Which best describes the property of surface tension in the examples pictured here?
a. Neighboring molecules of the liquid bond to each other, forming a flexible atomic sheet at the surface.
b. Molecules at the surface have different properties than atoms surrounded on all sides by other atoms.
c. At a surface, the interaction between air molecules and the fluid create the surface tension.
d. The surface tension pulls molecules out from the center of a liquid to the surface.
e. The surface tension only occurs at high temperatures.
a
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Suppose the date is June 21 and the Sun never rises, just touching your southern horizon at midnight. Where are you?
A) the equator B) the Tropic of Cancer (latitude 23-1/2°N) C) the Tropic of Capricorn (latitude 23-1/2°S) D) the Arctic Circle (latitude 66-1/2°N) E) the Antarctic Circle (latitude 66-1/2°S)
Which of the following appears most favored by natural selection?
A) intelligence B) opposable thumbs C) bipedal locomotion D) binocular vision E) live birth
Three different-mass projectiles are launched from the top of a building each at different angles of elevation. Each particle has the same initial kinetic energy. Which particle has the greatest kinetic energy just as it impacts with the ground?
a. The one launched at the highest angle of elevation. b. The one with the highest mass. c. The one with the lowest mass. d. They all will have the same kinetic energy on impact.
Calculate the Earth's angular momentum in the approximation that treats the Earth's orbit around the Sun as a circle. (MSun = 1.99 × 10^30 kg; T = 3.156 × 10^7 s; ME = 5.98 × 10^24 kg.)