Design a simple two gear train with velocity ratio -8: 1, and a diametral pitch of 12. specify the pitch diameters and the number of teeth, and calculate the contact ratio mp. assume a pressure angle of 20◦ . with all things remaining the same, will the contact ratio increase or decrease if you had a pressure angle of 25◦ . check your prediction by recalculating the length of action z and then

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