A water strider bug is supported on the surface of a pond by surface tension acting along the interface between the water and the bug’s legs. Assume the bug weighs 10−4 N and the surface tension force acts vertically upward. Determine the minimum length of the interface needed to support the bug

minimum interface length = 1.36 mm

Explanation:

given data

weight of the bug = N

solution

we will apply here Surface Tension formula that is

Surface Tension ,σ = Force ÷ length      ........................1

and we consider here surface tension for water is 7.34 × N/m

so that here minimum interface length needed to support the bug is

minimum interface length = Force ÷ σ

minimum interface length =  ÷ 7.34 ×

minimum interface length = 1.36 mm

the answer would be 32*f

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