A heat-conducting rod that is wrapped in insulation is constructed with a 0.15-m length of alloy A and a 0.40-m length of alloy B, joined end-to-end.
Both pieces have cross-sectional areas of 0.0020 m2. The thermal conductivity of alloy B is known to be 1.8 times as great as that for alloy A. The end of the rod in alloy A is maintained at a temperature of 10C, and the other end of the rod is maintained at an unknown temperature. When steady state flow has been established, the temperature at the junction of the alloys is measured to be 40 C, and the rate of heat flow in the rod is measured at 56 W. What is the thermal conductivity of alloy A?
A) 120 W/m K
B) 125 W/m K
C) 130 W/m K
D) 135 W/m K
E) 140 W/m K
Question 2
What would be the de Broglie wavelength for 1-g object moving at the earth's escape speed 25,000 mph (about 11 km/s)? (h = 6.626 10-34 J s)
What will be an ideal response?
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Cover heat source to slow cooling by placing a towel over it.
The Heat Index.