Two resistors of values 7.0 and 15.0 ? are connected in parallel. This combination in turn is hooked in series with a 3.8-? resistor and a 22.3-V battery. What is the current in the 3.8-? resistor?
a. 21 A
b. 2.6 A
c. 0.86 A
d. 5.9 A
e. 190 A
b
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LC Circuits: A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible. Initially, the switch is open, the capacitor voltage is 50 V, and the current in the inductor is zero. At time t = 0 s, the switch is closed. How long after closing the switch does the magnetic energy in the inductor first reach its maximum value?
A. 2.0 ms B. 4.0 ms C. 6.0 ms D. 8.0 ms E. 10 ms
A force of 10.0 N is applied to a wire with an un-stretched length of 4.00 m and a diameter of 5.00 mm. If the wire changed length by 1.20 mm, then the stress in the wire is
a. 
b. 
c. 
d. 
e. 
A chemical reaction generally has a great effect on an atom's
a. nuclear structure. b. mass. c. nuclear binding energy. d. electron configuration.
For a specific element, photons of how many different energies could be emitted by electrons in the n = 3 level as they return to the n = 1 level?
a. 1 b. 4 c. 2 d. 3