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A three-phase 1750rpm 460V 60Hz 4-pole, Y-connected induction motor has the following parameters: Rs =0.66,Rr =0.38?,Xs =1.14?,Xr =1.71?, andXm=33.2?. The motor is controlled by varying both the voltage and frequency. The volts/hertz ratio, which corresponds to the rated voltage and rated frequency, is maintained constant. Calculate the maximum torque and the corresponding speed for 60Hz and 30Hz.
A heavy rainstorm dumps 1.0 cm of rain on a city 4 km wide and 10 km long in a 2-h period. (A) How many metric tons (1 metric ton = 103 kg) of water fell on the city? (1 cm3 of water has a mass of 1 gram = 10-3 kg.) Answer in tons and (B) How many ga..
When at rest, a proton experiences a net electromagnetic force that has a magnitude of 7.2 x 10^-4 N and points in the positive x-direction. Find the magnitude and direction of the magnetic field
A car makes a trip due north for three-fourths of the time and duesouth one-fourth of the time. The average northward velocity has amagnitude of 24 m/s, and the averagesouthward velocity has a magnitude of 23 m/s. What is the average velocity (magnit..
When customers arrive at gilley's ice cream shop, they take a number and wait to be called to purchase ice cream from one of the three counter serves. on summer days between 3-10pm, customers arrive at the rate 36 per hour - poisson distributed. it t..
A beetle and a spider are sitting on a hinged door. The beetle is in the middle of the door and the spider is near the handle, what is the angular speed and tangantial Speed of the spider
A parallel plate capacitor has a plate area of 0.705m2 and a plate separation of 2.05mm. What is its capacitance
A gasoline engine absorbs 4190 J of heat and performs 3170 J of mechanical work for each turn of the engine shaft
A 2.0 kg brick is pushed horizontally off the top of a 12.0 m tall building. The brick lands 3.2 m from the side of the building. what was the velocity at which the brick was pushed
It's possible to use the ideal-gas law to show that the density of the earth's atmosphere decreases exponentially with height, Determine the value of z0
A body oscillates with simple harmonic motion according to x = (4.0 m) cos[(2.0pi rad/s)t + pi/3 rad]. At t = 4.50s , What is the phase of the motion
A tennis player receives a shot with the ball (0.060 0 kg) traveling horizontally at 52.5 m/s and returns the shot with the ball traveling horizontally at 38.5 m/s in the opposite direction
Two identical charged spheres suspended from a common point by two massless strings of length 'l' initially at a distance 'd' apart because of their mutual repulsion. The charge begins to leak from both spheres at constant rate. as a result ch..
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