Which two of the following places are nearest to each other? Place A at latitude 20°N, longitude 90°W Place B at latitude 30°N, longitude 90°W Place C at latitude 30°N, longitude 75°W Place D at latitude 20°N, longitude 75°W
Places B and C
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The currently accepted theory for the formation of the Moon is the
A) co-formation model in which the Moon formed from a rotating disk of gas and dust around the Earth B) fission model in which the Moon was spun out from a rapidly rotating Earth C) giant impact model in which material was blasted from the Earth after an impact with a body the size of the planet Mars D) capture model in which the Moon formed elsewhere and was later captured into orbit by the Earth's gravity
In quantum theory, what happens if an electron's wave packet is squeezed into a smaller region of space?
A) You decrease the electron's uncertainty in velocity and also decrease its uncertainty in position. B) You increase the electron's uncertainty in position while decreasing its uncertainty in velocity. C) You decrease the electron's uncertainty in position while increasing its uncertainty in velocity. D) You decrease the electrons uncertainty in velocity while leaving its uncertainty in position unaffected. E) You decrease the electrons uncertainty in position while leaving its uncertainty in velocity unaffected.
Sunspots tend to occur in groups, or pairs, with the magnetic field around the pair resembling that around a bar magnet
a. True b. False Indicate whether the statement is true or false
Do you remember how we do measure distances to stars?
A: inverse square law B: p-p chain C: parallax D: measure sizes E: none of the above