Conduction: The thermal conductivity of aluminum is twice that of brass. Two rods (one aluminum and the other brass) of the same length and cross-sectional area are joined together end to end. The free end of the brass rod is maintained at 0°C and the free end of the aluminum rod is maintained at 200°C. If no heat escapes from the sides of the rods, what is the temperature at the place where the two rods are joined together?
A. 76°C
B. 133°C
C. 148°C
D. 155°C
Answer: B
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There is a dislocation with a Burger’s vector between the origin of an FCC copper (Cu) crystal at 0,0,0 and the nearest lattice point in the (001) plane. The Cu lattice parameter is 0.362 nm.
(a) What is the Burger’s vector of this dislocation, in vector notation? (b) What is the magnitude of the Burger’s vector?
If you hold a shiny spherical Christmas tree ornament at arm's length and look at your reflection, the image is
A. upright and enlarged.
B. upright and reduced.
C. inverted and enlarged.
D. inverted and reduced.
If R = 3.0 k?, C = 6.0 nF, ? 1 = 10.0 V, Q = 18 nC, ? 2 = 6.0 V, and I = 5.0 mA, what is the potential difference Vb ? Va?
a.
?13 V
b.
+28 V
c.
+13 V
d.
?28 V
e.
+2.0 V
A 120 N picture hangs from a nail in the wall. The maximum shear stress the nail can sustain is 1.00 
The smallest diameter the nail can be is
A. 10.5 mm. B. 12.4 mm. C. 13.7 mm. D. 14.4 mm. E. 15.9 mm.