Tag Archives: physics

The Infamous ‘Tacoma Narrows Bridge’ Collapse Happened This Day, 77-Years Ago. Here Are The Videos.

by Anura Guruge




Click to ENLARGE and study here. Wikipedia: en.wikipedia.org/wiki/Tacoma_Narrows_Bridge


I first saw these videos in the early 1970s during some of my physics classes at the University of Swansea. I think I was being taught about simple harmonic motion. But, everybody in my class agreed that my example, i.e., it is the motion of an unconstrained female breast when the subject is running, was even better than watching this bridge collapse.

Just 77-years ago. We have come a LONG WAY!

I hope you have all seen this before — I mean the bridge collapsing, not females jogging.


Related Posts:
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by Anura Guruge

British, Michael Faraday, The Father Of Electromagnetism Was Born This Day 226-Years Ago; September 22, 1791.

by Anura Guruge


Click to ENLARGE and read here. Wikipedia: /simple.wikipedia.org/wiki/Michael_Faraday


Faraday Cage” at the BostonMuseum of Science‘ — taken by I during a June 2016 visit.




Obviously a HUGE name if you ever studied physics or went about trying to get a degree in electrical engineering. Given that I did both in my youth Faraday was a well known — and respected — name. Gather that Albert Einstein thought very highly of him.

His birthday. 226-years ago. What would be be today IF not for Faraday — though it was inevitable that somebody would have made the discoveries he did.


Related Posts:
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by Anura Guruge

Ananda College, Colombo, Ceylon: 1960 to 1967 List Of Prizes Won By Anura W.P. Guruge.

Anura Guruge December 2014 thumbnail.
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by Anura Guruge


Related posts:
>> Ananda College prize giving 1969.

++++ Check Category ‘Sri Lanka’ or search ‘Ceylon’ for other posts >>>>


Click to ENLARGE.

prizes


Doing the post on June 7, 2015 about Udeni Wijegunaratne receiving a prize (in this case a pile of books) at the 1969 Ananda College, Colombo, Ceylon (now Sri Lanka) annual Prize Giving definitely got me thinking.

I knew I I had won a fair number of prizes. How could I forget. Winning prizes was one of the many things that was expected of me. I also knew that I had a document from August 1967, just prior to me leaving Ceylon, of all the prizes I had won. My adoptive father, a professional educator, believed that all these documents that I received an education in Ceylon would be necessary to get me into a public school in Buffalo, New York. Little did he know. I don’t think anybody ever looked at these documents.

Anywho … I wanted to capture and preserve that document for posterity. Now I have. I counted the prizes (and awards). 39.

To me, and to YOU (if you are interested at all), only two things in this list really count.

The Challenge Cups (highlighted in yellow) and the ABSENCE of Grade VI.

I did NOT attend Grade VI — the 1st year of Middle School when you start learning Algebra, Geometry, Trigonometry, Chemistry, Physics and Biology. I was, for my SINS, given a DOUBLE PROMOTION. School year in Ceylon started in January. We had the whole month of December off. My adoptive father told the school that he would make sure that I would learn a WHOLE YEARS worth of all those subjects in a month — and to top it all I got measles or mumps during that month. That did not deter my adoptive father. I was taught, tutored, beaten and punished 12 hours a day UNTIL I learnt all of what I had to — that I was sick, very sick, was not an excuse. This is why working 14, 16, 18 hours a day is a piece of cake for me. Plus now there is nobody who beats me if  I don’t work. And I was 12 years old.

So that was the Double Promotion.

The other BIG thing that was demanded of me was to WIN the damn Challenge Cup EVERY year. Yes, it was a silver cup BUT I never got to keep it. It was for my adoptive parents ego. I see that there was, on average 39 students, in each of my early classes. There were typically 6 classes per grade. So roughly 230 to 240 kids per grade. The Challenge Cup said that when all the grades, and this was the British system where grades are numeric, 0 to 100, were added up I had the HIGHEST aggregate score. First in Class is what they would say in the U.S.

Well as you can see I won that damn Challenge Cup every damn year other than in Grade 3. I think I actually set out to NOT win it. Because I, probably given all the beatings and punishment I took, was quite a devil, already. Well I got beaten to a pulp. All of 1964, and I was 11, UNTIL I won the Challenge Cup again was hell. But what the heck. It made me what I am. My life now is walk in the park. When you had the life I had as a kid you grow up rather immune to most hardships.

Well it gets better. Remember that Double Promotion. Learn a year’s worth of 6 subjects in a month. I was EXPECTED to win the Challenge Cup after that! I think I won one Challenge Cup in Grade VII AFTER the Double Promotion BUT not THE cup. But, I did the following year! And for the WHOLE Middle School. That one was MY doing. After the Double Promotion I was the youngest in the class. I took my stick. So I wanted to stick it to all of them. OH, I got an air rifle, as a present, for winning that! That was big. We had to go to India to get one. You couldn’t get them in Ceylon.

So that was my life in Ceylon. It was hard. I wasn’t allowed a dog or any pets. I wasn’t allowed a bike. (I WONDER whether this has anything to do with why I am surrounded by dogs and toys, like Jags). My life was to study, study, win prizes and most of all the DAMN Challenge Cup. It wasn’t all bad. I had plenty of food, all the books I ever wanted, my own chemistry lab and a fair amount of toys. I also got to travel.

But it has stood me in good stead. So I don’t regret it. I would never dream of imparting what my life was to my kids. I took enough punishment for a few generations.

And SOME people wondered why I did not attend my adoptive father’s funeral (last year) and actually was on a cruise of the day of his funeral.


Lot Of Fun, Educational, Interactive Pendulum Google Doodle For French Physicist Léon Foucault 194th Birthday.

Anura Guruge, June 8, 2013.

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by
Anura Guruge


PendulumSept18Latest Google Doodle posts:
>>
American Jane Addams’ 153rd birthday
>>
Sep. 6, 2013.
>> John Wisden, 187th birthday — Sep. 15, 2013.
>> Google Doodle for my birthday — Sep. 4, 2013.

≡ ≡ ≡ ≡ Check CATEGORY ‘Google Doodle’ for other posts —>>> (side bar)


PendulumGDSep18

Click image to access.

The motion of the pendulum changes per latitude. The second slider lets you see it at different latitudes.
The first slider appears to adjust the speed.

Link updated
to provide access to Doodle from the Google Doodle Archive.


Boston pendulum (from Erica Green’s ‘The Little Review’ blogspot, with thanks.

Foucault pendulums intrigue, fascinate, mesmerize and puzzle me. Yes, of course, having done tons of physics even at college level, I understand the principle. I collect and play with gyroscopes (and break quite a few too in the process so that I am always short). So I know all of that, though until today I did not realize that Léon Foucault came up with the name ‘gyroscope‘, though he was by no means the inventor. While I appreciate the preservation of motion through the gyroscopic action what I don’t get is

The book. I don't think I have read it. One book by Eco was enough for me, I think.

The book. I don’t think I have read it. One book by Eco was enough for me, I think.

The Panthéon in Paris, where Léon Foucault publicly demonstrated his giant pendulum is one of my favorite buildings in Paris. It was quite close to where my adoptive parents lived in Paris, 1978 to 1992. So I would wonder in quite often. I know I have seen ‘the pendulum’ in Paris but after so many years I can’t vouch that I did see the replica now at the Panthéon. I do go and gwak, for as long as possible (until Deanna comes and drags me away) at the absolutely beautiful pendulum, tucked away in the corner, at the Boston Museum of Science. Just captivates me. What I don’t still get is why the rotation of the hook that it is attached doesn’t dampen the motion. I will have to look into this.

Here is a good article on the physics of the pendulum from Wikipedia.


Educational & fun slideshow on pendulums. Worth watching.

Educational & fun slideshow on pendulums. Worth watching.


Click to access Wikipedia entry.

Click to access Wikipedia entry.


Educational video on Foucault's pendulum showing one at the Paris Pantheon.

Educational video on Foucault’s pendulum showing one at the Paris Panthéon. Click to access.


Losing 20 Pounds In Body Weight Has Really Done A Job On My Swimming Buoyancy.

Anura Guruge, June 8, 2013.

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by
Anura Guruge


Related posts:
>> My first swim in the lake in 2013 … — July 8, 2013.
>> Water temperature in Halfmoon Lake … — June 30, 2013.


I have to admit that I am still rattled by the lack of buoyancy I discovered, to my cost, on Sunday when I went swimming.

Wow. I have been doing some research. It appears that I have lost about 2 pounds of lift. That doesn’t sound much but that is about 40% of the buoyancy required to keep a person afloat.

The biggest thing I noticed was that I was floating vertically! That was scary. But, now it makes total sense — and this diagram shows it all.

Most of the 20 pounds of fat came off my waist and a bit off my chest.

Having that fat on my waist previously lifted my waist up so that I was horizontal. Now without that fat, my lower body sinks.

I am sure that I will get used to this.

Divers know about this. When they lose weight they reduce the amount of free weights they use.

But, I am not sure whether this issue is ever talked about in normal weight loss discussions. This could be dangerous. Somebody who has say lost 50 pounds might think that he/she can now swim better and dive in — without realizing that they are going to experience one heck of a shock.