A tube of mercury with resistivity 9.84 × 10-7 ? ? m has a uniform electric field of 23 N/C inside the mercury. How much current is flowing in the tube, if the radius of the tube is 0.495 mm?
A) 18 A B) 29 A C) 180 A D) 280 A
A
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When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, the speed of the skateboard
A) decreases. B) increases. C) neither decreases nor increases.
In the general theory of relativity, we assume the observer to be
A) moving at a significant fraction of lightspeed. B) moving with constant velocity. C) moving slowly compared to lightspeed. D) at rest. E) None of the above.
The gauge pressure of the water in a swimming pool at 10 ft is ____________ the gauge pressure of the water at 5 ft
a. 1/4 b. 1/2 c. equal to d. 2 times e. 4 times
Two blocks with mass m2 > m1 are pulled as shown along horizontal surfaces, each at a constant speed v. Which tension force does more work moving the block a distance D along the surface?