Questions asked
Write down an (in)equality which describes the solid ball of radius 3 centered at (5, -2, 4). It should have a form like $x^2 + y^2 + (z - 2)^2 - 4 >= 0$, where you use one of the following symbols <, <=, =, >=, > The first blank is for the algebraic expression; the second for the (in)equality. $x^2 - 10x + y^2 + 4y + z^2 - 8z + 34$ 0.
Item 18Why is workforce stability an important element of cultural strength?
One problem using the recombinant DNA technique to insert genes from eukaryotic organisms into cells of another kind fo organism such as bacteria is that
Non-descendants property: Starting from the full joint dis- tribution of Bayesian network, prove the non-descendants property. You can assume that the ancestor rule has been proven.
14. Amanda bought g gallons of paint for $16.55 per gallon and t pints of paint thinner for $5.97 per pint. The store also charges a 10% sales tax. PART A Write an expression to represent the total amount that Amanda spent before tax. PART B Amanda has $150 to spend. If she buys 8 gallons of paint, does she has enough money left to buy 2 pints of paint thinner? Explain.
o represent central tendency in scaled data you should use a. the mode b. the arithmetic mean c. the median d. the mean, median and mode are all possible
Let A = {a, b, c, d, f, g, h, k, w, x, y, z}. (1) How many relations are there on A that are reflexive, symmetric, and contain all the elements (a, x), (w, d), and (x, a)?
1.23 Sampling signal and impulse signal—Consider the sampling signal ? ?T(t) = ? ?(t ? kT) k=0 which we will use in the sampling of analog signals later on. (a) Plot ?T(t). Find t SST(t) = ? ?T(?)d? ?? and carefully plot it for all t. What does the resulting signal ss(t) look like? In [18] the author calls it the “stairway to the stars.” Explain. (b) Use MATLAB function stairs to plot ssT(t) for T = 0.1. Determine what signal would be the limit as T ? 0. (c) A sampled signal is ? xS(t) = x(t)?T(t) = ? x(kTs)?(t ? kTs) k=0 Let x(t) = cos(2?t)u(t) and Ts = 0.1. Find the integral t ? xS(t)dt t?Ts and use MATLAB to plot it for 0 ? t ? 10. In a simple way this prob- lem illustrates the operation of a discrete to analog converter which converts a discrete-time into a continuous-time signal (its cousin is the digital to analog converter or DAC).
A single-phase ac voltage controller has a 220-V rms 60-Hz source. The load resistance is 30 ohm. Determine the SCR average current if the delay angle is 45 degrees
30. The band pass filter you designed in (16) can be improved by adding a zero to the system function that forces $H(j\omega) = 0$ when $\omega = 0$. This zero should be a \"hard zero\" on the unit circle at $\omega = 0$. Experiment with moving the poles around until you get a frequency response like that shown below right. Hint: The Poles will be in the pass band. Plot all poles and zeros in the z-plane graph provided below. Pole-Zero Plot in Z-Plane |H(j\omega) | = Magnitude Frequency Response 31. As an example look at the low pass filter at right with a corner frequency at $\omega_c = 1.5$ radians. Notice one pole is placed at $\omega_c = 1.5$ rad. The other pole is placed inside the pass band at $\omega =$ 0.5 which allows for a flat pass band, a desirable feature. Notice the zero at $\omega = 2$ rads which defines the edge of the stop band and produces a steep roll-off in gain, another desirable feature.