Energy in Nuclear Reactions: If a ?- particle at rest decays into a neutron and a ?-, what is the total kinetic energy of the decay products? The masses of ?-, neutron, and ?- are 1197 MeV/c2, 940 MeV/c2, and 140 MeV/c2, respectively.
Fill in the blank(s) with the appropriate word(s).
117 MeV
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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
How are galaxies spread throughout the universe?
A) Galaxies are densest near the Milky Way Galaxy and become less and less numerous the farther we look out into the universe. B) Galaxies are grouped in clusters that are spread more or less evenly throughout the universe. C) Galaxies are spread more or less evenly throughout the universe. D) Clusters of galaxies exist that are themselves often clustered into superclusters. Clusters and superclusters appear to be distributed on surfaces surrounding empty regions of space.
Earth's axis is tilted 23.5 degrees from a perpendicular to the plane of the ecliptic
Indicate whether the statement is true or false.
What are the satellites of the outer planets thought to be composed of?
A. water and carbon dioxide B. ice and rock C. hydrogen and methane D. hydrogen and helium