A battery operating a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 4 ohms. The voltage of the battery is __________
Fill in the blank(s) with correct word
8 volts
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According to Newton, the greater the distance between gravitationally interacting objects, the
A) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them.
How is L determined if it is greater than 0.6 m?
What will be an ideal response?
Observing star clusters will give astronomers needed data for stellar evolution because all the stars in the cluster have the same ____
a. masses b. temperatures c. ages d. luminosities e. apparent magnitudes
How does the energy of the cosmic microwave background compare to the energy radiated by all the stars and galaxies that ever existed?
A) They are very close to being equal. B) 73% cosmic background, 27% starlight. C) About ten times more from the Big Bang than from stars and galaxies. D) The starlight now dominates the background, as your eyes show clearly. E) We have no way of comparing matter and energy this way.