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If the object is a square with sides of 3cm then the area is 0.0009 square metres.

We assume the pressure was measured on Earth's surface.

Weight (Newtons) = Pressure*area = (21 N/m2)*0.0009 m2 = 0.0189 Newtons.

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Q: What is the weight of an object that has a base which is 3 cm on each side and which exerts a pressure of 21 Pa?
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