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Physics / College Physics 1 / Chapter 12 / Problem 19

College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs

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Water that has emerged from a hose into the atmosphere has

Chapter 12, Problem 19

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QUESTION:

Problem 19CQ

Water that has emerged from a hose into the atmosphere has a gauge pressure of zero. Why? When you put your hand in front of the emerging stream you feel a force, yet the water’s gauge pressure is zero. Explain where the force comes from in terms of energy.

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QUESTION:

Problem 19CQ

Water that has emerged from a hose into the atmosphere has a gauge pressure of zero. Why? When you put your hand in front of the emerging stream you feel a force, yet the water’s gauge pressure is zero. Explain where the force comes from in terms of energy.

ANSWER:

Solution 19CQ

Step 1 of 4

Gauge pressure is defined as as the difference between the absolute pressure and the atmospheric pressure. Mathematically,

Gauge pressure = absolute pressure - atmospheric pressure

We are required to determine why the gauge pressure of water coming out into the atmosphere from a hose is zero.

We are also required to investigate the origin of the force we feel when we hold our hand in front of the water stream.

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