Hannah is driving a car up a hill. She observes that the car tends to slow down if she does not press down on the accelerator. Hannah sugests that friction between the and the road is causing the car to slow down. Which best explains why Hannah's suggestion is not a scientific theory?

A= Hannah's suggestion is a good idea held by an individual and based on a life experience.

B=Hannah is not a well paid scientist

C= Hannah's suggestion is a claim that has been well tested

D=Hannah's suggestion is not a well-supported and widely accepted explanation

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

What properties of a moving object are used in determining the object's energy of motion

More solar radiation is absorbed by earth’s surface than by