The reason that a surface appears darker when wet has to do with
A) the darkness of liquids.
B) conversion of light to lower frequencies.
C) absorption of multiply-reflecting light inside the wet region.
Answer: C
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A photovoltaic cell receives energy input primarily by
A) conduction. B) convection. C) radiation. D) all of the above
If a star collapses to a tenth its size, gravitation at its surface increases by
A) ten. B) twenty. C) one hundred. D) one thousand. E) more than one thousand.
When the atmosphere is unsteady, producing blurred images, the seeing is said to be good
Indicate whether the statement is true or false
A future use of space stations may be to provide hospitals for severely burned persons. It is very painful for a badly burned person on Earth to lie in bed. In a space station, the effect of gravity can be reduced or eliminated
With what period of rotation would a doughnut-shaped hospital of 200. m radius have to rotate, if persons on the outer perimeter are to experience 1/10 the gravity effect of Earth? A) 91. min B) 1.5 min C) 8.7 min D) 4.6 min E) 0.011 min