Abar of steel has the minimum properties se=276mpa, sy=413mpa, sut=551mpa. find the factor of safety guarding against a static failure, and either the factor of safety guarding against a fatigue. failure or the expected life of the part, if a steady torsional stress of 103 mpa, an alternating torsional stress of 69 mpa, and an alternating bending stress of 83 mpa are applied to the bar

1in2 processor chip can be modelled as an isothermal plane wall of silicon, isothermal on both sides. the power input to the bottom of the plane wall, or the processing power of the chip, often called the thermal design power (tdp), is 100w. assume the periphery is adiabatic. the silicon is 400 microns thick. the temperature at the junction, or in this case on the bottom of the isothermal plane wall, is 85°c. what is the top surface temperature, assuming that the only mode of heat transfer is conduction