An AC generator with peak voltage 100 volts is placed across a 10-? resistor. What is the average power dissipated?
a. 100 W
b. 150 W
c. 500 W
d. 1000 W
e. 2000 W
c
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The wavelength of a wave describes ________.
A. the distance a wave will travel after being emitted B. the distance from one end of a laser beam to the other C. the distance between a peak and the nearest trough D. the distance a wave can travel before being absorbed E. the distance between two successive peaks in a wave
An iron rod becomes magnetic when
A) opposite ions accumulate at each end. B) its atoms are aligned. C) the net spins of many internal electrons are aligned. D) its electrons stop moving and point in the same direction.
Which of the following is not one of the ways sound can be used?
a. to circulate the refrigerant in a refrigerator b. to relay information to orbiting satellites c. to form images of internal organs d. to measure the air temperature aloft e. to make a bubble in water produce light
A black hole is
A) a region of space that is collapsed in on itself. B) the result of the collapse of supergiant star. C) likely found at the center of each spiral galaxy. D) All of the above