A heat treat furnace sketched in Figure 2-59 has an inside surface temperature of 1200ºC and an outside surface temperature of 60ºC. If the walls are assumed to be homogeneous with thermal properties the same as asbestos, estimate the heat transfer from the walls, excluding the door.
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Two mechanical waves meet and coincide. One wave has a positive displacement from the equilibrium position, and the other wave has a negative displacement. What kind of interference occurs?
a. constructive b. destructive c. complete constructive d. none
A piano string of density 0.0050 kg/m is under a tension of 1350 N. Find the velocity with which a wave travels on the string.
A. 260 m/s B. 520 m/s C. 1040 m/s D. 2080 m/s E. 4160 m/s
Determine the energy stored in C2 when C1 = 15 ?F, C2 = 10 ?F, C3 = 20 ?F, and V0 = 18 V
a.
0.72 mJ
b.
0.32 mJ
c.
0.50 mJ
d.
0.18 mJ
e.
1.60 mJ
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
a.
bulb 1 glows more brightly.
b.
bulb 2 glows more brightly.
c.
both bulbs continue to glow with the same brightness.
d.
bulb 1 goes out.
e.
bulb 2 goes out.