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# pressure watch

1. a rectangular concrete paving slab of the weight of 1200N has sides of length 0.60m and 0.40 and a thickness of 0.05m. what is the pressure on it when it is laid flat on a bed of sand
2. (Original post by ginger_ninja_1)
a rectangular concrete paving slab of the weight of 1200N has sides of length 0.60m and 0.40 and a thickness of 0.05m. what is the pressure on it when it is laid flat on a bed of sand
How far have you got with this? Show your working and we can help from there.

To get you going:

Pressure (measured in Pascal's) = Force per unit Area.

Newton's are the derived SI unit of force acting on an object under the influence of Earths gravity.

Force (Newtons) = mass x gravitational acceleration

From above, you can calculate the mass of the concrete slab.

Finally, you need to calculate the surface area of the concrete slab (length x width) and use both the mass and surface area to substitute these values back into the pressure definition given at the start.

3. I got 500N/m2
4. (Original post by ginger_ninja_1)
I got 500N/m2
Correct if you used g = 10ms-2.

Closer to 509N/m2 when using g = 9.81 ms-2.

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