An isosceles triangular plates of base 3 m and altitude 3 m is immersed in oil vertically with its base coinciding with the free surface of the oil of relative density 0.8. Determine the total thrust.

Explanation

To determine the total thrust exerted by the oil on the isosceles triangular plate, we can follow these steps:

### Step 1: Determine the density of the oil
The relative density of the oil is given as 0.8. The density of water is approximately \(1000 \, \text{kg/m}^3\). Therefore, the density of the oil can be calculated as:

\[ \rho_{\text{oil}} = \text{Relative Density} \times \text{Density of Water} = 0.8 \times 1000 \, \text{kg/m}^3 = 800 \, \text{kg/m}^3 \]
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