A tube of mercury with resistivity 9.84 × 10-7 ? ? m has an electric field inside the column of mercury of magnitude 23 N/C that is directed along the length of the tube. How much current is flowing through this tube if its diameter is 1.0 mm?
A) 18 A
B) 180 A
C) 29 A
D) 280 A
A
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An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
Equilibrium: A 10-kg sign is held by two ropes as shown in the figure. What is the tension on rope A?
A. 44 N B. 69 N C. 72 N D. 88 N E. 98 N
Why do Earth rocks have much younger ages than most meteorites?
A) Earth formed billions of years after most meteorites formed. B) The rocks solidified long after the formation of the solar nebula. C) The atoms that make up Earth rocks are generally younger than the atoms that make up meteorites. D) Most meteorites come from other planetary systems that formed before our solar system.
A 30-?F capacitor is charged to 40 V and then connected across an initially uncharged 20-?F capacitor. What is the final potential difference across the 30-?F capacitor?
a. 15 V b. 24 V c. 18 V d. 21 V e. 40 V