A circular plate of radius 4 cm and weight W is made to rest on the surface of water. If a minimum pull of W + F is required to clear the plate off the water surface then find F. Given surface tension of water `S_(w) = 0.072 N m^(-1)`

Explanation

To solve the problem, we need to determine the force \( F \) that must be applied to lift a circular plate of radius 4 cm resting on the surface of water, given the surface tension of water \( S_w = 0.072 \, \text{N/m} \).

### Step-by-Step Solution:

1. **Convert the radius from centimeters to meters**:
\[ R = 4 \, \text{cm} = 4 \times 10^{-2} \, \text{m} = 0.04 \, \text{m} \]
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