A thin flashlight beam traveling in air strikes a glass plate at an angle of 52° with the plane of the surface of the plate. If the index of refraction of the glass is 1.4, what angle will the beam make with the normal in the glass?
A) 34°
B) 64°
C) 26°
D) 56°
E) 38°
C
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A composite material is made of 50 % uniaxial glass fibers and 50% epoxy resin. The epoxy matrix is cured at 150ºC and then cooled to 25ºC. The elastic modulus of the glass fibers is 76 GPa, and the thermal expansion coefficient is 5×10-6 °C-1 . The elastic modulus of the epoxy resin is 4 GPa, and the thermal expansion coefficient is 60×10-6 °C-1 .
(a) Calculate the thermal stresses, both the magnitude and sign, in the matrix and in the fibers after the cured composite is cooled to room temperature. Assume that each material is elastic. (b) Calculate the composite strain in cooling from 150°C to 25°C.
The science of changing the activation enthalpy of a process is called _____________.
Fill in the blank(s) with the appropriate word(s).
What is the difference between heat conduction in series and in parallel between two materials?
What will be an ideal response?
Compared to the interstellar medium, the gases in a planetary nebula will be richer in helium and carbon
Indicate whether the statement is true or false