The Earth's magnetic field is generated in
A) outer space.
B) the crust.
C) the mantle.
D) the outer core.
Answer: D
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What will be an ideal response?
Velocity Addition: Two spaceships are traveling through space at speeds of 0.600c and 0.900c, respectively, with respect to Earth. If they are headed directly toward each other, what is their approach speed (in terms of the speed of light) as measured by the captain of either ship?
Fill in the blank(s) with the appropriate word(s).
Waves on a String: A rope with a total mass of 25.0 kg is tied to a tree on one side of a 125-m wide ravine. You are pulling on the other end of the rope with a force of 415 N. If you pluck the rope at your end, how long will it take the pulse to travel across the ravine to the tree?
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The wavelength from an FM station broadcasting at 93.9 megahertz on your radio is
a. 31.3 m. b. 3.13 m. c. 0.313 m. d. 0.0313 m. e. none of the above.