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A causal discrete-time LTI system is described by y [n] - fr [n - 1] + i y [n - 2] = x [n] where x [n] and y [n] are the input and output of the system, respectively.
(a) Determine the frequency response H(fl) of the system.
(b) Find the impulse response h[n] of the system.
(c) Find y [n] if x [n] = q)nu[n].
Determine the least area of a cross section of an ASTM-a36 steel bar required to support a tensile load of 100,000 lbs. the allowable unit stress is 36,000 psi. (Ans. nearest 100th of an inch squared)
A force of F= (-2i+8j-6k)N is applied to an object that is constrained to move in the direction u=0.5571i+0.4481j-0.6992k. If the object has a total displacement of 10 meters in the direction of u, calculate the work done on the object by the force.
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