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A container with a capacity of 5 liters contains air under pressure of 76 cmhg and is closed by a section valve of 10 cm² on which a force of 30 kgf is applied. Calculate the weight of air that needs to be introduced into the receiver so that the valve is lifted. The weight of one liter of air under normal pressure is 1.293 gf.
Answer: 12.296gf
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