Northern Hemisphere winters are colder than Northern Hemisphere summers because
a. Earth is closer to the sun during the summer than it is during the winter.
b. the snow that falls in the northern latitudes cools Earth during the winter.
c. the light from the sun shines more directly on the Northern Hemisphere during the summer.
d. the period of sunlight is longer during the summer than during the winter.
e. c and d
E
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The wire in Fig. 29-2 carries a current I that is decreasing with time at a constant rate. The induced emf in each of the loops is such that
A) no emf is induced in any loop. B) all loops experience counterclockwise emf. C) loop A has clockwise emf, loop B has no induced emf, and loop C has counterclockwise emf. D) loop A has counterclockwise emf, loop B has no induced emf, and loop C has clockwise emf. E) loop A has counterclockwise emf, loop B clockwise emf, and loop C has clockwise emf.
The helium core flash occurs in very high mass stars
a. True b. False Indicate whether the statement is true or false
Angela claims that she wears a cylindrical-shaped hollow gold bracelet because it expands less than a solid one with a change in temperature. Clarissa claims that a cylindrical-shaped solid gold bracelet expands less than a hollow one. Which one, if either, is correct?
a. Angela, because the bracelet expands outward on its outer surface and inward on its inner surface. b. Clarissa, because the bracelet expands outward on its outer surface and inward on its inner surface. c. Angela, because the inner circumference does not change, but the outer circumference expands. d. Clarissa, because the inner circumference does not change, but the outer circumference expands. e. Neither, because both the inner and outer circumferences increase in length.
The _________material in a composite is continuous and surrounds the reinforcing phase of particles or fibers.
Fill in the blank(s) with the appropriate word(s).