The heat of fusion for lead at 327.0 
22.9 kJ/kg and the specific heat of lead is 0.130 kJ/kg
What is the energy needed to melt 100 grams of lead starting at 0
?
A. 3.56 kJ
B. 4.23 kJ
C. 6.54 kJ
D. 7.02 kJ
E. 7.76 kJ
C. 6.54 kJ
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To determine the structure of the interior of a star, astronomers must balance density, luminosity, and ____
a. mass b. temperature c. mass and temperature d. mass and opacity e. temperature and opacity
A shell-and-tube heat exchanger having one shell pass and four tube passes is shown schematically in the following sketch. The fluid in the tubes enters at 200°C and leaves at 100°C. The temperature of the fluid is 20°C entering the shell and is 90°C leaving the shell. The overall heat transfer coefficient based on the surface area of 12 m2 is 300 W/(m2 K). Calculate the heat transfer rate between the fluids.
GIVEN
• A shell-and-tube heat exchanger with one shell pass and four tube passes
• Temperature of fluid in tube
? Tt,in = 200°C
? Tt,out = 100°C
• Temperature of fluid in shell
? Ts,in = 20°C
? Ts,out = 90°C
• Overall heat transfer coefficient (U) = 300 W/(m2 K)
• Surface area (A) = 12 m2
FIND
• The heat transfer rate (q)
ASSUMPTIONS
• Steady state
• Exchanger geometry is countnerflow
SKETCH
Thin Films: The wavelength of light in a thin film is 360 nm and the wavelength of light in vacuum is 469 nm. What is the index of refraction for the film?
A. 1.10 B. 1.30 C. 1.50 D. 1.70 E. 1.90
The person who first explained the blackbody spectrum was
a. Max Planck. b. Albert Einstein. c. Neils Bohr. d. Erwin Schrödinger. e. Werner Heisenberg.