How is the efficiency of a thermodynamic engine defined? (select all correct answers.) view available hint(s) how is the efficiency of a thermodynamic engine defined? (select all correct answers.) it is the ratio of how much thermal energy the engine is able to utilize to how much it actually used. it is the ratio of the energy supplied to the engine to the unit work performed by it. it is the ratio of the work done by the working substance on the environment to the energy transferred from the hot reservoir to the working substance. it is the ratio of how much work the thermodynamic engine is capable of performing to how much work it actually performed. it is the ratio of the useful work done by the engine to the energy supplied to it.

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

What is hidden during a lunar eclipse? isn't the moon hidden?

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