A long, fine wire is wound into a coil with inductance 5 mH. The coil is connected across the terminals of a battery, and the current is measured a few seconds after the connection is made. The wire is unwound and wound again into a different coil with L = 10 mH. This second coil is connected across the same battery, and the current is measured in the same way. Compared with the current in the
first coil, the current in the second coil is:
1.four times as large.
2.twice as large.
3.unchanged.
4.half as large.
5.one-fourth as large.
3
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The escape velocity at the event horizon around a black hole is
a. smaller than the speed of light. b. equal to the speed of light. c. much larger than the speed of light. d. irrelevant since nothing (including light) can escape from a black hole.
the shortest time interval between these events?
A. Jennifer B. Rob C. The train passengers
How many more stars does a starburst galaxy form, in one year, than the Milky Way?
A) a few B) about ten C) about a hundred D) about a thousand E) about the same, but it does so for much longer
A container of ideal gas at STP undergoes an isothermal expansion and its entropy changes by 3.66 J/°K. How much work does it do?
What will be an ideal response?