A pneumatic device produces 35 psi of pressure when a force of 20 pounds is applied. What is the diameter of the cylinder?

0.85 inch

Explanation:

pressure = force/area

35 psi = (20 lb) / A

A = (20 lb) / (35 lb/in^2)

A = 4/7 in^2

The area of the cylinder is 4/7 in^2.

area of circle = pi * r^2

pi * r^2 = 4/7 in^2

r^2 = 4 / (7*pi) in^2

r = sqrt[4 / (7*pi) in^2]

r = 0.4265 inch

d = 2r = 0.85 inch