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1- A rectangular slab of rock has edge lengths 28.2 cm, 1.46 m, 1.88 m. When dry, the unit weight of the rock is

1- A rectangular slab of rock has edge lengths 28.2 cm, 1.46 m, 1.88 m. When dry, the unit weight of the rock is 25.7 kN/m. When saturated with oil of unit weight 6.40 kN/m, the unit weight of the rock becomes 28.1 kN/m. Find the total volume of the pores in the rock.

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