A designer, wanting to achieve a stable gain of 100 V/V at 5MHz, considers her choice of amplifier topologies. ) What unity-gain frequency would a single operational amplifier require to satisfy her need? Unfortunately, the best available amplifier has an fi of 40MHz. How many such amplifiers connected in a cascade of identical noninverting stages would she need to achieve her goal? b) c) What is the 3dB frequency of each stage she can use? d) What is the overall 3dB frequency?

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.