A proton, moving east, enters a magnetic field. Because of this magnetic field the proton curves downward. We may conclude that the magnetic field must have a component
A) towards the south.
B) towards the north.
C) towards the west.
D) upward.
E) downward.
A
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Indicate whether the statement is true or false
The dedicated third wire on a 3-prong plug is connected to
A) ground. B) a fuse. C) a ground fault interrupter. D) the "hot" wire.
An ancient building was known to have been built 3 000 years ago. Approximately what proportion of Carbon-14 atoms are yet in the building's wooden framing compared to the number which were present at the time of its construction? (half life of 14C = 5 730 years)
a. 0.425 b. 0.500 c. 0.517 d. 0.696
The observation that materials expand in size with an increase in temperature can be applied to what proportion of existing substances?
a. 100% c. few b. most d. none