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#1. If 40 psi of pressure is applied to a brake chamber diaphragm of 30 square inches, the maximum force exerted would be
“Psi” stands for “pounds per square inch”: the force in pounds that is applied to each square inch. In this case, the pressure is 40 pounds per square inch, which is applied to an area of 30 square inches. Hence, 40 pounds per square inch × 30 square inches = 1,200 pounds