How many electrons can be found with principal quantum number in a suitably heavy atom?
A) 18
B) 6
C) 20
D) 9
A
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Air at 0ºC blows across a 3 cm diamter power cable at 20 m/s. If the outside surface of the cable is 50ºC, estimate (a) the heat transfer per unit length and (b) the Drag force in Newtons per meter length of cable.
What will be an ideal response?
The efficiency of a heat engine
a. can never exceed the Carnot efficiency. b. can be improved by lowering the temperature of the cool reservoir. c. can be improved by raising the temperature of the hot reservoir. d. all of the above
In science, conceptual representations of observed phenomena are referred to as
A) facts B) hypotheses C) models D) beliefs
If ? 1 = 4.0 V, ? 2 = 12.0 V, R1 = 4 ?, R2 = 12 ?, C = 3 ?F, Q = 18 ?C, and I = 2.5 A, what is the potential difference Va ? Vb?
a.
?30 V
b.
30 V
c.
5.0 V
d.
?5.0 V
e.
?1.0 V