A 1500 RPM, 8 hp motor is to be used to lift a load. The screw has an outside diameter of 2 inches, a coefficient of friction of 0.1, a frictionless collar, and standard acme threads. a) If the screw has a standard pitch, what is the speed of the lift?

b) How much load can the lift raise?

c) Does the screw need a brake when at rest?

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