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A press delivers a force of 8000 N throughout a distance of 18 mm each stroke. Select a number of strokes per minute and determine the rate of work output per second. If the press efficiency is 90%, what average torque must be provided by a 1750-rpm driving motor?
Consider a Si p-n junction at room temperature. If the doping concentrations are NA=1016 cm-3 and ND=1015 cm-3, what is the depletion width also known as space charge width Also find the maximum electric field.
a. How many poles are on the rotor winding of the induction motor? b. If the stator field in the induction machine rotates in a clockwise direction, what is the rotation direction of its rotor?
(a) What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 9.38 m/s when going down a slope for 3.89 s (b) How far does the skier travel in this time
Assessment on Electricity and Circuit Theory, What part of a cable are insulators and conductors? Describe, in terms of charged particles, why some objects are electrically attracted to each other, while others repel each other?
An electric flux density is given by D = D0 a, where D0 is a given constant. (a) What charge density generates this field (b) For the specified field, what total charge is contained within a cylinder of radius a and height b
A DC motor has an input of 0-5V and runs at speeds from o to 80 rpm. What duty cycle signal is required to run the motor at approximately 20 rpm
where fc is the carrier frequency, Ac is the carrier amplitude, µ is the modulation index, and x(t) is the baseband message signal. We assume that x(t) has absolute bandwidth W
A series circuit consisting of a 0.398-henry inductor and a 212-µF capacitor is connected to a 125-volt variable frequency source. At what frequency will the circuit take a lagging current of 2.5 A
Find the sketch the convolution of the given pairs of functions. You can use either the integration or the graphical method for convolution. x(t) = 2e-3t sin(2t) u(t) h(t) = u(t) + 4d(t-2) find y(t) = x(t) * h(t)
(i) an antenna connector and feedline with an attenuation of 1.5dB; a low-noise amplifier with a noise figure of 4 dB and a gain of 10 dB, and a unit gain mixer with a noise figure of 1 dB. What is the noise figure of the receiver
a lightning bolt carrying 20000 A lasts for 20 microseconds. if the lightning strikes a tractor, determine the charge on the tractor if the tires are assumed to be perfect insulators.
Surface integral for jet engine. The air-gas exhaust velocity from a jet engine varies linearly from a maximum of 300 m/s at the center of the circular exhaust opening to zero at the edges. If the exhaust diameter is 1.6 m, find thq exhaust flow.
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