Resistance and Resistivity: The resistivity of the material of a wire is 1.76 × 10-8 ? ? m. If the diameter of the wire is 2.00 mm and its length is 2.00 m, what is its resistance?
A. 112 ?
B. 11.2 ?
C. 1.12 ?
D. 0.112 ?
E. 0.0112 ?
Answer: E
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A light bulb is rated at 30 W when operated at 120 V. How much charge enters (and leaves) the light bulb in 1.0 min?
a. 17 C b. 15 C c. 14 C d. 13 C e. 60 C
Match the words in the left-hand column to the appropriate blanks in the sentences in the right-hand column. Use each word only once.
Saturn, Earth, Mars, Venus, Uranus, Mercury, Jupiter, Neptune
1. ____________ has a rotational axis that is tilted so much it lies nearly in the plane of its orbit.
2. ____________ is the planet with the highest average surface temperature.
3. The planet that orbits closest to the Sun is __________.
4. The only rocky planet to have more than one moon is ___________.
5. ___________ is the jovian planet that orbits closest to the Sun.
6. Most of the surface of _________ is covered with liquid water.
7. ___________ is about 30 times as far from the Sun as our own planet.
8. The planet with the lowest average density is ___________.
A typical battery (e.g., D-cell or AA-cell) supplies electricity at an approximate cost of
A) $1./kW ? h. B) 10.¢/kW ? h. C) $10./kW ? h. D) 1.¢/kW ? h. E) $100./kW ? h.
Does the uncertainty principle affect our ability to follow the path of a baseball? Why or why not?
A) No, because the uncertainties in the position and momentum of the baseball are so small in comparison to its size and total momentum that they are unnoticeable. B) Yes, because we cannot know both where the baseball is and which way it is going at the same time. C) No, because the exclusion principle says that large objects are excluded from the consequences of the uncertainty principle. D) No, because the uncertainty principle applies only to electrons.