Briefly describe how the solar wind affects magnetospheres and how aurora are produced
What will be an ideal response?
Some particles from the solar wind get trapped in the magnetosphere and can follow the magnetic field lines down to the planet's surface. Since the magnetic field lines are concentrated at the magnetic poles, most of these particles collide with atoms and molecules in the atmosphere, causing them to radiate and create beautiful, often colorful auroras near the poles.
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The following three appliances are connected to a 120-V house circuit: i) toaster, 1200 W, ii) coffee pot, 750 W, and iii) microwave, 1000 W. If all were operated at the same time, what total current would they draw?
a. 5.0 A c. 23 A b. 25 A d. 6.0 A
A satellite in an elliptical orbit travels at a
1) constant speed 2) variable speed 3) not enough information to say because 4) the net force acting on it is zero. 5) of the component of gravitational force existing in its direction of motion. 6) it is characteristic of it to do so. 7) again, not enough information is given to say.
When a hydrogen bomb explodes, hydrogen fuses to form helium. According to Einstein's mass-energy equivalence [that is, according to E=mc2], does this result in an change in the total mass of the material?
A) Yes, the mass increases, but by such a small amount that it would be impossible to measure it. B) Yes, the mass increases, and by a measurable amount. C) Yes, the mass decreases, and by a measurable amount. D) Yes, the mass decreases, but by such a small amount that it would be impossible to measure it. E) No, the mass remains exactly the same.
On a force vs. position graph, the area under the curve is a representation of
A) force. B) position. C) kinetic energy. D) potential energy. E) work.