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A tank is initially filled with 1000 litres of brine, containing 0.15kg of salt per litre. Fresh brine containing o.25kg of salt per litre runs into the tank at the rate of 4L/s, and hte mixture (kept uniform by vigorious stirring) runs out at the same rate. Show that if Q (in kg) is the amount of salt in the tank at time t (in s) then dQ/dt = 1 - Q/250?
Give three advantages of a three-phase system over a single-phase system There are two basic three-phase connections, the wye connection and the delta connection. Draw a labelled diagram showing the wye connection
A LINEAR ONE-PORT IS MODELLED WITH A: 10V AT LOADRESISTANCE=10kilo ohm AND :0.5mA WITH LOAD RESISTANCE=100kiloohm. Find the equivalent resistance of the given one-port.
Assume that the size of each track is the same. Compute the size of each cylinder on the disk both in terms of the number of bytes and the number of blocks. Also, compute the size of each track.
The phasor voltage across a certain load is V = 1200√2
A two-element array made of two λ/2 side by side dipoles with spacing equal to .125 λ , the two elements are fed by currents equal in magnitude but having a phase difference such that : I2=I1 e(j.75π)
Silicon has an absorption co-efficient of 850 cm-1 at a wavelength of 805 nm. Light of intensity 1 W/m2 at this wavelength is directed at normal incidence onto a polished silicon wafer of thickness 0.5 mm.a. Assuming a top surface reflectance of 30..
The flat circular disk rotates about a vertical axis through O with a slowly increasing angular velocity ?. Prior to rotation, each of the 0.44-kg sliding blocks has the position x = 22 mm with no force in its attached spring.
A CB transmitter is rated to supply 4 W of carrier power to a 50 Ohm load while operating from a power supply that provides 13.8 V. The nominal supply current is 1 A without modulation and 1.8 A with 80 % modulation.
A 200 ft length of solid copper wire is measured to have a resistance of .500 Ohms. a. Determine the cross sectional area of the wire in both square mils and in circular mils. b. Determine the diameter of the wire in mils and in inches.
The steady-state electron distribution in silicon can be approximated by a linear function of x. The maximum electron concentration occurs at x = 0 and is n(0) = 2.0 x 1016cm-3. At x = 0.012cm, the electron concentration is 5.0 x 1015cm-3.
Consider a 1-cm thick slab of crown glass, with index of refraction n =1.52. (a) If a beam of visible light at 500nm is normally incident from one side of the slab, what percentage of the incident power transmits to the other side
Let p represent the true portion of unauthorized uses of business websites in 2008 that came from inside the company. (a) Calculate a point estimate for p. (b) Set up the null and alternative hypothesis to test whether the value of p differs from ..
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