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Question: A safety valve shown in Fig. Prob. is 3 in in diameter and is just on the point of blowing off steam. The lever weighs 7 lb and its center of weight is at G. The weight of the valve is 3 lb. If the weight on the end of the lever is 50 lb, find the pressure of the steam in the boiler. If the steam is to blow off at 80 psi, find the amount of the weight on the end of the lever.

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