In a capacitor in an AC circuit, the voltage:
a. leads the current by 90°.
b. lags the current by 90°.
c. may lead or lag the current depending on the frequency.
d. is in phase with 70.7% of the current.
b
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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.
Angular and Linear Quantities: A bicycle wheel has an outside diameter of 66 cm. Through what distance does a point on the rim move as the wheel rotates through an angle of 70°?
Fill in the blank(s) with the appropriate word(s).
The linear relationship between stress and elastic strain is known as _____________law
Fill in the blank(s) with the appropriate word(s).
Molecular Speeds: What is the average translational kinetic energy of an ideal gas at 819 K? The Boltzmann constant is 1.38 × 10-23 J/K.
A. 1.70 × 10-20 J B. 5.65 × 10-21 J C. 1.13 × 10-17 J D. 3.77 × 10-19 J