Many terrestrial weather patterns have been observed and named, for example, the Southern Oscillation, the Arctic Oscillation/North Atlantic Oscillation, the Pacific Decadal Oscillation, and so on
How are these indices useful in the discussion of weather and climate?
These weather patterns must persist for long periods of time, and swing back and
forth. The interplay of the various oscillations has an effect on the position of the jet stream
(and so the weather).
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Copper has
current carrying electrons per
A copper wire of radius 0.15 mm carries a current of 17 mA. What is the average drift velocity for the electrons?
A. 
B. 
C. 
D. more information is needed for this calculation
A crate is given an initial speed of 3.0 m/s up the 25.0° plane shown in Fig. 5–33.
(a) How far up the plane will it go?
(b) How much time elapses before it returns to its starting point?
A negatively-charged rod is held near an aluminum can that rests on a dry wood table. If you momentarily touch the opposite side of the can with your finger, the can becomes
A) positively charged. B) negatively charged. C) partially discharged. D) completely discharged. E) none of the above
A certain utility transformer is designed to step up the emf from 1 kV to 25 kV. If the primary has 1000 turns of wire, how many turns of wire does the secondary have?
A. 25,000 B. 4000 C. 2500 D. 40 E. 25 F. Some other result (specify). T. One needs more information to answer.