## Easy Ohms Law Tutorial Neuroscience and Cardiac Physiology physics application

Ohms Law Applied to Neuro and Cardio physiology From Physics, we know that Voltage equals flow times resistance or V equals IR. Voltage means difference. In an electrical battery, there is a difference in charge. Let's say one side of the battery has 20 electrons, and the other side has 600 electrons. If you connect the two sides with a wire, the electrons will flow down gradient until each side is equal at 310 electrons. You can also put a light bulb in the wire, so as the electrons flow through the bulb, it gives off light.

If there are more electrons on one side thus a greater voltage, the electrons will flow faster giving off more light. If there is more resistance because the wire is rough and less conductive, the electrons will struggle to flow down the wire This slow flow of electrons means that the battery will last longer, but the bulb won't glow as brightly. This electrical concept can be applied to biology. Humans aren't made of batteries and wires, but we do havecharge gradients and channels. Instead of electrons, there are 20 sodium ions inside a cell,.

And 600 sodium ions outside. And instead of a wire, channels connect the two sides. When you open the channels, the sodium flows in to the cell. If you increase the Voltage or ion gradient, the ions will flow more quickly. If you increase resistance by blocking channels with an antagonist, the signal will be conducted more slowly. Ohms law doesn't just apply to electrical systems. The heart muscle also has a voltage instead of electricity, it has a pressure differential. When the heart contracts, there is a lot of pressure,.

When it relaxes there is less pressure. Instead of electrons flowing, there are blood cells that flow not through a wire, but through arteries If you want blood to flow more quickly, you can increase the voltage by having the heart squeeze harder, like during exercise. Clogging arteries with fat creates more resistance, slowing blood flow. To maintain blood supply, your heart contracts with greater force, increasing the voltage to overcome this increased resistance. This is MUCH more work for your heart, contracting this hard every second of every day, which is why blocking your arteries with fat,.

### physics pressure of heels

So the sales have been going down, what do you all recommend deng deng deng deng I can help WHY HEELS LEMME EXPLAIN Do you know The pressure of heels is equivalent to an elephants pressure Now we are measuring the heels And now we are measuring the flats since the area of the heels is very small, the pressure apply on the heels is humongous However, The area of the flats is larger than the heels so the pressure is smaller! And thats the calculation folks Hmmmmmm So i think i will be taking the heels!.

#### Definition of Pressure JP02A

Let us now understand and write down the definition of pressure. about pressure we can write. pressure is the ratio of. applied. normal force. acting. on an area. to the area. on which it is applied. so here we can write on any surface when we define pressure it is written as the normal force. which is applied, on the given surface divided by the area of surface. here we can also defined normal force which you might be aware about it is the force. which is applied. perpendicular to. a given surface. is called. normal force. so the amount.

#### Specific Gravity

MUSIC PLAYING THROUGHOUT What does specific gravity mean The specific gravity of an object is the density of that object divided by the density of water. The density of water is 1,000 kilograms per meter cubed. For instance, the density of gold is 19,300 kilograms per meter cubed. So the specific gravity of gold is 19.3. The density of ketchup is 1,400 kilograms per meter cubed. So the specific gravity of ketchup up is 1.4. Note, there's no units for specific gravity, because it's the ratio of one density to another density.

So the units cancel each other out. OK, so why even bother defining something called the specific gravity Well, one really cool thing about specific gravity is that, for something that floats, the specific gravity tells you the fraction of that object that will be below the water while it's floating. For instance, say you let a cube of wood with specific gravity 0.2 float in water. Since the specific gravity is 0.2, that means that 20 of the total volume of this wood is going to be submerged below the water while it's floating.

If the cube of wood had a specific gravity of 0.6, 60 of the wood would be submerged beneath the water's surface. Ice has a density of about 920 kilograms per meter cubed. That means ice has a specific gravity of 0.92. And that's why 92 of an iceberg's volume is actually underneath the water. But what if we were to use a cube that had a density of 2,700 kilograms per meter cubed The specific gravity would be 2.7, which means that 270 of this cube would be submerged beneath the water.

But you can't have more than 100 of an object submerged. Even if the object were to sink, the maximum amount submerged would be 100. So if the specific gravity of an object is greater than 1, that object is going to sink if placed freely in water. And it'll have exactly 100 of its volume submerged. Usually when people are referring to the specific gravity, they're referring to the density of the object divided by the density of water. But sometimes it's useful to define the specific gravity with respect to a liquid that's different from water.

#### 5. Physics Viscosity Critical Velocity and Reynolds Number by Ashish Arora

Let's discus critical velocity and Reynolds number for a flowing fluid , as we know, and we have already discussed it , in case of fluid dynamics that. upto, a specific, flow velocity , fluid flow, remains streamline , and, beyond a critical velocity , it becomes , turbulent. upto a limit we can say the fluid flow remains, streamline, and beyond a critical velocity it become turbulent. and experimentally the critical velocity is obtained, and we some factors, these are , it was established that the critical velocity upto which the.

Flow remains streamline and if the flow velocity is increased beyond this limit it becomes turbulent , it is directly proportional to the coefficient of viscosity , it is obtained , that , second factor it depends on is , it is inversely proportional to the density of the fluid , and the third point is, this critical velocity is inversely proportional to, the radius of tube in which the fluid is moving. and from these we can combine , and this critical velocity can be written as , we just include.

The proportionality constant nr , multiplied by, ita , by r rho , this is the expression we get for critical velocity of fluid , where this n r is called , Reynolds number. the value of Reynolds number varies from fluid to fluid , for some fluids it is low , so for a fluid if the Reynolds number is low the critical velocity is less, it means if we slightly increase the flow velocity of fluid it flow become turbulent, and for fluids when Reynolds number is high , Reynolds number depends on inter molecular forces of fluids.

#### Excess Pressure Inside a Soap Bubble GAST4XA

Lets discuss the , concept of excess pressure inside a bubble. if we talk about the soap bubble or a bubble made up of a liquid film. and say we consider the wall thickness of the bubble to be very small compare to its radius. in this situation again due to surface tension. the. liquid surface. inside as well as outside on the, soap bubble or the liquid bubble will have a tendency to contract. and due to which inside, say if there is a point ay and outside there is a point b, obviously due to this contracting tendency pressure.

At ay will be more then pressure at b. and at some point when the bubble will be in equilibrium we can say. the excess pressure inside is balance by the force of the surfacetension. like what we have discussed in the case of excess pressure inside a liquid drop. here also to analyze this excess pressure we divide the. bubble in two hemispherical sections. and here you can see. if i just draw hemispherical section it'll look like this. this is the hemispherical. film of the , soap bubble or the liquid bubble. and in this situation we.

Can say. the right part will exert a force. on it in outward direction due to excess pressure. and this outward force can be simply written as excess pressure multiplied by the surface area which is pie r square that is the. area of this. hemispherical , base. which is pie r square. and on the two sircumferences in. inward direction surface tension will exert a force that is t into two pie r. and on both the surfaces it'll be t into two pie r and we can take the radius of. the two surfaces to be r as. the film thickness or.

Wall thickness of this bubble can be considered to be very small. so in this situation we can say. for, iquilibrium of. hemispherical. section. of the bubble. we can use. in this situation it is excess pressure multiplied by pie r square that is outward force must be balance by twice of. t into two pie r. in this situation pie and r gets cancelled out ,and. excess pressure can be written as. four t by r. this exactly double that of the excess pressure inside a liquid drop because here there are two , liquid surfaces where.

#### 1. Class 11th Lecture on Physics Surface Tension Surface Tension by Ashish Arora

Lets start with the topic of surface tension. and about surface tension we can write that. the property. of a liquid. due to which. its free surface. tries. to have. minimum surface area. and it behaves. if it is. under a tension. like a stretched membrane. is called. surface tension. here you needed to understand this property of a liquid very carefully as we are writing as it is property of liquid due to which. the free surface of liquid tries to have minimum surface area. like a rubber sheet if you stretch it and release it is.

Automatically have a tendency to reach a situation, it'll have a tendency to attain a situation when its tension become zero or it'll be under minimal tension , so that is a stage where we can say every liquid surface behaves like a stretched membrane, or it behaves as if it is under a tension. this property is called surface tension. and we can also write, it is due to. intermolicular forces. among liquid particles. here if we just , analyze the situation with the help of an example , here you can see, this is a, container in.

Which , a liquid is filled we can see as the container is transparent. if i talk about a particular , liquid particle p , we can see the particle will experience the force of attraction from all directions, due to the neighboring particles. and the spherical region in the surrounding of this particle up to which the force of attraction it can experience due to the neighboring particles, this spherical region is called sphere of influence. similarly on the surface of water if we talk about the sphere of influence as.

Only. one side on the particle liquid exist so the sphere of , influence of the particle will be hemispherical as we can see here in this situation. but if we talk about the top layer of the liquidsurface the particle which is present on a free surface of the liquid will be experiencing the attractive forces by its neighboring particle on the surface. and in its surrounding every particle will be attracting this. and here you can see every particle of this free surface of liquid will behave in the similar manner that.

#### 6. Physics Viscosity Poisueilles Equation by Ashish Arora

Let's study poi su li's equation , when we talk about poi su li's equation , this is basically concerned with the flow of a viscous fluid in the tube , like if we talk about, the flow of an ideal fluid in a tube of uniform cross section , we can say if the cross section is uniform the flow velocity, at the point where the fluid is entering must be equal to the flow velocity with which it will come out according to the continuity equation. and according to the Bernawlli's theorem if at this end the pressure is p1 and at other.

End it is p2, we can write as the tube is horizontal. and flow velocity is same in this situation p1 is equal to p2 this is for the situation. for an ideal fluid , but this is not the similar situation, when a viscous fluid flows , if we talk about a viscous fluid which is flowing through a pipe line, and in the tube if the flow velocity is v. here we can say , the radius of , tube is r then the discharge rate. of fluid can be.

Written as q , which is the product of cross section area, multiplied by velocity which is pie r square multiplied by v , this is the discharge rate at which the fluid will discharge throw the tube , in this situation if , this is end a and this is end b , and if pressure is pa and p b , in this situation we can say obviously as the fluid is flowing , the fluid layers will be experiencing friction in backward direction due to viscous force. so in this situation pa must be more than.

P b , without which the fluid won't flow as we need some force to overcome the viscous force , here we can say according to, poi su li equation , the discharge rate , of a viscous fluid, through a tube, can be given as, q is equal to pie r to power 4 by 8, ita, l. pa minus p b , that is the pressure difference , which is written as pie r to power 4 by, 8 ita l , and the pressure difference across the tube , just remember this expression.

We are not discussing the derivation of this equation which is derived experimentally in a situation, as well as qualitatively we can understand , but you just remember this equation , we have directly quoted this poi su li equation which is giving us the discharge rate of a fluid. across, through a tube across which the pressure difference is, delta p , and if the flow velocity is v then we can substitute q as pie r square v and we can find the flow velocity also. here ita is the viscous coefficient of the.

#### Understanding Blood Pressure Human Anatomy And Physiology Tutorial 3D Animation Elearnin

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#### The Doppler Effect Applied Physics Cardiology Echocardiography

The Doppler Effect Applied Physics Cardiology Echocardiography,by making use of the doppler effect in medicine, doctors can measure and display blood flow velocity and direction obstructions with great ease. heres a look..

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