SOLVED: A manometer measures a pressure difference as 40 inches of water. What is this pressure difference in poundforce per square inch, psi?

McMurry - Chemistry 8th Edition - Chapter 10 Problem 34

SOLVED: Tire pressure gauges are often calibrated in pounds per squareinch. An automobile tire is inflated to a pressure of 30.0 psi.Express this pressure in atmospheres and in millimeters Hg.Hint:

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SOLVED:Each rear tire on an experimental airplane is supposed to be filled to a pressure of 40 pound per square inch (psi). Let X denote the actual air pressure for the right tire and Y denote the actual air pressure for the left tire. Suppose that X and Y are random variables with the joint density f(x, y)={ k(x^2 y^2), 30 ≤ x<50; 30 ≤ y<50; 0, elsewhere.. (a) Find k. (b) Find P(30 ≤X ≤40 and 40 ≤Y<50) (c) Find the probability that both tires are underfilled.