To save energy while you leave your warm house for a half hour on a cold day, turn the thermostat
A) down.
B) up.
C) to room temperature.
Answer: A
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Which of the following is true of carbonaceous chondrites?
A) They contain materials left over from the formation of the Solar System. B) They do not contain any volatile compounds. C) They are a class of iron meteorites. D) They are a class of stony-iron meteorites.
A charged particle is moving with speed v perpendicular to a uniform magnetic field
A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field. If the frequency of revolution of the first particle is f, the frequency of revolution of the second particle is A) f. B) 2f. C) 4f. D) f/2. E) f/4.
The air in your classroom has
A) mass. B) weight. C) energy. D) all of the above E) none of the above
The force exerted on a current-carrying wire located in an external magnetic field is directly proportional to which of the following?
a. field strength c. both A and B b. current strength d. None of the above are valid.