Earth's magnetic field is generated in the iron rich mantle
Indicate whether the statement is true or false
F
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Velocity Addition: Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from him in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Gamma moving?
A. 0.70c B. 1.4c C. 0.82c D. 0.94c E. 0.98c
What do we mean by a mass extinction?
A) the extinction of a large fraction of the world's plant and animal species in a relatively short period of time B) the extinction of large animals, such as dinosaurs C) an extinction caused by the impact of an asteroid or comet D) the extinction of any species of plant or animal that has mass
A space station out beyond the solar system is rotating with constant angular velocity. A spaceship heading into the station along a diameter of the station, uses its rockets to brake, and then docks inside the station at its center. When the spaceship docks, the angular momentum of the system consisting of the station and ship
a. is less than the original angular momentum of the station. b. is the same as the original angular momentum of the station. c. is greater than the original angular momentum of the station. d. is less than the original angular momentum of the station, but the angular velocity increases. e. is greater than the original angular momentum of the station, but the angular velocity decreases.
Clouds inhibit the outflow of terrestrial radiation. This acts to
A) insulate Earth's surface temperature. B) warm Earth's surface temperature at night. C) cool Earth's surface temperature during the day. D) insulate Earth's surface temperature, keeping it warmer at night and cooler in the day.