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Water flows smoothly through the pipe sh...

Water flows smoothly through the pipe shown in the figure , descending in the process . Rank the four numbered sections of pipe according to (a) the volume flow rate `R_(v)` through them , (b) the flow speed v through them and (c) the water pressure p within them , greatest first .

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(a) All tie , (b) 1 then 2 and 3 tie , 4 (wider means slower) , (c) 4 , 3 , 2 , 1 (wider and lower mean more pressure) .
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