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Show that low-density generator-matrix codes are bad. A family of low-density generator-matrix codes is defined by two parameters j, k, which are the column weight and row weight of all rows and columns respectively of G. These weights are fixed, independent of N; for example, (j, k) = (3, 6). [Hint: show that the code has low-weight codewords, then use the argument from p.215.]
What is the distance of closest approach of an alpha particle of speed v= 1.70 x10^7 m/s to a gold nucleus of Z = 79? How close would the alpha get to a copper nucleus of Z = 29? Assume that the gold and copper nuclei remain at rest.
A diver of mass 68 kg stands at the end of a uniform diving board of mass 16 kg and length 4:5 m. The board is attached by two pedestals that are 1:5 m apart, as shown in the gure.
A 0.50 kg ball that is tied to the end of a 1.2 m light cord is revolved in a horizontal plane by the cord making a 30° angle, with the vertical. Decide the ball's speed. If, instead, the ball is revolved so that its speed is 4.0 m/s, what angle does..
Explain why do we place guards over capacitors and where does the guard voltage come into play when using an analogue L-C meter to probe the capacitance?
An observer on Earth sees an alien vessel approach at a speed of 0.60c. Find the relative speed of one vessel as seen by the other
big ben the parliament building tower clock in london has hour and minute hands with lengths of 2.70 m and 4.50 m and
Find the maximum rate of change of a function f = 12x 2 + yz2 with respect to distance at point P(-1, 0, 1). Determine the rate of change of f in the x, y, and z directions. What is the rate of change of f in the direction of point Q(1, 1, 1) from P..
What is the initial energy put into the oscillator by displacing it? f. find the rate at which the energy is being lost due to damping as a function of time.
A large boulder is ejected vertically upward from an underground volcano whose mouth is level with ground. The initial velocity of the boulder 35.5 m/s. How long it takes to reach the maximum height
a sample of serum has a mass of 54 mg and a volume of 225 cm3. what is its density in gcm3? what would be the mass of
Suppose you form a dipole from two point charges (with a magnitude of charge, q). the postive charge is located at the point x=y=0, z=d/2. and the negative charge is located at x=y=0, z=-d/2. determine the magnitude of the electric field along the..
An RLC series circuit has R=1.35 kOhm, L=225 mH, and C=2.50 uF (micro farads) and is connected across a 60 Hz power supply. find the reactances of the capacitor and inductor
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