A stone is dropped from rest down a well and a splash is heard 3 seconds later (a)Determine the depth of the well. (b)How fast was the stone moving when it hit the water in the well?
2. A Belizean Bimma accelerates uniformly at a rate of 6 ms-2over a track 50 m long. By the end of the track the Belizean Bimma was moving at a velocity of 90 km/h.(a)What was the initial velocity of the Belizean Bimma?
(b)How long did it take the Belizean Bimma to travel the length of the track?

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

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.

Smallest intensity of a stimulus that you can detect 50 percent of the time is