Household 120-V outlets are made to accept three-pronged plugs. One of the prongs attaches to the "live" wire at 120 V, and another attaches to the "neutral" wire that is connected to ground. What is the round third prong for?
a. It serves as a backup to the hot wire.
b. It lets the appliance run if the neutral wire breaks.
c. It connects the case of the appliance directly to ground for safety purposes.
d. Nothing electrical, it is for mechanical sturdiness.
c
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The lowest tone to resonate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pipe?
A) 1000 Hz B) 400 Hz C) 200 Hz D) 600 Hz E) 1400 Hz
Inferring cloud properties using carbon-monoxide: At the low temperatures of molecular clouds, carbon monoxide emits radio light more strongly than does molecular hydrogen
What assumptions must be made to then use observations of carbon monoxide to infer the properties of the cloud as a whole?
Why do strange particles have long lifetimes compared to other strongly interacting particles?
a. No one knows—this is why they are called "strange.". b. They only decay via the weak interaction. c. They are more massive. d. none of the above
Temperature increases with altitude in the
A) troposphere. B) thermosphere. C) mesosphere. D) all of these