AP Physics B&C by Greg Jacobs

Author:Greg Jacobs
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2010-04-16T04:00:00+00:00

The pressure P = P0 + ρgh is called the absolute pressure of a fluid. Gauge pressure refers to just the pgh part of the absolute pressure. These are terms to know because they might show up on the AP exam.

The varsity football team’s water cooler is a plastic cylinder 70 cm high with a 30-cm radius. A 2-cm diameter hole is cut near the bottom for water to flow out. This hole is plugged. What is the force on the plug due to the water (density = 1,000 kg/m3) in the cooler when the cooler is full?

Let’s start by calculating the water pressure at the bottom of the container: P = P0 + pgh. P 0 is the pressure at the top of the container, which we’ll assume is atmospheric pressure (atmospheric pressure is available on the constant sheet). And h is the depth of the cooler, 70 cm, which in standard units is 0.70 m.

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