carries 1000 A at a height of 20 m above the ground. What is the resulting magnetic field at ground level?
A. 50 mT
B. 0.13 mT
C. 13 
T
D. 10 
T
E. 5.0T
D. 10 T
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Saturn is the largest and most massive of the Jovian planets
a. True b. False Indicate whether the statement is true or false
Energy and Mass: A person with an initial mass of 70 kg climbs a stairway and thereby rises 6.0 m in elevation. By how much does his mass increase by virtue of his increased potential energy? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
A light-emitting diode (LED) converts electricity to approximately sinusoidal electromagnetic waves with a definite frequency f. Imagine that light from the LED creates an oscillating electric field with amplitude E0 at a certain location. If we increase the electrical power to the LED so that the oscillation amplitude is now 2E0, by what factor have we increased the power?
A. 4 times
B. 2 times
C. 
times
D. One cannot answer without more information.
You find a mysterious rock on the ground and determine that 60% of its uranium-235 has been converted into lead-207. What is the most likely origin of the rock, based on its radiometric age?
A) It's older than our solar system, so it must have come from another solar system. B) It's a meteorite dating back to the formation of the solar system. C) It's a volcanic rock nearly a billion years old. D) It was just formed this year during the eruption of a nearby volcano.