Consider the signal ( )cos(2 )xttπ=Since 푥푥(푡푡) is periodic with a fundamental period of 1, it is also periodic with a period of 푁푁 where 푁푁 is any positive integer. What are the Fourier series coefficients of 푥푥(푡푡) if we were to regard it as a periodic signal with period 3? Explain the differences or similarities of the results. Plot the FS coefficients as a function of 푘푘 and as a function of 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.

Determine the stoichiometric and actual air-fuel ratios and the mole flue gas composition for combustion with 15% excess air for raw indiana, pennsylvania raw coal.

List and describe the attached tools in boxford cnc milling machine? and how many tools were used in your projects explain them?