Two clean, glass plates spaced 0.2 mm apart are placed in 20°C water. How far up the plates will the water climb if the contact angle is 0°?
(A) 75 mm
(B) 70 mm
(C) 65 mm
(D) 60 mm
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Which of the following observations is not a piece of evidence that lends support to aspects of the Big Bang theory?
A) the darkness of the night sky B) the expansion of the universe C) the observed helium abundance in the universe D) the relative motions of galaxies in the Local Group
Which best describes the surface of Triton?
a. old, dark and cratered with a younger surface marked by ovoids b. dark, dirty ice heavily pocked with craters c. an icy crust free of craters with a liquid water ocean beneath it d. an icy surface dominated by frozen nitrogen, methane, carbon monoxide and carbon dioxide e. an icy surface dominated by frozen methane with a liquid ocean beneath it
When you stand at rest on a pair of bathroom scales, the readings on the scales will always
A) each be half your weight. B) each equal your weight. C) add to equal your weight. D) add up to more than your weight.