Use the stem() function to plot the following discrete-time signals (if complex, plot the amplitude and phase). determine if the signals are power signal or energy signal and find the corresponding power and energy. (when finding the energy of signal with infinite support, use a large enough n to approximate infinity). a) exp(-n) cos(0.2īn) u(n) b) exp(n) u(-n) c) exp(-j0.2min)

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.