The attraction of a person's body toward Earth is called weight. The reaction to this force is
A) the person's body pushing against Earth's surface.
B) Earth's surface pushing against the person's body.
C) the person's body pulling on Earth.
D) none of the above
Answer: C
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What is the percentage increase in size when ordering a 14 inch rather than a 12 inch pizza?
A. 16% B. 26% C. 36% D. 46%
Germanium, Ge (number 32), computer chips operate faster than silicon, Si (number 14), computer chips. So how might a gallium, Ga (number 31), chip compare with a germanium chip?
A) A gallium chip would be even faster because the gallium is more metallic. B) A gallium chip would be slower because its electrons are more loosely held. C) Gallium is located just below aluminum, which is widely known to be an electrical insulator. D) Gallium is more nonmetallic and so it does not conduct electrons very well.
Water and ethanol can be separated by heating the ethanol until it boils away from the water. What type of change is this?
A) a physical change B) a chemical change C) a molecular change D) a decomposition E) none of the above
Water has an index of refraction of 1.333 . What is the speed of light through it? (c = 3.00 × 10^8 m/s)
a. 4.00 × 10^8 m/s b. 2.25 × 10^8 m/s c. 4.46 × 10^8 m/s d. 1.46 × 10^8 m/s