Fluids have a surface tension, which means that requires that creating more surface requires energy. In order to create more water surface (for example, water spreading over a table top), an energy cost must be paid of about 73 mJ/m2. Lets say you have water in a rectangular container that is 35 cm by 20 cm. Now you want to stretch the longer side by 4 cm. With what force does the surface tension of the water resist that change? Answer in Newtons to four decimal places.

Fluids have a surface tension, which means that requires that creating more surface requires energy. In order to create more water surface (for example, water spreading over a table top), an energy cost must be paid of about 73 mJ/m2. Lets say you have water in a rectangular container that is 35 cm by 20 cm. Now you want to stretch the longer side by 4 cm. With what force does the surface tension of the water resist that change? Answer in Newtons to four decimal places.

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Concept explainers

Fluid Pressure

The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.

Gauge Pressure

Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.

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Fluids have a surface tension, which means that requires that
creating more surface requires energy. In order to create more
water surface (for example, water spreading over a table top),
an energy cost must be paid of about 73 mJ/m2. Lets say you
have water in a rectangular container that is 35 cm by 20 cm.
Now you want to stretch the longer side by 4 cm. With what
force does the surface tension of the water resist that change?
Answer in Newtons to four decimal places.

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