F06-MT1-Review

# F06-MT1-Review - Fall 2006 7B Midterm#1 Review Session...

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Fall 2006 - 7B Midterm #1 Review Session Saturday Sep 30th, 2006 1) [Problem #3 in Dr. Packard’s Fall 2002 MidTerm-1 exam] A weighing scale measures the net downward force of an object placed on its top surface. A ball of lead is submerged in water at 10°C and rests on a weighing scale. If the water temperature increases to 30°C, what is the fractional change in weight ( Δ W/W) as shown on the scale? The linear expansion coefficient of lead is 2.9x10 -5 (°C) -1 and the volume expansion coefficient of water is 21x10 -5 (°C) -1 . 2) We have our circular coffee with area A pot at temperature T f. Assume the pot only looses heat due to the radiation emitted (also assume the emissivity of the pot is ε =1). To be able to keep our coffee at the desired temperature, we connect it to a heater using a composite rod, with cross sectional area A 1 =A 2 , lengths L 1 and L 2 and conductivity constants k 1 and k 2 . At what fixed temperature T ? is the heater set? T ? k

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F06-MT1-Review - Fall 2006 7B Midterm#1 Review Session...

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