The smallest kinetic energy that an electron in a box (an infinite well) can have is zero
A) True
B) False
B
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a uniaxial composite material is made into a circular rod with a 1.27 cm diameter from 70 vol % continuous carbon fibers and 30 vol % epoxy. The rod is subject to an axial force of 100,000 N. The composite material in Example Problem 12.1 is to be replaced with a less expensive composite made of 70 vol % continuous E-glass fibers and 30 vol % epoxy. The elastic moduli are 5 GPa for the epoxy resin and 72.4 GPa for the E-glass.
(a) Compare the elastic modulus, composite strain, fiber and matrix stresses, and density of this composite with the carbon epoxy composite in Example Problem 12.1. Use the density of UHM carbon, and assume the density of the epoxy is 1.2 g/cm3. (b) Can both the E-glass fiber and matrix withstand the applied force?
The organisms with the next highest Encephalization Quotient (EQ) ratios after humans are
A) dolphins B) humans C) whales D) chimps
What is the difference between re-radiating surfaces and black body surfaces?
What will be an ideal response?
When the Sun and Moon are lined up and pull together the tides they raise are called:
A. low tides B. prolate tides C. spring tides D. neap tides