If you double the thickness of a wall built from a homogeneous material, the rate of heat loss for a given temperature difference across the thickness will
A) become one-half its original value.
B) double.
C) become one-fourth its original value.
D) quadruple.
E) become one-eighth its original value.
A
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Conduction: A heat-conducting rod, 0.90 m long and wrapped in insulation, is made of an aluminum section that is 0.20 m long and a copper section that is 0.70 m long. Both sections have a cross-sectional area of 0.00040 m2. The aluminum end and the copper end are maintained at temperatures of 30°C and 230°C, respectively. The thermal conductivities of aluminum and copper are 205 W/m ? K (aluminum) and 385 W/m ? K (copper). What is the temperature of the aluminum-copper junction in the rod with steady state heat flow?
A. 100°C B. 93°C C. 86°C D. 80°C E. 74°C
A temperature of 0 Kelvin means there is essentially no motion at the atomic level.
Answer the following statement true (T) or false (F)
Infall of ________ may explain the higher than expected star formation rates in galaxies
Fill in the blank(s) with correct word
How fast do plates move on Earth?
A) a few centimeters per year B) a few millimeters per century C) a few kilometers per century D) quite fast, but only during earthquakes E) about 1 mile per hour