A 10 kg ball weighs 98 N in air and weighs 75 N when submerged in water. The buoyant force of the water on the ball is
A. 32 N.
B. 30 N.
C. 24 N.
D. 23 N.
E. 19 N.
D. 23 N.
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Characteristic x-rays are the result of
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A) 1.1 A B) 2.2 A C) 3.3 A D) 4.4 A E) 0.91 A
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.