Just above the surface of the Earth, the direction of the gravitational field is away from the Earth
a. True
b. False
Indicate whether the statement is true or false
False
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An unusual lightning strike has a vertical portion with a current of ?400 A downwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
a. 0. b. 0.012 N, East. c. 0.012 N, West. d. 0.30 N, West. e. 300 N, East.
Where does a tsunami usually occur?
A) transform—fault boundary B) underwater reverse fault C) divergent boundary D) continental—continental convergent boundary
You discover a new star that is 352,800 AU away. What is the distance in light years?
a. 5.6 ly b. 2.3 ly c. 63 ly d. 3.53 ly e. 2.22 x 10^2 ly
What do astronomers think is the eventual fate of a white dwarf?
What will be an ideal response?