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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 football is kicked straight up into the air; it hits the ground 3.4 later. With what speed did it leave the kicker's foot
A ball swings in a vertical circle at the end of a rope 1.30 m long. When the ball is 37.3 ° past the lowest point on its way up, Sketch a vector diagram showing the components of its acceleration
A railroad car containing explosive material is initially traveling south at a speed of 4.5 m/s on level ground. The total mass of the car plus explosives is 2.5 104 kg. what is the final speed of the other piece
A rod of length 5m with miss per unit length=x^1/2 extends in the x-direction. Find the mass and the center of mass of the rod
When the velocities of the particles match, what is their velocity?
The length of a hollow pipe is 658 cm. The air column in the pipe is vibrating and has four nodes. Find the frequency of the sound wave in the pipe
A Boeing 747 jumbo jet with a wingspan of 77 meter is flying in an area where the Earth's B-field is 0.050 mT. find the potential difference induced between its wingtips
A horizontal wire of length 3.0 m carries a current of 6.0 A and is oriented so that the current direction is 50° S of W. What is the size of the force on the wire
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. Find the acceleration of the box
A uniform horizontal beam has a mass of 241 kg and is 10.5 meters long. The beam also carries the following three loads: Load A: 4715 N, 1.26 meters from left end, What are the forces supporting the two ends of the beam
A proton enters a uniform 0.2T magnetic field at right angles. What is the frequency of the proton's subsequent circular orbit
question a child throws a ball downward from a tall building. note that the ball is thrown not dropped and disregard
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