In an electroplating process, it is desired to deposit 40 mg of silver on a metal part by using a current of 2.0 A
How long must the current be allowed to run to deposit this much silver? The silver ions are singly charged, and the atomic mass of silver is 108 g/mol. (e = 1.60 × 10-19 C, NA = 6.02 × 1023 atoms/mol) A) 16 s
B) 18 s
C) 20 s
D) 22 s
B
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A 1 kg mass is suspended on the end of a string and it is swinging back and forth. If the string is plucked, the speed of the pulse
1.is fastest when the mass is at its highest point in the swing. 2.is fastest when the mass is at its lowest point in the swing. 3.is fastest when the mass is in the middle of its way down from the highest to the lowest point in its swing. 4.has the same speed at all points of the swing; the pulse's speed is not a function of the position of the mass as it swings.
Which gases within our atmosphere act as greenhouse gases?
a. water b. carbon dioxide c. oxygen and nitrogen d. all of the above e. a and b
A 150 W light bulb is operating on a 120 V rms ac line. What is the rms current in the bulb?
A. 2.50 A B. 1.67 A C. 1.50 A D. 1.25 A E. 0.883 A
Two blocks, joined by a string, have masses of 6.0 and 9.0 kg. They rest on a frictionless, horizontal surface. A second string, attached only to the 6.0-kg block, has horizontal force = 45 N applied to it. Both blocks accelerate. Find the tension in the string between the blocks
a. 18 N c. 12 N b. 27 N d. 9.0 N