Fluid MechanicsMedium
Question
You are studying for an exam on the eight floor of your luxurious apartment building. You look out from the window and notice that one of your neighbours is giving a party on the ground-floor terrace and has placed a huge punch bowl full of an interesting looking beverage (specific gravity 1) directly below your window. You quickly string together 80 drinking straws to form a giant straw that can reach the punch bowl 80 feet below. You dip the straw into the punch and begin to suck. When you use a single drinking straw to drink something, it takes you 0.1 seconds to raise the liquid to your lips. But when you use this giant drinking straw,
Options
A.you find that you can′t raise the liquid to your lips no matter how hard you try.
B.it takes you 8 seconds to raise the liquid to your lips.
C.it takes you 800 seconds to raise the liquid to your lips.
D.it takes you 640 seconds to raise the liquid to your lips.
Solution
The liquid will rise up to 80 feet height only if the pressure at that point is less than P0 by an amount ρw.g.h. ie; Pressure at point A should be PA = P0 − ρgh < 0 (As ρgh = 103 × 10 × 80 > 105 (P0)) and it is not possible for us to make the pressure negative.
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