A wave is described by y = 10 sin (4.0pt – 6.0px). If the equation is in SI units with the units suppressed, what is its speed?
a. 2/3 m/s
c. 1/6 m/s
b. 3/2 m/s
d. 1/4 m/s
A
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Why does ice float on water?
a. Ice is hydrophobic and repels water. b. Water molecules have less mass the colder they get. c. Water molecules are spaced farther apart in ice than in liquid water. d. Vibrating electrons in liquid water push ice to the surface. e. Hydrogen bonds are weaker in ice.
An object of weight W is in free-fall close to the surface of Earth. What is the force that the object exerts on Earth?
A) a force greater than W B) a force less than W C) a force equal to W D) no force at all E) cannot be determined without additional information
X-rays are scattered by _________on the atoms in the sample.
Fill in the blank(s) with the appropriate word(s).
Rank these planets in order of the strength of the greenhouse effect on the planet, from the least to the greatest
A) Mars, Mercury, Earth, Venus B) Mars, Earth, Venus, Mercury C) Mercury, Venus, Earth, Mars D) Mercury, Earth, Mars, Venus E) Mercury, Mars, Earth, Venus