A length of wire has a resistance R. The wire is then uniformly stretched to double its original length. What resistance results. Hint: When the wire is stretched, its volume remains constant
1. R/2
2. R
3. 2R
4. more than 2R
4
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Phase Angles: A 50.0-mH inductor is connected in series with a 2500-? resistor in an ac circuit. What is the phase angle at 3000 Hz?
A. 20.7° B. -20.7° C. -75.9° D. 75.9° E. 90.0°
An electron is fired through a pair of deflection plates, which produce a 2.00 cm long region with an electric field of 4000 N/C perpendicular to the electron's initial velocity. If the initial speed of the electron is 
what angle will its new velocity make with the direction of the original velocity?
A. 14
B. 8.0
C. 5.5
D. 4.6
D. 4.6
On December 21, the noonday Sun is overhead at what latitude?
a. 0° b. 23.5°N c. 23.5°S d. That of the Tropic of Cancer
What is the Roche limit and how does it apply to the ring systems of Jupiter and Saturn?
What will be an ideal response?