What would happen if the battery connections were suddenly reversed?
Jewelry is often manufactured by electroplating an expensive metal such as gold over a cheaper metal. A setup for this process can be sketched as follows:
A) The ring would continue to electroplate with gold.
B) Gold ions in solution would get reduced and settle to the bottom of the container.
C) Gold ions in solution would begin to electroplate onto the gold electrode.
D) All electrolysis would stop.
Answer: C
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A skater can spin faster by pulling her arms closer to her body or spin slower by spreading her arms out from her body. This is due to
A) the law of gravity. B) Newton's third law. C) conservation of momentum. D) conservation of angular momentum. E) conservation of energy.
The Garfield Thomas water tunnel at Pennsylvania State University has a circular cross-section that constricts from a diameter of 3.6 m to the test section, which is 1.2 m in diameter. If the speed of flow is 2.0 m/s in the large-diameter pipe, determine the speed of flow in the test section
a. 9.0 m/s c. 27 m/s b. 18 m/s d. 1.0 m/s
A car starting from rest accelerates at a constant 2.0 m/s2 for 10 s. It then travels with constant speed it has achieved for another 10 s. Then it finally slows to a stop with constant acceleration of magnitude 2.0 m/s2
How far does it travel after starting? A) 200 m B) 400 m C) 500 m D) 300 m
American power plants usually supply 120 V ac
(a) At what frequency is this voltage supplied? (b) What is the maximum voltage? What will be an ideal response?