Sound energy that is not reflected is
A) transmitted.
B) absorbed.
C) either or both of these
Answer: 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 last quarter phase of the Moon:
A) rises at sunrise. B) sets at sunrise. C) crosses the meridian at sunrise. D) rises at sunset. E) sets at sunset.
Energy lost by an isolated pulsar is carried away by a _____________
Fill in the blank(s) with correct word
A charged particle is moving with speed v perpendicular to a uniform magnetic field. A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field. The frequency of revolution of the first particle is f
The frequency of revolution of the second particle is A) f. B) 4f. C) f/2. D) f/4. E) 2f.