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Question:

Physics help please!?!?

Physics help please!?!?

Answer:

Specific gravity of 2.7 means that one litre of aluminium has a mass of 2.7kgThe cube has volume of 27 litres (because 1litre1dm^3, and 1dm10cm) and therefore a mass of 27x2.7 72.9kgAssuming g9.8, the weight is given by Wmg as 714.42NPressure is force per unit areaThe area of the cube in contact with ground is 0.3x0.30.09m^2Therefore the pressure the cube exerts on the ground is 714/0.097938Pa(slightly different answer, probably due to rounding errors or different value for g)

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