Meen 222- Quiz 9

# Meen 222- Quiz 9 - If the rod in part(a is cooled from to...

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Peter Joseph William Debye (March 24, 1884 – November 2, 1966) was a Dutch physicist and physical chemist, and Nobel laureate. His first major scientific contribution was the application of the concept of dipole moment to the charge distribution in asymmetric molecules in 1912, developing equations relating dipole moments to temperature and dielectric constant. In consequence, the units of molecular dipole moments are termed debyes in his honor. Also in 1912, he extended Albert Einstein's theory of specific heat to lower temperatures by including contributions from low-frequency phonons. See Debye model MEEN 222 – 503 Fall 2008 Quiz #9 Student: Print First and Last Name

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1. (a) If a rod of brass 0.35 m long is heated from 15 to 85 o C while its ends are maintained rigid, determine the type and magnitude of stress that develops. Assume that at the rod is stress free. (b)
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Unformatted text preview: If the rod in part (a) is cooled from to 15 to -15 o C what type and magnitude of stress. (Modulus of elasticity of brass is 97 GPa and coefficient of thermal expansions is 20.0x10-6 ( o C)-1 . 2. Estimate the energy required to raise the temperature of 5 kg of aluminum materials from 20 to 150 o C. Specific heat of aluminum is 900 J/kg-K. 3. Heat capacity is a property that is indicative of a material’s ability to absorb heat from the external surroundings; it represents the amount of energy required to produce a unit temperature rise. TRUE / FALSE 4. The heat capacity of solids increases/decreases (circle correct answer) with temperature up to the Debye temperature above which it decreases with temperature. TRUE / FALSE 1 point 1 point 1 point 1 point 1 point for unit 1 point 1 point 0.5 point for unit 1 point 0.5 point for unit 1 point...
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Meen 222- Quiz 9 - If the rod in part(a is cooled from to...

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