Conservation of Angular Momentum | Conservation of Angular Momentum Experiment | Angular Momentum

Here you will understand the principle of Conservation of Angular Momentum. For explaining the conservation of angular momentum I have taken help of two experiments. According to the Law of Conservation of Angular Momentum under ideal conditions, the angular momentum of a rotating object remains constant. 
Principle of Conservation of Angular Momentum is given as the product of moment of inertia (I) and the angular speed (w).

Angular momentum conservation formula -
Moment of Inertia (I) x Angular Speed (w) = Constant

Here is the first experiment to demonstrate the principle of conservation of angular momentum.
First climb on this Central circular platform and hold the handle. Now push the leg against the fixed outer platform to give yourself a spin.

Conservation of Angular Momentum Video

 

Now observe carefully that, when you lean towards the handle the spin speed increases and on leaning outwards the spin speed decreases. Now repeat the same experiment several times and observe how the speed of rotation changes.
Now before explaining the science behind it let me show you one more experiments based on principle of conservation of angular momentum.
First sit on the chair and push the weights away at your full arm lengths and hold them.
Now take help of your friend and ask him or her to give you a turn gently.
Now observe that your speed of rotation increases as you bring both the weights close to you while rotating. And when you push away the weights the rotation speed decreases.
So these are the two experiments that explain the principle of conservation of angular momentum.
Now we will understand the Science that explains it.
According to the principle of conservation of angular momentum, the angular momentum of a rotating object remains constant under ideal conditions.
Angular momentum is given as the product of moment of inertia (I) and the angular speed (w).

Its given by the formula-
Iw = Constant

Moment of inertia is the product of the mass and square of its perpendicular distance from the axis of rotation.
So when the distance of the body decreases from the axis of rotation, its moment of inertia decreases but according to the principle of conservation of angular momentum, the product of moment of inertia and the angular speed must be constant. So to compensate for this decrease in moment of inertia, the angular speed of the body increases.
Just opposite of this happens when we move away from the axis of rotation. In this case the moment of inertia increases as the distance of the body increases from the axis of rotation. So to keep the product of moment of inertia and angular speed constant, according to the conservation of angular momentum, the speed of rotation decreases.
This same thing happens in the second experiment as the weights i.e. mass is pushed away from the axis of rotation, its moment of inertia increases so the angular speed is decreased and you spin slower. And opposite of it happens when the weights are pulled towards your body I.e. closer to the axis of rotation.
So friends, I hope now you understand the concept of principle of angular momentum conservation.

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Why Doctors Wear White Coat and Lawyers Wear Black Coat

You might have noticed that Doctors wear White Coat while Lawyers wear Black coat. First of all we will know why do doctors wear white coat. Actually white color is the symbol of health and hygiene. As we know that whenever there is a stain on the white clothes, it is easily visible. So when the white coat is dirty, doctors can easily feel the need to change or wash it. This frequent changing of cloths by doctors ensures that a clean, healthy and sterile environment in maintained in the hospital all the time. This is the reason why doctors wear white coat instead of other colored coats.
Now we will know why do lawyers wear black coat ? Wearing of black coats by lawyers and judges is part of the British tradition of the 17th century. Black color is considered as the symbol of honor, wisdom, dignity and justice. So black colored coat is prescribed for judges and lawyers, as they need to maintain all these values required by their profession.

Why Doctors Wear White Coat and Lawyers Wear Black Coat Video

 

Friends now you know why people of different professions wear clothes of a particular color. A specific color is either required by a profession or tells something about that profession.
So friends, this is the reason why doctors wear white colored coat whereas lawyers wear black.


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X-CTU is a tool that configures ZigBee modules with whatever settings required. First step is to install X-CTU software. After this, ZigBee modules configuration begins. A point-to-point network is required to be constructed, which means that the two devices will communicate with each other. For this purpose, one ZigBee should be configured as a Coordinator (or Master), because it is mandatory to have one coordinator in each network and the other should be configured as a Router (or end device). So a Coordinator is created that will manage the network of ZigBee, here a network consists of one more ZigBee module. To begin, we need to take our ZigBee module (xbee radio) and insert it onto the XBee Explorer device and connect it to computer through RS232 serial port.

Further steps to Configure Zigbee module using XCTU are given below:

Steps to Configure ZigBee (XBee) Module using XCTU Software

After connecting the ZigBee with the computer, double click the X-CTU icon and a window will open. This window looks like as shown in the figure 1.

Figure 1: Window for discovering radio module devices (Configure ZigBee/XBee using XCTU)

Now click on the discover devices to discover the radio device. On clicking on this icon a window appears as depicted in the figure 2. On selecting the port to be scanned, click on next button. 

Figure 2: Window for selecting the ports to scan (Configure ZigBee/XBee using XCTU)

Figure 3: Setting the port parameters (Configure ZigBee/XBee using XCTU)

As we click on the next button a window appears allowing to set port parameters. These port parameters include baud rate, data bits, parity, stop bits and flow control. These parameters have been shown in the figure 3. After setting all these parameters, click on the finish button. Now as shown in the figure 4, click on the ‘add selected device’ button.

Figure 4: Window showing the discovered device (Configure ZigBee/XBee using XCTU)

Now the radio module gets added. At this stage the radio module can be configured. To configure it, click on the icon of the radio module to show its properties and to configure it.

Now the properties will be visible as depicted in the figure 5. After this, click on the update firmware icon. On clicking on the icon a window appears as shown in the figure 6. In this window select Zigbee Coordinator AT from the function set and 20A7 (Newest) from the Firmware version. Now click on the update button. On updating, it is time to configure the radio module.

Figure 5: Radio device configuration window (Configure ZigBee/XBee using XCTU)

To make the radio modules (zigbee devices) to communicate with each other it is essential to edit the addressing settings appropriately. So as clear from the figure 7, in the destination address high (DH) and destination address low (DL) write the serial number high (SH) and serial number low (SL) of the radio module, to be configured as the router. Write ‘coordinator’ in the Node Identifier (NI) to identify the device as the coordinator. After finishing all this, click on the ‘write radio settings’ icon.

Figure 6: Updating the radio firmware for the COORDINATOR (Configure ZigBee/XBee using XCTU)

Figure 7: Configuring the address of the COORDINATOR (Configure ZigBee/XBee using XCTU)

The radio module ( zigbee module) can now be removed from the XBee Explorer . Now insert  the other zigbee module into the XBee Explorer to configure it as the ROUTER. Discover device and add the device in the same way, as was done for the coordinator device and click on the update Firmware. The update Firmware window is shown in the figure 8. Now select the Zigbee Router AT from the function set and 22A7 (Newest) from the Firmware version and click on update button.
After successful firmware updation, edit the addressing settings as depicted in the figure 9. In the Destination address High (DH) and Destination address Low (DL) write the Serial number High (SH) and Serial number Low (SL) of the radio module, configured as the COORDINATOR. Write ‘ROUTER’ in the Node Identifier (NI) to identify the device as the router and click on the ‘write radio settings’ icon.

Figure 8: Updating the firmware of the ROUTER (Configure ZigBee/XBee using XCTU)

Figure 9: Configuring the address of the ROUTER (Configure ZigBee/XBee using XCTU)

Why the Colour of School Bus is Yellow

Here you will know, Why the Color of School Bus is Yellow. Friends, you might have noticed that the color of school buses is always yellow. But why all school buses have yellow color? Actually there is a scientific reason behind it and from the safety point of view, school buses are painted in yellow color.
Friends, Do you know that our eyes are most sensitive to yellow color in comparison to other colors. That is the reason, why we observe yellow color more quickly. This has also been proved in a research done in United states in 1930.
Many of you may think that the color of school buses should be red instead of yellow. Their logic behind this would be that the color of sign of danger is red, which is visible from a large distance.

Why the Colour of School Bus is Yellow Video

 

But I would like to tell them that although it is true that the danger sign is red colored as the wavelength of red color is largest when compared to other colors. Because of it the red colored light does not scatter easily and is clearly visible from a large distance.
But you should know that yellow color has 1.24 times more attraction for us than any other color. Our eyes are most sensitive to yellow color. This is the reason that yellow color can be detected by our eyes more quickly than other colors.
So even if a person is not looking straight, while driving or walking on the road, he or she can easily notice the yellow colored school bus.
Our eyes have the highest sensitivity to yellow color, so not only can we easily see the yellow school bus coming from large distance but also, due to the yellow color, it is easily visible to us at night or during bad weather conditions such as rain or fog. Hence we are saved from an accident.
So friends, now you know why all school buses are painted in yellow color.


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Why all Planets and Stars are Round in Shape | Why all Planets are Sphere in Shape

Here we will know why all planets and stars are round in shape. Friends, as you know, large objects like planets and stars are round in shape, but small objects like mountains, asteroids, trees, rocks, houses etc. are of different shapes. Do you know what is the reason behind this?
What is the force that forces large objects to be spherical.
So friends Gravity is the force that compels huge objects like planets and stars to take spherical shape.
Now you may ask, if this force is so powerful, then why is it not effective on small objects and why does it bring large objects only in spherical form instead of other shapes. So let's understand this-
Here the fact is, more massive objects have stronger gravity.

Why all Planets and Stars are Round in Shape Video

 

Because of Huge mass planets and stars have very strong gravity. This strong Gravitational force pulls it towards its center equally from all sides. This forces it to take round shape.
But How it works, let's understand it with the help of a simple example.
Suppose there is a tall building on our planet Earth but its foundation is not strong enough to hold its weight. So the building will collapse. The gravity of planet earth will pull the building down towards its center. So in this way you can understand how gravity of massive objects like planets and stars pulls everything towards its center to transform itself into a round shape. If there is any irregularity in the shape, the strong gravitational force acting uniformly towards the center of the planet will try to squeeze it into a spherical shape.
But in case of objects like mountains, asteroids, humans, buildings etc. that are not very massive, the gravity is not strong enough to squeeze it into the spherical shape. So they retain their original shape.
So now you know why all massive objects are spherical in shape.

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