Aunidirectional glass fiber composite has a fiber volume fraction of 60%. the fibers have an elastic modulus 70 gpa and the matrix has an elastic modulus of 2 gpa. the fibers and matrix have poisson’s ratios of 0.2 and 0.34 respectively. the fibers and matrix have shear moduli of 30 gpa and 1.5 gpa respectively. determine the two shear moduli of the composite in the principle directions. assume ξ = 1

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?