Consider a ct lti system with frequency response h(j! ) = sin 4! ! (a) if the input to this system is a periodic signal x(t) = 8< : 1 0 t < 4 4 t < 8 (4) with period t = 8, determine the corresponding system output. (b) when the impulse train x(n) = p1 k= (n 4k) is the input to an lti system with frequency response h( the output of the system is found to be y(n) = cos( 5 2 n + 4 ). determine the value of h(ejk 2 ) for k = 0; 1; 2; 3.

Which of the following is an easy way to remember the modified “x” tire rotation? a. nondrive wheels straight, cross the drive wheels b. drive wheels straight, cross the nondrive wheels c. drive wheels crossed, nondrive wheels straight d. drive wheels crossed, nondrive wheels crossed

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?