A thin-walled tube having internal and external diameters of 0.25 m and 0.26 m is subject to an internal pressure of pi=2.8 MPa, a twisting moment of 31.36 kN. m, and an axial end thrust (tension) P=45 kN. The ultimate strengths in tension and in compression are 210 MPa and 500 MPa, respectively. Determine if failure has occurred using the following theories of failure. a) Maximum-shear-stress theory b) Coulomb-Mohr theory c) Maximum-principal-stress theory d) Tresca Theory

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

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?