The turbines in hydroelectric plant are feed by water falling from a height of 100ft. assuming 95% efficiency for converting the potential energy to electrical energy and 10% loss of resulting power transmission. how many tons of power per hour are needed to keep a 100watt light bulb burning?

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