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Question: Air flows at a velocity of 90 m/s down a 20 cm diameter pipe. The air is at a pressure of 120 kPa and a temperature of 30°C. A valve at the end of the pipe is suddenly closed. This valve is held in place by eight mild steel bolts each with a diameter of 12 mm. Will the bolts hold the valve without yielding? Assume that the pipe is discharging the air to the atmosphere and that the ambient pressure is 101 kPa. It will be necessary to look up the yield strength of the steel to answer this question.

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