5. a 5 mhz ultrasonic transducer is used for measuring blood flow in a vessel of 6 mm internal diameter. if the average doppler frequency is 4000 hz and doppler angle is 60o, what is the average flow rate? assume the flow velocities are constant in the vessel and the sound speed in blood is 1540 m/sec.

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