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.
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?
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
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.