Which of the following is a characteristic of a scientific practice? A It makes large and unrealistic claims.

B It avoids criticisms.

C It uses logic and reasoning.

D It chooses to share only supporting evidence.

Which of the following is a characteristic of a scientific practice?

A It expects sharing all data and not just interesting data.

B It seeks criticism to improve the process.

C It changes as new evidence deepens.

D It relies on personal experiences to support claims.

When does a claim or idea become a theory?

A after an observation is made from an experimental set-up

B after few predictions are recorded based on observations

C after a lot of empirical evidence supporting the idea has been found

D after one possible explanation for the phenomenon is offered

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

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat