The stress on the material of a large circular metal pipe varies jointly with the internal pressure and the internal diameter of the pipe and inversely with the thickness of the material of the pipe. For a particular type of pipe, the stress is 103 pounds per square inch when the diameter is 5 inches, the thickness is 0.5 inches, and the internal pressure is 31 pounds per square inch. Find the necessary thickness for a pipe if its diameter is 6 inches, the internal pressure is 36 pounds per square inch, and the pipe needs to be able to handle overall stress of 126 pounds per square inch. The material of the pipe needs to be [text box] inches thick. {Give at least 3 decimal places.} [Submit Question Button]

The electrostatic force between two electrically charged particles varies inversely as the square of the distance between them. If two charged particles are 1.3 meters apart and the electrostatic force between them is 2 Newtons (a standard unit of force in Physics), what is (A) the constant of proportionality k , and (B) what is the force between them if the distance is changed to 2.3 meters

A classroom of 30 students has an air conditioning system that moves 450 cubic feet of air per minute. Determine the rate of ventilation per child.