An eight-pole, three-phase, 230 v, 60 hz, y-connected, wound-rotor induction motor has the following model impedances (in ohms per phase) referred to the stator circuit: r1-0.78 ω xi-0.56 ω a. calculate the maximum torque developed by this motor. b. calculate the slip at which the motor develops maximum torque c. calculate the starting torque of this motor. d. repeat a) through c) with the rotor resistance doubled. e. using excel or matlab, plot the torque-speed characteristics of this motor both with the original rotor resistance and with the rotor resistance doubled. (note: use the exact equations for vti and zth)

Fft review: linspace, fs, fftshift, nfft 1. generate one second of a cosine of w,-10hz sampled at f, = 100hz and assign it to x. define a tt as your time axis 2. take 64 points fft. 3. as you remember, the dft (which the fft implements) computes n samples of s2t where k-0,1,2, n -1. plot the magnitude of this 64-points fft at range 0 to 63, what do you think of this graph? 4â·to get the x-axis into a hz-frequency form, plot this 64-points fft between-50 to 50 (the 100hz sampling rate) and have n-points between them. 5. according to your figure, what frequency is this cosine wave at? 6. remember that the fft is evaluating from 0 to 2ď€. we are used to viewing graphs from-ď€ to ď€. therefore, you need to shift your graph. 7. now according to your shifted graph. what frequency is this at? 8. note that the spikes have long drop-offs? try a 1024-point dft. note that the peak is closer to 10 and the drop-off is quicker. although, now sidelobes are an issue

In order for the bug to fly through the air a force has to push the bug forward. identify this force. how does the bug produce

Which of these is the best way to manage a natural resource