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Water pressure at the bottom of 3000Pa container p = rhogh = 3000 pa.

The water pressure at the bottom of 90N container is f = PS = 3000pa * 0.03m 2 = 90n.

70N plate is subjected to the pressure of the container, F=G =70N in total.

The pressure of 2333.3Pa wood subjected to container P = F/S = 70N/0.03 m 2 = 7000/3 pa is about 2333.3Pa.

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