Question

a plumber helper is a rubber cup with a 5 inches, what is the maximum suction it can exert on a clogged pipe. How much force is needed on the handle to produce this suction

Answer 1

Answer on Question #84740, Physics / Mechanics | Relativity

**Question:**

a plumber helper is a rubber cup with a 5 inches, what is the maximum suction it can exert on a clogged pipe. How much force is needed on the handle to produce this suction

**Solution:**

To give a precise answer some dimensions are to be known but for the upper level the following – rather rough – estimation may be taken: the maximum suction F app. equals to the needed force $f = 0.25\pi D^2 p_A = 0.25 \cdot 3.14 \cdot 25 \cdot 2.54^2 \cdot 10^{-4} \cdot 10^5 = 1.27$ (kN), where $p_A$ - atmospheric pressure, D - plumber helper diameter.

**The answer:**

$$F \approx f = 1.27\, \text{kN}$$

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