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Get Full Access to Fluid Mechanics - 2 Edition - Chapter 6 - Problem 35p
Get Full Access to Fluid Mechanics - 2 Edition - Chapter 6 - Problem 35p

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# A sluice gate, which controls flow rate in a channel by

ISBN: 9780071284219 39

## Solution for problem 35P Chapter 6

Fluid Mechanics | 2nd Edition

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Problem 35P

Problem 35P

A sluice gate, which controls flow rate in a channel by simply raising or lowering a vertical plate, is commonly used in irrigation systems. A force is exerted on the gate due to the difference between the water heights y, and y2 and the flow velocities V1, and V2 upstream and downstream from the gate, respectively. Disregarding the wall shear forces at the channel surfaces, develop relations for V1 V2, and the force acting on a sluice gate of width w during steady and uniform flow.

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Foundations of Cognitive Neuroscience Week 2 David Waxler Ion Channels ● Ion cans be pushed across the membrane ● Ion channels do not actively pump ion in or out ​(passive) Voltage-Gated Ion Channels ● Voltage-Gated Sodium Channels ○ Opens when depolarization occurs (meaning the cell becomes less negative) ○ Fast opening ​ before a millisecond) ○ Quickly inactivates​ nactivation​: closed and locked until it resets) ● Voltage-Gated Potassium Channels ○ Opens when depolarization occurs (meaning the cell becomes less negative) ○ Slow, delayed opening​ (after a millisecond) ○ Stays open until cell repolarizes​ (as long as channels remain open) Gating Rules 1. Changes in voltage can open and close channels 2. If you change the membrane potential, ​a channel can spring open In ​Ligand-Gated channels​, ​a chemical binds to a receptor​ unlocking a channel. It primarily allows a certain type of ion in or out of the cell. Hodgkin-Huxley Cycle ● A positive feedback loop ● Potential leads to depolarization which is followed by Sodium channels opening and Sodium ions flowing into the neuron as a consequence.​ This cycle unleashes a chain of reaction. What would happen if you opened a few voltage-gated Sodium channels Sodium would enter (positive ion) the cell and make the cell less negative (more positive). ​This would depolarize the neuron and if the depolarization is enough to let Sodium in, then that leads to more depolarization and more io

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