2 points A car is travelling down the road at 27.0 m/s on a cold winter morning (where the speed of sound is around 333 m/s) when it passes a stationary train whistle with a frequency
of 760 Hz. What is the frequency of the whistle heard by the driver of the car as the car drives away?
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Asquare isothermal chip is of width w=5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated; the front surface is exposed to the flow of a coolant at tinf=15 °c. from reliability considerations, the chip temperature must not exceed t=85 °c. if the coolant is air and the corresponding convection coefficient is h=200 w/m2 x k, what is the maximum allowable "power" of the chip? if the coolant is a liquid for which h=3000 w/m2 x k, what is the maximum allowable power of the chip?