In the illustrated system, what pressure will be indicated on the gage if the load (x) is 632 lb (286.9 kg) and the piston area (y) is 1.5 sq. in (9.6 sq. cm)? See illustration GS-0062.
• Relationship in hydraulics: Pressure = Force ÷ Area • How the load weight (X in lbs) becomes the force acting on the piston • Recognizing that the gage pressure (Z) in a static hydraulic system will be the same as the pressure under the piston
• What force is the 632 lb load exerting on the piston, and how does that relate to the fluid underneath it? • If the piston area is 1.5 sq. in, how many pounds of force are there per square inch when the system is just holding the load still? • Once you compute the pressure in psi from the load and area, which answer choice most closely matches your computed value?
• Use P = F ÷ A with F in pounds and A in square inches to get pressure in psi • Confirm that you are using the piston area (1.5 sq. in), not the total cylinder area or rod area • Make sure you do no unit conversions to metric until after you find the pressure in psi, since the answer choices already give psi values
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