In a(n) ______ live chat, visitors initiate the chat.
A. proactive
B. agent
C. sidebar
D. broadcast
Answer: D
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Suppose that we connect two identical realistic batteries in parallel. The internal resistance of the combined set of batteries (considered as a unit) is
A. twice that of each individual battery. B. half that of each individual battery. C. the same as that of each individual battery.
A 30-?F capacitor is charged to 80 V and then connected across an initially uncharged capacitor of unknown capacitance C. If the final potential difference across the 30-?F capacitor is 20 V, determine C.
A. 60 ?F B. 75 ?F C. 45 ?F D. 90 ?F E. 24 ?F
Suppose the gravitational force of the Earth on a body was 
. What escape velocity ve would a body need to escape the gravitational field of the Earth?
A.
.B.
.C.
.D.
.E.
.What is the formula mass of ammonium phosphide, (NH4)3P?
a. 85.0 u b. 49.0 u c. 48.0 u d. 57.0 u