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College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

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BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

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.

To determine

The reason for the water that has emerged from a hose into the atmosphere has a gauge pressure of zero and the reason for the force felt by the hands when kept in front of the emerging stream.

Explanation

When the hand is kept in front of emerging stream, it feels a force but the water has a gauge pressure of zero. This can be explained by the use of Bernoulli's equation.

From the Bernoulli's equation,

  P1+12ρv12=P2+12ρv22   ......... (1)

Here,

  • P1 is the pressure inside hose nozzle.
  • v1 velocity of water inside the nozzle.
  • P2 is the pressure outside the nozzle

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