Write a matlab function [x]=dft(x, n) that calculates the dft of a length-n sequence x[n]. you should save your matlab script in a file called dft. m. if x[n] = [1, 2, 3, 4, 5], use the dft(x, n) function to find x[k], for 0 ≤ n ≤ 4. use the scheme you come up in prob. 9.6, write a simple matlab script to recover x[n] from x[k] using dft(x, n)

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

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero