A lens of focal length 10.0 cm is placed in contact with another lens, the combination having a focal length of 20.0 cm. The focal length of the second lens is
A)
200 cm.
B)
-20.0 cm.
C)
-10.0 cm.
D)
10.0 cm.
E)
20.0 cm.
B
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Fill in the blank(s) with the appropriate word(s).
The gas in a perfectly insulated but there is work done on the flexible container at a rate of - At what rate is the internal (thermal) energy of the gas changing?
A) -13 W B) 13 W C) 0 W D) 6.5 W
In air a concave mirror has a focal length of 30. cm. Under water that same mirror would have ________ focal length
A) a larger B) the same C) a smaller
Modern astronomers suspect the corona is heated by
a. shock waves rising from below the photosphere. b. the solar wind. c. magnetic carpets. d. shock waves rising from below the photosphere, the solar wind, and the solar magnetic field. e. none of the others.