The wavelength of a certain laser is 0.35 micrometers, where 1 micrometer = 1 x 10-6 m. Express this wavelength in nanometers
A) 3.5 × 102 nm
B) 3.5 × 103 nm
C) 3.5 × 101 nm
D) 3.5 × 104 nm
A
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At the end of December, all of the Southern Hemisphere is in
A) darkness. B) light. C) summer. D) winter.
In what three ways does flowing water erode a stream channel?
What will be an ideal response?
Neutrons were discovered by James Chadwick by observing the behavior of
A. the collision after-effects of protons emerging from paraffin. B. carbon dioxide molecules under high pressure. C. copper conducting electricity in the absence of a magnetic field. D. gold atoms in a thin foil.
A solid lead cylinder 0.6-m in diameter and 0.6-m long, initially at a uniform temperature of 121°C, is dropped into a 21°C liquid bath in which the heat transfer coefficient h cis 1135 W/(m2 K). Plot the temperature-time history of the center of this cylinder and compare it with the time histories of a 0.6 m-diameter, infinitely long lead cylinder and a lead slab 0.6 m-thick.
GIVEN
• A solid lead cylinder dropped into a liquid bath
• Cylinder diameter (D) = 0.6 m
• Cylinder (L) = 0.6 m
• Initial uniform temperature (To) = 121°C
• Liquid bath temperature (T?) = 21°C
• Heat transfer coefficient h c= 1135 W/(m2 K)
FIND
(a) Plot the temperature-time history of the cylinder center (b) Compare it with the time history of a 0.6 m diameter, infinitely long lead cylinder (c) Compare it with the time history of a lead slab 0.6 m thick
ASSUMPTIONS
• Two dimensional conduction within the cylinder
• Constant and uniform properties
• Constant liquid bath temperature
SKETCH
