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Espresso is a coffee beverage made by forcing steam through finely ground coffee beans. Modern espresso makers generate steam at very high pressures and temperatures, but in this problem we'll consider a low-tech espresso machine that only generates steam at 100 Celcius and atomospheric pressure--not much good for making your favorite coffee beverage.
The amount of heat Q needed to turn a mass, m, of room temperature ( T_1) water into steam at 100 Celcius. ( T_2) can be found using the specific heat, c, of water and the heat of vaporization, H_v, of water at 1 atmosphere of pressure.
Suppose that a commercial espresso machine in a coffee shop turns 1.50 kg of water at 22.0 Celcius into steam at 100 Celcius. If c = 4187 J/(kg * C) and H_v=2,258 kJ/kg, how much heat Q is absorbed by the water from the heating resistor inside the machine?
A rectangular loop of wire containing a high resistance voltmeter has corners initially at (a/2, b/2, 0), (-a/2, b/2, 0), (-a/2, -b/2, 0) and (a/2,-b/2, 0). The loop begins to rotate about the x axis at constant angular velocity w.
A horizontal beam of negligible weight is 38ft long andis supported by columns on each side. a verticle load of 68000lbs is applied to the beam at a distance X from the left end. find the X in ft so that raction at the left column is 47000 lbs
A collector modulated transmitter has a supply voltage of 48 V and an average collector current of 600 mA. What is the input power to the transmitter How much modulating signal power is needed to produce 100 percent modulation
Create the Walsh code matrix for a W16. (c) For IS-95, on the forward link, list the Walsh code assigned to the various logical channels (hint: there are 64 Walsh codes)
a) Write the system of linear equations in the form of Ax = b: (b) Use Guass-Jordan method to find A inverse (c) Use A inverse to solve the system of equations. -2x1 + x2 +x3 = -12 4x1 + 2x2 + 4x3 = 7 -x1 + x2 + 2x3 = -3
Tones Input In To An Amplifier, Suppose two tones are input in to an amplifier. The tones are pure sinusoids with one at frequencies 8GHz and the other at frequency 8.03GHz,(delta f =0.03GHz).
You have an amplifer with a nominal open-loop gain of 1000 (A = 1000), but the variance in the gain is 20% (meaning that the open-loop gain ranges in value from 800 to 1200). You want to use feedback to try to desensitize the gain.
Two point charges q1 = 2.0 C and q2 = 1.0 are fixed in a plane at the positions given by the Cartesian coordinates shown in the figure at right. Consider that they are in a vacuum, where ko = 9.0 × 109 N.m2/C2.
A radio receiver has a noise power N = kTB watts, with T = 100 K and B = 1.0 MHz. The value of k is 1.38 x 10^-23 J/K. What is the noise power in dBW?
The gain of the antennas must be increased when the TDMA system described in part (d) is used because the bit rate is higher than with FDMA and the noise power in the receiver is therefore higher
A 34.3 kg child starting from rest slides down a water slide with a vertical height of 20.3 m. (a) What is the child's speed halfway down the slide's vertical distance (b) What is the child's speed three-quarters of the way down
two loads connected in parallel are supplied from a single phase 240v rms source. the two loads draw a total real power of 400 kw at a power factor of 0.8 lagging. one of the loads draws 120 kw at a power factor of 0.96 leading.
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