A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.If two slide projectors are connected in parallel across the same 120-volt source, the current drawn from the source in amperes is
a. 3.
b. 6.
c. 9.
d. 12.
e. none of the above.
d
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At 10 cents per kilowatt-hour, how much does it cost to run a 100 watt lightbulb for 200 hours every month?
A) 20 cents per month B) $20 per month C) $2 per month D) impossible to determine because we don't know the voltage E) impossible to determine because we don't know the power
________ are hot compact remnant stars whose mass is typically between one and several times that of the Sun, but their size is only 10 km or less.
A. Neutron stars B. White dwarfs C. Pulsars D. Black dwarfs
Which of the following statements is true of Uranus when compared with Jupiter or Saturn?
A) Like Jupiter and Saturn, it radiates about the same amount of energy that it receives from the Sun. B) It has much less heat flowing out of its interior than Jupiter or Saturn. C) The composition of liquid metallic hydrogen in Uranus is similar to that of Jupiter and Saturn. D) Like Jupiter and Saturn, it rotates on its side, with its equator inclined about 25 degrees to its orbit.
Which of the following can contribute to explaining why jovian moons are sometimes much more geologically active than terrestrial worlds of similar (or smaller) size?
a. ice-rich composition b. tidal heating c. orbiting far from the Sun d. orbiting far from their planet e. having a core of metal and rock