Which star in Diagram 8-1 is most like the Sun?
D
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Consider the following statement, and explain whether or not it is sensible: The universe is between 10 and 16 billion light-years old
What will be an ideal response?
A 10-V-emf battery is connected in series with the following: a 2-µF capacitor, a 2.0-? resistor, an ammeter, and a switch, initially open; a voltmeter is connected in parallel across the capacitor. At the instant the switch is closed, what are the current and capacitor voltage readings, respectively?
a.
zero A, 10 V
b.
zero A, zero V
c.
5 A, zero V
d.
5 A, 10 V
Which of the following are the units of a henry and a farad, respectively?
a. J ? s2/C2 and C2/J b. V ? s/A and V/C c. V/(A ? s) and C/V d. N ? m/A2 and 1/J e. None of the above
Why do sunspots appear dark in pictures of the Sun?
A) They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere. B) They are too cold to emit any visible light. C) They are holes in the solar surface through which we can see through to deeper, darker layers of the Sun. D) They are extremely hot and emit all their radiation as X rays rather than visible light.