Suppose that you want to freeze 1 kg of water for a party, and only have 5 minutes to do it. relying on nothing but your keen physical abilities, a dixicup, duct tape and a piece of string, you manage to build a refrigerator unit which can do the job. the temperature inside the refrigeration unit is 273 k, and the temperature outside is 350 k. since you are a brilliant uiuc student, assume that your refrigerator has the maximum possible efficiency. the latent heat of fusion of water is 3.33×105 j/kg assume that the initial temperature of the water is 273 k. 1) what is the heat flow ( q_ cold/time ) out of the cold well per second in j/s?

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

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

Which is not one of the major climate zones? question 3 options: rain forest polar tropical temperate