Transformers: A transformer is a device that normally
A. operates on either dc or ac.
B. operates only on ac.
C. operates only on dc.
Answer: B
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Which one of the phrases below is the current explanation of why the surface of Venus is so hot?
a. Venus's poor reflectivity b. the action of the greenhouse effect caused by carbon dioxide c. always keeping the same face turned toward the Sun d. the action of the greenhouse effect caused by hydrogen
Constellations are ________.
A. fixed patterns of stars on the celestial sphere B. stars representing the path of the Sun through the sky C. groups of stars that are close to each other in space D. animals that look like groupings of stars E. stars that neither rise nor set
A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm). What is the magnitude of the magnetic field in this region?
A. 18 mT B. 12 mT C. 15 mT D. 22 mT E. 10 mT
A bowling ball size probe from a spaceship and a pebble size object land on a large asteroid that is far from any star. After a long period of time has passed, it is highly probable that the pebble and the probe
a. have each had the same change in temperature. b. have each had the same change in volume. c. are in thermal equilibrium with one another. d. are not in thermal equilibrium with one another. e. are in thermal equilibrium with one another, but are not at the same temperature.