# Month: March 2020

## Rocket Motion – Variable Mass Problem (Mechanical Physics)

Rocket Motion – Variable Mass Problem (Mechanical Physics Part 2)

• v is upward vertical rocket velocity related to Stationary Earth.
• vo is the initial rocket upward velocity of propellant Fuel relative to stationary earth. also initial exhaust velocity relative to stationary earth.
• D is downward atmospheric force, this is neglect this time for simplicity.
• T – Thrust force applying Newton’s 3rd Law.
• u – exhaust velocity relative to the rocket.
• Fext – Net external force expended in accelerating rocket and also variable mass propellant fuel.

## Defining Ideal Rocket

• There is no twisting or turning moment force acting on the rocket.
• The thrust T acts precisely at the rocket’s center of mass.
• The rocket and it’s propellent fuel mass solely involved in upward translational rectilinear motion.
• There is a realistic assumption of constant fuel burn rate implying constant thrust T.
• The gravity acceleration is assumed to be constant.

In the beginning part of the analysis, the rocket does not escape the earth’s gravity field.

## Generalized Equation (Rocket Motion – Variable Mass Problem)

This generalizes the rocket equation considers rocket weight by factoring out external gravity force of rocket and fuel weight from Fa but keeping drag D as part of Fa .

Rocket Motion – Variable Mass Problem (Mechanical Physics Part 2)

## Rocket Equation 2 (Rocket Motion – Variable Mass Problem)

This equation is really / corollary to the above equation.

• g is constant gravitational field acting upon rocket and propellant masses and also thrust force T.
• m – Total mass including propellant fuel.

[katex]T\quad =\quad \frac { ud(m) }{ dt }[/katex], thrust excreted by exhaust velocity of propellent.

g is constant gravitation field then,

Since it vaeies inversly thrue rocket length.

• vo – Initial rocket velocity.
• vbo – Burn out velocity, rocket velocity moment at complete.
• dv = vbo – vo, maximum burn out velocity.
• u = – ( v – vo ), effective exposed velocity.

Initial total rocket and propellant

## Rocket Equation 3 (Rocket Motion – Variable Mass Problem)

Also, this gives maximum rocket velocity at time t. Rocket Motion – Variable Mass Problem (Mechanical Physics Part 2)

## Rocket Equation 4 (Rocket Motion – Variable Mass Problem)

Propellent mass function,

Which is the fraction of initial mass that is reaction mass.

## Thrust to weight ratio

In other words the specific impulse can be defined as the ratio of the thrust produce to the rate at which the rocket consium its fuel.

## Question: (Rocket Motion – Variable Mass Problem (Mechanical Physics Part 2))

Consider a rocket moving in a space suppose that 2.1×106 kg of fuel a consiume during a burn last in 1.5×102 s. Give that there is a constant force on the rocket of 3.4×107 N. During this burn calculate the velocity of the exposting fuel. Hence calculate the increasing speed resulting some their burn. If the initial mass is 2.8×106 kg.

What is the initial vertical acceleration that can be important to this rocket when it is launched from the earth?

………….

## Rocket Motion – Variable Mass Problem (Mechanical Physics Part 2)

You can refer to “How to Build a Tesla Generator” from HERE, Also refer to the wiki.

## Introduction To Visual Basic Application Development

• “Visual” refers to the method used to create what the user sees (Graphical User interface).
• “Basic” refers to the BASIC (Beginners All-Purpose Symbolic Instruction Code) programming language.
• It is a high-level programming language that evolved from the earlier DOS version called BASIC.
• Visual Basic originally created to make it easier to write programs for the Windows computer operating system.
• One of the major reasons why Visual Basic has been so successful is that it includes everything that is necessary to write programs forWindows.
• For many years, Microsoft Visual Basic has been the world’s most popular programming language.
• From its very beginning, Visual Basic has brought unmatched flexibility and ease of programming to theWindows platform.
• In its previous six versions, Visual Basic evolved into an extremely powerful development tool that was equally at home in business, academia, engineering, or everywhere else in which windows applications were being created.
• The latest version of Visual Basic, called Visual basic .NET, is the most significant evolutionary change yet in the language. (Introduction To Visual Basic)

## General Features Of The Visual Basic

• GUI:- Graphical User Interface is there to represent the program objects and also the techniques.
• Modularization:- Good program practice to modularize program.
• Object-Oriented:- Creating objects while writing programs.
• Debugging:- Runtime debugger helps to find and also fix the bugs/ errors at runtime.
• Data Access aspect:- Users can able to create a database and also retrieve data at runtime.

## Introduction to Visual Studio Express 2012

• Visual Basic Express 2012 is almost similar to Visual Basic Express 2010 & 2008, but it has added many new features.
• Visual Basic Express 2012 no more comes as a stand-alone program, it is now integrating with other Microsoft Programming languages C# and also C++ in a package called visual Studio 2012.

(Introduction To Visual Basic Application Development)

## .NET Framework Architecture

• The .NET Framework is Microsoft’s new platform for the development and implementation of applications program.
• Simply, .NET is a new framework for developing web-based and also windows-based applications within the Microsoft environment.
• Microsoft and other publishers of development tools realized that they could write the code needed to perform a variety of commonly needed tasks and also make this functionality available to the programmer in an easy-to-use form.
• So, the framework did all the work behind the scenes, serving as an interface between the program and the operating system.
• Two main parts of the .NET framework are:
• Common Language Runtime.
• .NET framework classes/ libraries.

## Common Language Runtime (CLR)

CLR is considering as the heart of .NET. It also provides a “runtime environment” for the execution of code written in any .NET Language.

• Features :
• Common type system
• Intermediate Language (IL) to native code compilers
• Code execution and security
• Memory Management
• Garbage Handling
• Exception Handling
• Much of the functionality available to the VB .NET programmer is provided by the .NET Class Framework.
• This is a rich set of classes, interfaces, and also structures that provides support for data storage, access to system services, input/output, security and a whole host of other things that the programmer needs.
• The class framework is arranged hierarchically using the concept of namespaces.
• A namespace is nothing more than an identifier that is used to group related items together.
• The root namespace contains classes for all of the base data types (Integer, Char, Array and so on) as well as for the Object type that is the base for all .NET components.
• Applications that can make use of .net class library:
• Windows applications
• Console applications
• Web applications
• XML web applications/services
• Windows services

## Elements of a Visual Basic Application

From a programming viewpoint, Visual Basic is an object-oriented that consists of two fundamental parts.

## A visual part and a language part

• The visual part of the language consists of a set of objects, while the language part consists of a high-level procedural programming language.
• These two elements of the language are using together to create applications.
• Thus, for our purposes, we can express the elements of a visual basic application as:

(Introduction To Visual Basic Application Development)

## The Visual Element

• From a user’s standpoint, the visual part of an application is provided within a window. This is the graphical interface that allows the user to see the input and also output provided by the application.
• This user interfaces referred to as the graphical user interface (GUI).
• From a programmer’s perspective, the GUI is constructed by placing a set of visual objects on a blank window, or form, when the program is being developed.
• The programmer can place various objects on this form, which is itself a Visual Basic object.
• When an application is run, the form becomes a window that provides the background for the various objects placed on the form by the programmer.
• The standard object Tool-box contains the objects we will use in constructing each graphical user interface.

## Creating a Visual Basic program

• To create a Visual basic program you will need the following three windows:
• Toolbox window for selecting objects
• Form window for placing objects
• The properties window for altering an object’s properties

Additionally, the Solution Explorer window should be visible when you begin.

• Once the design windows are visible, creating a Visual Basic application requires the following three steps:
• Create the graphical user interface
• Set the properties of each object on the interface
• Write the code

## Setting an Object’s Properties

• All objects on a form have properties, which define where on the form the object will appear. The color of the object, its size, and also various other attributes.
• The properties window allows properties to be listed in alphabetic order, by property name or by property category, By default, also the properties are sorted by category.
• The two columns within the properties window are where individual object properties are identified.
• The column on the left is the properties list, which provides the names of the properties of the object also named in the object box.
• The column to the right is the settings list, which provides the current value assigned to the property also on the left.
• The currently selected property is the one that is highlighted.

(Introduction To Visual Basic Application Development)

## Basic Concepts in Introduction To Visual Basic Application Development

The Name Property:

• The names that are allowed for all objects are also used to name other elements in the Visual Basic programming language and are collectively referred to as identifiers. Identifiers can be made up of any combination of letters, digits or underscores( _ ) selected according to the following rules:
1. The first character of an identifier must be a letter.
2. Only letters, digits or underscores may follow the initial letter (Blank spaces, special characters, and also punctuation marks are not allowed)
3. An identifier can be no longer than 1016 characters
4. An identifier cannot be a keyword.

Running an Application:

• At any time during program development, you can run your program using one of the following three methods:
1. Select the Debug Menu and Click Start
2. Press the F5 function key
3. Use the hotkey Alt + D, then press the S key.

Saving a Project:

• Click the File menu and then click Save All.
• At this point, all the forms, code modules, and ancillary files will be saved in a folder. Also, the name of the folder will be the project name.

## OR

• Click ” SaveAll ” icon in the Standard Toolbar.
• Also, It recommends you save your solution to prevent accidental loss of work.

• In a well-designed program, each procedure will consist of a set of instructions necessary to complete and also a well-defined task.
• Although a procedure that is executed when an event occurs is referred to as an event procedure or event handler.
• The following slide illustrated The general structure of an event procedure:

Write two simple event procedures for action while a form loading in the execution of VB .NET

Example 1:

Example 2:

• The first line of a procedure is always and also a header line.
• A header line begins with the optional keyword Private and must contain the keyword Sub (which derives from the word Subprogram), the name of the procedure and also a set of parentheses.
• For event procedures, the name consists of
• an object identification,
• an optional underscore character ( _ ),
• a valid event for the object,
• the parameters in parentheses,
• the keyword Handles followed by the object identification,
• an underscore character &
• a valid event.
• Event procedure templates need not be manually typed because they are automatically provided in the visual Basic Code window.
• Before activating the code window, we need to decide what Visual Basic statements will be included in the body of our event procedure. (Introduction To Visual Basic Application Development)

## Find some additional features of VB .NET compared to VB

For the Visual Application Development (Theory) lesson, click here. also, you can refer more in here.

## Learning Objectives in Visual Application Development

• To provide an introduction to the fundamentals of programming.
• Enable students to build simple and also graphical applications to address the problems they face in academic and business settings.
• Enhance analysis, design, development, troubleshooting, and critical thinking skills.

(Visual Application Development)

## Software Processes

• When we provide a service or create a product we always follow a sequence of steps to accomplish a set of tasks.
• We can think of a series of structured activities as a process.
• Any process that has the following characteristics,
• prescribes all of the major activities.
• uses resources and produces intermediate and final products.
• organized to include sub-processes & activities in a sequence.
• Constrains or control may apply to activities (Budget control and also the availability of resources).
• When the process involves the building of some product we refer to the process as a life cycle. (Visual Application Development)

## Introduction to SDLC

• The Software Development Life Cycle is the process, involving multiple stages also used to convert a management need into an application system, which is custom developed or purchased, or is a combination of both. (Visual Application Development)
• SDLC is . . .
• A model of a detailed plan on how to create, develop, implement and also deliver software.
• A complete plan outlining how the software will be born and also raised and turned over to its eventual user.

## Basic Pattern of General Life Cycle Models

Each phase produces output (deliverables) that will be the input to the next phase. So, a software process model is an abstract representation of a process. (Visual Application Development)

## Sequential Development

• A development strategy wherein a strict set of development phases or stages followed in sequential or linear order.
• Only when one phase or stage is completed can development move on to the succeeding phase or stage.
• Also Sometimes referred to as a classical or traditional method of software development.

(Visual Application Development)

## Iterative Development

• Iterative development is a strategy for scheduling a certain amount of time for rework or revisions in order to improve the quality of the different parts of the system being built.
• Instead, development begins by specifying and implementing just part of the software, which can review in order to identify further requirements.

(Visual Application Development)

## SDLC Models

• Waterfall Model
• Spiral Model
• Rapid Application Development
• V Model
• Agile Model

## Waterfall Model

• Executed the Phases in sequential order
• Completed Each phase before proceeding to the next.
• Customer Can’t see Software until the end of the project.
• It provides a structured approach.

## Advantages of the Waterfall Model

• Relatively simple to understand.
• Give importance to documentation.
• Each phase of development proceeds sequentially.
• Allows managerial control where a schedule with deadlines is set for each stage of development.
• Helps in controlling schedules, budgets, and also documentation.
• It provides a structured approach.
• Generally suited for stable projects.

• Requirements need to be specified before the development proceeds.
• Can’t make the changes in requirements in later phases of the waterfall model. This implies that once the software enters the testing phase, it becomes difficult to incorporate changes at such a late phase.
• No user involvement and working version of the software is available when the software is being developed.
• It does not involve risk management.
• Assumes that requirements are stable and are frozen across the project span.

(Visual Application Development)

## Spiral Model

• The iterative model with an emphasis on risk analysis.
• Aims to combine advantages of top-down and also bottom-up concepts.
• Good for large and also mission-critical projects.
• But success highly depends on risk analysis and can be costly.

## Phases of the Spiral Model

1. : Determine objectives and also constraints.
2. : Assessed the risks and also the activities put in place to reduce the key risks.
3. : Also Chose the development model for the system.
4. : Reviewed the Project and also planned the next phase of the spiral.

• With conventional methods,
• There is a long delay before the customer gets to see any results.
• Development can take so long that the customer’s business has fundamentally changed by the time the system is ready for use.
• It is obvious that there is nothing until 100% of the process is finished.

(Visual Application Development)

“A software development process that allows usable systems to be built in as little as 60-90 days and also often with some compromises”

“A software development methodology that uses minimal planning in favor of rapid prototyping.”

(Visual Application Development)

## Visual Application Development

For the Visual Application Development (practical) lesson, click here. also, you can refer more theory in here.

## What Would Happen To You If You Were Infected With COVID-19?

COVID-19 has infected thousands, and could potentially affect millions of people, all around the world. The coronavirus or COVID-19 originated in wild animals. The reason why it’s been able to spread so easily is that it’s an airborne virus. If someone infected coughs or sneezes near you, then you have a chance of catching the disease. Researchers also suspect that the coronavirus can live on surfaces. So if you happen to touch a contaminated surface, and then touch your mouth, you’re probably going to get infected yourself.

## What happens if you do catch the coronavirus (COVID-19)?

Well, there’s a good chance that you wouldn’t feel anything, at least not immediately. It could take two days or up to two weeks before you notice any symptoms. This means you’d be living life the way you normally would, but you’d unknowingly be infecting everyone around you.

• What would happen if you actually started experiencing these symptoms?

Well, it’d be a bit different for everyone. Your body temperature would first increase as it attempts to fight off the coronavirus (COVID-19). This means you have a fever, causing you to shiver and sweat. These symptoms might last for a couple of days.

## What can you do?

At this point, you should stay home. and stay away from other people. Let’s hope you have some food stocked up. Although being sick sucks, you could use this time to catch up on all your Netflix shows. Maybe even some Phobia.tech articles 🙂 (coronavirus COVID-19)

And when you weren’t doing that, you’d probably be sleeping, as your body would be working as hard as it could, trying to heal. You might think you’re in the clear at this point,

## What if the situation going worse?

But this is when pneumonia could set in. If it did, you’d find it difficult to breathe, and you’d have more mucus in your lungs and nostrils which would lead to more coughing. The shortness of breath and chest pain would continue to get worse. There’s also a chance you’d vomiting. And on top of all this, you’d feel incredibly weak and tired. Your lungs would also continue to worsen. Some patients with the coronavirus have ever experienced. permanent lung damage and scarring. But there’s also much more about the coronavirus (COVID-19) that we don’t know yet. Other organs could be affected, as well. Some patients have shown signs of liver problems. So if you are experiencing any of these signs, you might want to go to the hospital.

## How about in the hospital?

At this point, you’ll be put into a quarantined area so you wouldn’t infect anyone else. Unfortunately, doctors can’t guarantee they can cure you. And a vaccine for the coronavirus might not be available for another year at least. But they’d do their best to help you feel better by giving you painkillers, and lots of fluids. As time went on, your body might be able to naturally heal itself from the coronavirus (COVID-19).

But that’s only if you were a healthy person, to begin with. If you weren’t, then the coronavirus (COVID-19) could cause organ failure and then death. It’s been reported that patients with major health issues like cancer and diabetes have a higher chance of dying from the coronavirus. So if you do happen to catch the coronavirus, it doesn’t mean immediate death, but what you do need to watch out for is infecting other people. This includes the elderly and people with previous health problems. But most people will get sick and survive without any serious damage.

## How could you prevent something like this in the first place?

Wash your hands! It might seem obvious but it works and is the best way to kill the coronavirus (COVID-19). And if you can’t find a sink, then you can use hand sanitizer but it’ll have to have a high alcohol percentage. And also, try your best to be conscious of how you spread your germs, as well as where germs might be. Like, stop touching your face after you get off public transit. Please?

Now, hopefully, you avoid getting the coronavirus (COVID-19), but what would happen if everyone else on Earth caught if? And a global pandemic occurred? Well, we’ll leave that story for another article on phobia.tech or wiki.

## Sony Xperia 5 is fit to pocket and more about Xperia 5

No combat, Sony company had entered the key race of the smartphone market. Their trump is Sony Xperia series. By comparing other companies in the smartphone market, Sony’s statistics are different from others. So, Sony Xperia 5 is also one of the results of their statistics for the targeted niche. Here’s their bit small smartphone which they think, will pit to pocket.

## Let’s unbox

When designing the box, Sony company had not tried to show it is a small phone than their other phones. So, big is too bigger than the phone size. Phone size is 158 X 68 X 8.2 mm. it is only 164 grams in weight. It is 14 g loss of weight and 4mm thinner than Xperia 1. There are 18 W power delivery USB-C charger, USB-C to USB-C cable, USB-C to 3.55 mm adapter and 3.5mm earphones including the phone inside the box.

## Display and design

It is a 6.1 inches OLED display covered with Gorilla Glass 6. This OLED display has a 21:9 Cinema Wide aspect ratio. But they had dropped down the display quality from Sony Xperia 1’s 4K HDR to 1080p quality for Xperia 5. However, by considering the display size of the Xperia 5, 1080p quality will not affect the displays shine. This is Sony’s small version of Xperia. But actually, it is a tiny bit taller than Galaxy S10 Plus.

## Performance and battery

Sony Xperia 5 is powered by Android 9 pie. There is a Qualcomm Snapdragon 855 chipset with 6GB RAM capacity. There is a 128 Gb inbuild internal memory. This memory is common for all nowadays flagship smartphones. However, you can add an external micro SD card up to 1 TB. Sony Xperia 5’s battery is a 3,140 mAh Lithium-ion battery. It is less powerful than the Xperia 1. It available Xperia adaptive charging, stamina, and Ultra stamina mode as well. However, Sony had not added wireless charging facilities. It is a big defect of Sony phones by comparing it with other flagship mobile manufacturers.

## Camera quality

Sony Xperia 5 is also a triple camera phone with 12 MP triple cameras. One camera is with a wide-angle lens, another with a telephoto lens and its third camera is with a Super-wide lens. Its selfie camera is an 8 MP camera. However, the triple camera setup is not magic for flagship mobiles and mid-range mobiles as well. Because some companies like Samsung, Huawei had launched quad-camera setups as well. Besides, they had forgotten AI camera mode, panorama mode, slow-motion video caption, and most of the other creative settings for photos and video recordings. Sony Xperia 5’s night mode is also not in an applicable quality. But it will support to get the best results in selfies and 4K videos with its best strength.

## Price and availability

It priced between US$699 to US$ 799 in leading online stores. It is US$50 to US$ 150 cheaper than Sony Xperia 1. However, this is not a cheap price by comparing other flagship models. This is not the best price for all features packed inside the Sony Xperia 5. However, if you are a Sony lover who seeking a smaller version of Xperia 1, this is yours.

you can get more about Sony Xperia 5 and also you can see more here.

## Sony Xperia 1 Specialties and the review

Sony was not in the race of manufacturing smartphones for a long time. But now they had entered the track against Samsung, Huawei and other companies who were in the race. So, what is the specialty of Sony’s new smartphones to enter the key race? Let’s going to get to know all about Sony’s Xperia 1 and its key features.

## Sony Xperia 1 – Let’s unbox it

The main specialty of Sony Xperia 1 is its size. It is a super slim and super tall smartphone with 167 X 72 X 8.2 mm body size. But it is only 178 g in weight. The display is covered with Gorilla Glass 6. All ports and sub equipment which have to connect to the Smartphone comes with USB type C. They provide, 18W USB-c charger, USB-C to USB-C cable, USB-C to 3.5mm adapter and USB-C headphones inside the box.

## Sony Xperia 1 – Display and design

Sony Xperia 1’s display size is 6.5 inches. It is a large and 4K HDR OLED display. But it is not a fit to frame display. However, it has a 21:9 Cinema Wide aspect ratio. It is good for getting a cinematic experience while watching any video. The display’s brightness is perfect. However, it is not all about you might ask of a phone. There is no notch, no punched hole, or edge to edge display. You can see the traditional look of smartphones with top and bottom lines aside from the display. There are only two colors for the phone as black and purple. You can choose the favorite color from those two colors.

## Sony Xperia 1 – Performance and battery

Sony Xperia is powered by the Android 9 pie version. It is a Qualcomm Snapdragon 855 S0C processor which has 2.8 GHz octa-core, 7 nm processing power. Sony Xperia 1 has a 128GB inbuilt storage with 6GB RAM. This storage and power are well sufficient for best performances. There is a 3,330 mAh Lithium-ion battery. It is a bit small for a flagship mobile. And they not providing wireless charging as well. It is not good news about Sony Xperia 1 as a flagship mobile phone. And its battery life is limited to 12 hours to 14 hours with general usages such as video streaming and web browsing. But there is a fast-charging option for Xperia as, Sony’s Stamina mode.

## camera quality

You can see triple cameras in the top center of the backside of the phone and one selfie camera the top line of the front. All rear cameras are 12 MP cameras. But their task is differing one to another. One camera is with a wide-angle lens, another with a telephoto lens and the rest is with the super-wide lens. The front camera is an 8 MP camera. Video quality is 4K HDR. Beyond this, the camera setup supports supper slow motion, AR effect, panorama, and other creative effects as well. So, the camera setup is similar to other flagship models. But there is no time-laps mode available.

## Price and availability

It had priced between US$849 to US$ 949. Sony Xperia 1 is available in all leading online stores. However, this is not a cheap price for features packed inside the Xperia. However, if you are a totally Sony fan, it doesn’t matter.

you can get more about Sony Xperia 1 and also you can see more here.

## Motorola Razr Latest Smart Flip Phone

The mobile phone was invented as a result of various advances in technology. Modern mobile phones are a collection of facilities. Motorola Razr is a new introduction of Motorola’s mobility. It is a foldable Android Smartphone. The unveiling ceremony of this Superb mobile phone was held in November this year, but still, it hasn’t been released to the market. According to the latest news, it will be released in 2020. The most special feature of this upcoming foldable mobile phone is that unlike the other foldable mobile phones which have to be folded vertically, Motorola Razr has to be Folded horizontally. Apart from that, it has many more attractive features.

## Motorola Razr Comfortability

It fits the user’s palm and Pocket when being shut and the shape makes it look very elegant. “razr” is a sleek modern Smartphone, unlike any other mobile phone people, have seen so far in their lives. we can close razr both sides perfectly Flushed as it has the zero-gap hinge. It also has a tacky design that provides ultimate protection to the main display.

## Motorola Razr is Easy to handle

It has a touch-enabled quick view display. By this you will be able to play music, capture Selfies, get notifications even without opening up your phone.

## Motorola Razr has Duel Screens

These two screens display the same thing at the same time. you will be able to see everything you see on the quick view display on the larger view display when you flip it open. It will also show you the battery level, as well as the time.

## Cinematic viewing

razr has a stunning Flexible display featuring cinema vision. It gives you the same ultra-wide dimensions in the film industry. when your mobile screen is being rotated and a movie is played.

It is not actually unwieldy or over long. The screen is of course about six point two inches in height, yet with its 21:9 ratio, the Screen can be also called narrow. The resolution of Motorola “razr” is actually two thousand one hundred and forty-two in height hundred and Seventy Six megapixels. The user can see, touch and reach! its apps in a second very easily with his thumb as Motorola LLC has bottom-loaded most of its apps as well as other essential controls.

## Is it sturdy to open and close?

It is one of the most easily unfordable and closable mobile phones with a single hand. It does not make your fingers tired or aching. However, the first few days might be tiring your fingers. But after getting used, it is really easy. You can feel the tension of its hinge when you keep opening and closing it.

## Can you see a crease?

A very narrow crease can be seen where the hinge is located. But it is not visible unless you look at it earnestly. Sometimes you will have to rub it to feel that a crease really exists.

## Other

Apart from the above information, the below information will also be important for its buyers to know. Motorola razor’s operating system Is Android TM g pie and it has a memory of 6 GB. Its main processor is Qualcomm Snapdragon 710, octa-core, 2.2 GHz. It has an internal storage capacity of one hundred and twenty-eight GBs.

## Photo-storage

Motorola razor gives you unlimited free photo storage. It backs up all your memories.

## Water repellency

This mobile phone is designed in a way that resists spills, splashes or even little drops of sweat get inside. So you can make a call even in the rain without hesitation as it has a superbly enhanced water repellency.

you can get more about Motorola Razr and also you can see more here.

## What is Black Friday Shopping Season?

Black Friday Shopping Season is a special day for Americans. But not only the Americans, most of the people in every country know what Black Friday really is. If you were not aware of this special day of the united states this article will be surely an amazing and valuable one for you

## History of Black Friday Shopping Season

Every year America’s traditional annual Thanksgiving is held on the last Thursday of November. The former and the popular US President Abraham Lincoln is the person deserves the honor of designating the last Thursday of November as the thanksgiving day. So there is a hidden story behind the black Friday. People who got a holiday because of the Thanksgiving day wanted to get 4 holidays with the weekend days Sunday and Saturday. Therefore, most of them requested sick leaves on a Friday which was next to the Thanksgiving Thursday of the united states of America.

Their motive was to get 4 free days on a row. So all the legitimate and illegitimate sick applicants started their weekend shopping on Black Friday.

So the Philadelphian police named the day followed by the thanksgiving Thursday as it created an unbearable noise of the massive crowd which was all over the cities to buy goods. This heavy volume created road accidents.

## History of the term

It is said that sometimes it also caused violence. So the police coined this phrase to describe the huge congestion that occurred as a result of a massive crowd in a town. This term was first reported in 1960 in public relations news in America. A stamp seller who sells rare stamps used the term “Black Friday” for the first time in 1960. Mr. Earl Apfelbaum.He has said that Black Friday is the day that comes after the Thanksgiving Thursday and Philadelphian police designated it as the Black Friday. He further stressed that black Friday is not a term of any endearment for them.

## Commencement of sales

Black Friday officially opens the Christmas shopping season for the people in the center city. It usually brings a massive crowd which makes a massive traffic jam as well as overcrowded sidewalks. On Black Fridays, most of the sellers start their businesses very early. For instance, some sellers start their businesses at midnight and sometimes even on the day of thanksgiving. Most of these sellers offer very high offers on the day for their customers.

## Violence and injuries of the Black Friday Shopping Season

Sometimes violence is very seriously occurring between shoppers on Black Fridays. Since 2006 twelve deaths and 117 injuries reported in the United States of America on Black Friday. These conflicts are very common and unavoidable because people use to camp out on the day of Thanksgiving Thursday and to secure their place in long queues to easily buy their desired items. As a result of this minor injuries and incidents are taking place very often. Those incidents are like pushing or throwing others to the ground.

## Darkest day

The most pathetic incident of black Friday shopping occurred in 2008 in New York valley – stream. Nearly 2000 people were waiting in front of a shop and when the door opened everyone broke into the shop at once. A – 34-year-old shopper trampled to death when they broke into the shop anxiously.

you can get more about Black Friday Shopping Season and also you can see more here.