Question

The pressure , P, measured in pounds per square inch (psi ) on an object under water varies directly with its depth , d measured in feet . If the pressure on an object at a depth of 20 feet is 8.6 psi, what is the pressure on an object at a depth of 25 feet ?​

Answer 1

• 10.75 psi

Explanation:

Let the equation be:

• y = kx, where y- pressure, k- constant, x - depth

For the depth of 20 ft, the equation is:

• 8.6 = 20k
• k = 8.6/20
• k = 0.43

For the depth of 25 ft, the pressure is:

• y = 0.43*25 = 10.75 psi