Có 4 kg khí lý tưởng chứa trong hệ kín, nhiệt độ ban đầu của khí t1 = 300 oC giãn nở theo quá trình đa biến thuận nghịch đến trạng thái 2 có t2 = 60 oC và thể tích sau khi giãn nở gấp ba lần thể tích ban đầu. Trong quá trình giãn nở khí nhận một nhiệt lượng 167,472 kJ và sinh công thể tích 837,26 kJ. xác định số mũ đa biến của quá trình ?
tìm số mũ đoạn nhiệt ?
xác định lượng biến đổi nội năng, entanpy, entropy ?

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

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

Gather reliable information to brent make his decision. to gather this information, use newspapers, call insurance companies or look at their web sites, and review consumer magazines and web sites. also, look at the manufacturer web site or for information about gas mileage. list the sources you use and take notes.