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    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
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    (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.

    What answer did you get?
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    I got 500N/m2
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    (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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