When a carbon atom forms four single bonds, the bonds are at what angle to one another?
a. 109.5°
b. 90°
c. 120°
d. 23.5°
e. 60°
a
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The clouds of Venus are much higher in its atmosphere than are those in our troposphere
Indicate whether the statement is true or false
The intensity of cosmic rays bombarding the Earth's surface is most at the
A) poles. B) mid-latitudes. C) equator.
Velma, who is moving past you at a high rate of speed, holds a meter stick and a standard kilogram
Is it possible that your measurements could show the standard kilogram to have a mass of 2 kg while the meter stick still has its normal length of 1 m? A) Yes, if Velma holds the meter stick parallel to its direction of motion. B) Yes, if Velma holds the meter stick perpendicular to its direction of motion. C) No, because mass actually decreases with velocity, rather than increasing. D) No; if the kilogram's mass has increased to 2 kg, then it must be longer than 1 m. E) No; if the kilogram's mass has increased to 2 kg, then it must be shorter than 1 m.
When a wool blanket is used to keep warm, what is the primary insulating material?
a. wool b. air c. the trim around the edge of the blanket d. a thin layer of aluminum foil (usually not apparent) inside the blanket