A composite material has a matrix of epoxy with an elastic modulus of 5 GPa and a reinforcement of E-glass fibers with an elastic modulus of 72.4 GPa. Use a computer program to calculate the elastic modulus in both the axial and transverse directions as a function of volume fraction of fibers. Use increments of 0.1 volume fraction and terminate the calculations at a fiber volume fraction of 0.8.
What will be an ideal response?
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A conducting sphere contains positive charge distributed uniformly over its surface. Which statements about the potential due to this sphere are true? All potentials are measured relative to infinity. (There may be more than one correct choice.)
A) The potential is lowest, but not zero, at the center of the sphere. B) The potential at the center of the sphere is zero. C) The potential at the center of the sphere is the same as the potential at the surface. D) The potential at the surface is higher than the potential at the center. E) The potential at the center is the same as the potential at infinity.
What is the troposphere?
A. the layer of the atmosphere where the weather we experience is located B. the layer of the atmosphere containing the ozone layer C. the uppermost layer of the atmosphere D. the layer of the atmosphere containing the aurora E. None of these choices are correct.
What are the measured densities of the exoplanets called "hot Jupiters," and why are these densities inconsistent with theoretical models?
What will be an ideal response?
A car traveling at a steady 20 m/s rounds an 80-m radius horizontal unbanked curve with the tires on the verge of slipping
What is the maximum speed with which this car can round a second unbanked curve of radius 320 m if the coefficient of static friction between the car's tires and the road surface is the same in both cases? A) 160 m/s B) 80 m/s C) 70 m/s D) 40 m/s E) 30 m/s