The ____ coincides with the period known as the "little ice age" of Europe and North America. This provides one piece of evidence that suggests a link between solar activity and the amount of solar energy Earth receives

a. Maunder sunspot minimum
b. Babcock sunspot model
c. coronal hole
d. Coulomb barrier
e. weak solar force


A

Physics & Space Science

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What do we mean when we say that a magnetic field has polarity?

A. A planetary magnetic field is aligned with the geographic poles of the planet. B. A planetary magnetic field is strongest at the poles of the planet. C. A magnetic field is able to flip its poles over a long period of time. D. A magnetic field has a north and south "poles" or directions. E. None of these choices are correct.

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In an isochoric process, the internal (thermal) energy of an ideal gas decreases by 50 J. How much heat is exchanged with the gas during this process?

A) 0.00 J B) 25 J C) 50 J D) -25 J E) -50 J

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An uncharged spherical conducting shell surrounds a charge ?q at the center of the shell. Then charge +3q is placed on the outside of the shell. When static equilibrium is reached, the charges on the inner and outer surfaces of the shell are, respectively,

A. +q, ?q. B. ?q, +q. C. +q, +2q. D. +2q, +q. E. +3q, 0.

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If you observe the night sky in the direction of the North Star, you will observe that

A) the other stars near the north star move along clockwise circles around the north star during the night. B) the north star moves westward across the sky during the night. C) the other stars near the north star move in straight lines from east to west during the night. D) the other stars near the north star move along counterclockwise circles around the north star during the night. E) the north star moves eastward across the sky during the night.

Physics & Space Science