What is Buoyancy?

This video explains the concept of Buoyancy.

From: https://www.youtube.com/watch?v=khc2wUBsFU4

What is Buoyancy?

Buoyancy is an upward force exerted by a fluid on an immersed object in a gravity field.

In fluids, pressure increases with depth; hence, when an object is immersed in a fluid, the pressure exerted on its bottom surface is higher than the pressure exerted on its top surface.

This difference in the pressure leads to a net upward force (buoyancy force) which opposes the gravity force and is equivalent to the weight of the fluid that would otherwise occupy the volume of the object, i.e. the displaced fluid.

Thus, if the object is less dense than the fluid, the buoyancy force will be higher than its weight and the object will float; on the contrary, if the object is denser than the fluid, it will sink.

The static balance occurs when the weight of the immersed part of the object is the same as the weight of the displaced fluid, i.e. the densities coincide.

Remark that the density of the object is meant in an averaged way, as a simple ratio between mass and volume of the immersed part.

The most common case is the immersion of a solid into a liquid (e.g. ships in the sea), but that’s not all: a rising bubble (gas in liquid), a falling droplet (liquid in gas) and aerostats (warm air into cold air) are examples of phenomena ruled by buoyancy forces as well.

Surface Tension - Why are drops spherical?

Topic: Surface Tension

Why are drops spherical?

Because personally, I am fond of spherical shapes as compared to squares.

No.

It is because of surface tension.

Surface tension is the property of liquids by which surface molecules of a liquid try to hold the liquid together by acquiring minimum surface area and acting like a stretched membrane.

You know what, everything just went over my head.

Alright. I will explain.

Inside a drop, each water molecule is pulled with a force by its neighboring molecules.

As these forces are equal and opposite, they get neutralized.

However, the molecule present at the surface is not attracted outwards.

It is attracted only inwards and sideways.

Sideways forces get neutralized.

But because of the inward force, each surface molecule contracts to form a shape that has minimum surface area which is a sphere.

From: https://www.youtube.com/watch?v=4WZTzKu3CsY

Fibonacci Sequence in Nature

Fibonacci Sequence

Individuality -- the trademark of any artist, designer, or architect, each desires a uniqueness to their creation, a quality that separates it from any other.  Man naturally has this individuality.–his fingerprint. There are 6.5 billion people on the face of the earth and no two fingerprints are the same.  Everything we touch or make contact with is branded with a small expressed image revealing to all who see it - Who was there! 

Around 1200 AD  a man named Leonard Pisano, better known as Fibonacci, discovered a sequence of numbers that created a very interesting pattern.  The sequence begins with the numbers 1, 1, 2, 3, 5, 8, 13, 21, 34, and continues indefinitely.  Each number is obtained by adding the last two digits together.  A rectangle with the length and width of any two of the numbers of this sequence forms what is known as the golden rectangle, a perfect rectangle.  A golden rectangle can be broken down into squares the size of the next F numbers down and below.  If we were to take a golden or perfect rectangle, break it down into smaller squares based on Fibonacci’s sequence, and divide each with an arc, the patterns begins to take shape.   We begin to see Fibonacci’s spiral…the spiral in and of itself is insignificant; its importance is revealed in where we find it.

Take for example the sunflower the display of its florets are in perfect spirals of 55, 34 and 21 -  sequence of  Fibonacci; the fruitlets of the pineapple creates the same sequence;  the pine cone does the same.  As currents move through the ocean and the tide rolls onto the shore,   the waves that bring in the tide, curve into a spiral that can be mathematically diagrammed onto a plot:  1, 1, 2,3,5,8,13,21,34 and 55.

Buds on trees, sand dollars, starfish, petals on flowers and especially the nautilus shell are formed with this exact same blueprint.  With each segment of growth, the nautilus adds to itself one more value on Fibonacci’s scale.  This blue print can be seen around us on a small scale every day.  But the greatest example of all is directly above our heads.  At an average of 100, 000 light years across, even the spiral of the galaxies above us are formed with the exact design that the tiny shell is formed. This sequence, our blueprint, appears to be the trademark of a Designer, a proof of a Creator, something left behind Indicating the One who is there – a fingerprint.   As we span our universe from the tiny flower to the awe inspiring galaxies, we see the fingerprint of God.  And we are forced to ask:  “Who is God?”

Royal Canadian Mint Gold Processing and Minting

Gold Coin Making

This was from the Discovery Channel show On The Inside.  This segment shows the RCM refining gold, rolling it, and making one ounce coins.

The Royal Canadian Mint is a Crown corporation, operating under the Royal Canadian Mint Act. The shares of the Mint are held in trust for the Crown in right of Canada.

The Mint produces all of Canada's circulation coins, and manufactures circulation coins on behalf of other nations. The Mint also designs and manufactures precious and base metal collector coins; gold, silver, palladium, and platinum bullion coins; medals, as well as medallions and tokens. It further offers gold and silver refinery and assay services.

How to Create and Join Yahoo Groups

Yahoo! Groups is where people with a shared interest meet, get to know each other, and stay informed. Group member's accesses shared message archives, photos and photo albums, group events and more. It's free to join.

Step 1

Go to groups.yahoo.com on your browser

In order to join yahoo groups go to groups.yahoo.com

Step 2

To join a group, click on the existing links on the page

On the yahoo group's page, you will see a list of groups that already exist. On top right of the page, there is a link to start your group. To join a yahoo group that already exists, click on one of the existing links on the page.

Step 3

Browse on specialized groups

Browse for more specialized groups. Click one on the list to make your choice.

Step 4

On group listings, scroll down and click on the group of choice

On the group listings, scroll down and click on the group you will like to join.

Step 5

Click join group

Click join group. You will be taken to a new window where you will be required to enter CAPTCHA code. Enter the code and click join group below the window. And here, you will have successfully joined a group.   

Step 6

Click 'start a group' to start a group

To start a group, click on 'start a group' on your yahoo menu bar.

Step 7

Choose your new group category and click 'place my new group here'

Choose your new group category and click 'place my new group here'

Step 8

Enter your group name and additional information

Enter your group name; your groups e-mail address and a short description about your group. Click ‘continue’ when you are done.

Step 9

Select your yahoo profile and e-mail address

Select your yahoo profile and email address. Type the code and continue. And here you will have successfully created your group in yahoo. You can begin inviting people to join your new group.

Advanced Search Operators with Google

Andreas describes and demos some of the advanced search operators that Google uses to find exactly the data you want! (Most of these will work in any browser / search engine, by the way!)
From: https://www.youtube.com/watch?time_continue=35&v=fAQwWwZ8fs4&feature=emb_logo

A search operator or a search parameter is a character or string of characters used in a search engine query to narrow the focus of the search. ‘Search Operators’ are specific commands we can use in search engines to refine search results. Search operators are powerful and can save searchers a lot of time, especially since most operators can be used together.

Operator	Description	Example
site:	Get results from certain sites or domains.	olympics site:nbc.com and olympics site:.gov
link:	Find pages that link to a certain page.	link:youtube.com
related:	Find sites that are similar to a web address you already know.	related:time.com
-	When you use a dash before a word or site, it excludes sites with that info from your results. This is useful for words with multiple meanings, like Jaguar the car brand and jaguar the animal.	jaguar speed -car or pandas -site:wikipedia.org
"	When you put a word or phrase in quotes, the results will only include pages with the same words in the same order as the ones inside the quotes. Only use this if you’re looking for an exact word or phrase, otherwise you’ll exclude many helpful results by mistake.	"imagine all the people"
OR	Find pages that might use one of several words.	marathon OR race

8 Car Secrets Only Experienced Drivers Know

Are you one of those drivers who trust their car mechanic fully? Good for you if you’ve found a true professional who takes good care of your vehicle! Unfortunately, not all mechanics are responsible and honest with their customers. There are several things they don't want you to know so that they can take advantage of you when you bring your car in.

SUMMARY:
- The truth is that the biggest problem with the battery comes not from the battery itself but from the wires connected to it. The spots where they're attached to the battery get damaged by corrosion.

- Various car experts state that the earliest you should start to worry about an oil change is after driving a minimum of 7,500 miles.

- You'll probably agree that no one can ignore the terrible screeching of car brakes. But the most likely cause of these terrible sounds is rust on the brake pads.

- Some car service centers attract clients by promising free bumper-to-bumper examinations of their vehicles. After you bring your car in, a mechanic will most likely discover that it has tons of problems — which need to be fixed right away.

- Don't fall for the offer of free lifetime muffler replacement! If you agree to this, you'll just end up paying more money in the long run.

-  Before you drive to the garage, mark the tires with chalk. You can write the letters "RL" on the rear left tire and "FR" on the front right tire. After you get your car back, check where the marks are.

- Few people know that the most widespread reason for the check engine light to appear on your dashboard is because your gas cap isn't fastened well enough.

- Your mechanic may suggest that you buy additives for the engine, gas tank, or transmission. After you agree, you find out that these additives cost you an arm and a leg!

TIMESTAMPS:

"Your car battery should be replaced!" 0:31

"You need to change the oil as soon as possible!" 1:47

"You need to replace your brake pads right now!" 2:43

"Drop in for a free inspection!" 3:51

"Your car might break down if you don't use these services!" 4:31

"I'll rotate your tires!" 5:03

"Your check engine light is on. You must have a serious problem!" 5:57

"Your car needs special additives to run better!" 7:02

From: https://www.youtube.com/watch?v=zZQ39L24W7Q