Suppose that taking the 256-point dft of fx[0]; x[1]; x[2]; : : : x[255]g yields a set 256 dft coeffcients that are mostly zero; in particular, suppose that there are only three nonzero dft coeffcients: x[0] = 512, x[8] =-64j and x[248] = 64j. find an equation for the n-th time-domain value x[n] that is valid for n = 0; : : : ; 255.

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false

Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.

Aplate of dimensions 3 m x 3 m is placed 0.37 mm apart from a fixed plate. the plate requires a force of 2n to move at speed of 45 cm/s. evaluate the viscosity of the fluid in between the plates