A needle of length 10cm floats on water. If the force acting per unit length of the needle is 0.7N/m, calculate the surface tension supporting the weight of the needle

Student

To calculate the surface tension supporting the weight of the needle, we can use the formula:

Surface Tension = Force / Length

In this case, the force acting per unit length of the needle is given as 0.7N/m, and the length of the needle is 10cm or 0.1m. Plugging these values into the formula, we can calculate the surface tension:

Surface Tension = 0.7N/m / 0.1m

Simplifying the equation:

Surface Tension = 7N/m

Therefore, the surface tension supporting the weight of the needle is 7N/m.