A gas flows along the x axis with a speed of V = 5x m/s and a pressure of p = 10x2 N/m2 , where x is in meters.

(a) Determine the time rate of change of pressure at the fixed location x = 1 (i.e., for the particle currently at x=1).

(b) Determine the time rate of change of pressure for a fluid particle flowing past x = 1. (you are fixed at x=1)

(c) Explain without using any equations why the answers to parts (a) and (b) are different.

Physics
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