The Coronavirus Thread

[rainbow]

Bourouiba, a fluid dynamics scientist at MIT, has spent the last few years using high-speed cameras and light to reveal how expulsions from the human body can spread pathogens, such as the novel coronavirus. Slowed to 2,000 frames per second, video and images from her lab show that a fine mist of mucus and saliva can burst from a person’s mouth at nearly a hundred miles an hour and travel as far as 27 feet. When the sternutation is over, a turbulent cloud of droplet-containing gas can remain suspended for several minutes, depending on the size of the droplet.

https://www.nationalgeographic.com/scie ... in-photos/

That is about 9 m in civilised units.

[JimC]

8.23 m...

[Brian Peacock]

God, you're such a pendant sometimes.

[JimC]

Yes. Yes I am...

[JimC]

Actually, if I was a crazed pedant, I would have stated 5 decimal places...

[Scot Dutchy]

How did you do with a slide rule or logs? Did you use 6 figure logs?

[Svartalf]

man, you're showing your age... I swear I never even saw a slide rule or log table in my life.

[Hermit]

Bourouiba, a fluid dynamics scientist at MIT, has spent the last few years using high-speed cameras and light to reveal how expulsions from the human body can spread pathogens, such as the novel coronavirus. Slowed to 2,000 frames per second, video and images from her lab show that a fine mist of mucus and saliva can burst from a person’s mouth at nearly a hundred miles an hour and travel as far as 27 feet. When the sternutation is over, a turbulent cloud of droplet-containing gas can remain suspended for several minutes, depending on the size of the droplet.

https://www.nationalgeographic.com/scie ... in-photos/

That is about 9 m / 160 km/hr in civilised units.

[Hermit]

God, you're such a pendant sometimes.

Makes me wonder who JimC hangs around with.

[JimC]

How did you do with a slide rule or logs? Did you use 6 figure logs?

I have an app...

[Hermit]

How did you do with a slide rule or logs? Did you use 6 figure logs?

I have an app...

My father taught me how to use a slide rule. In those days high tech calculators were noisy, mechanical devices with a crank handle on the side. They weighed a couple of kilos. Learning calculus at school involved the use of a book of tables and a ruler. The ruler made it less likely to accidentally slip into the wrong row while searching for the appropriate column.

I no longer know how to do calculus. Arguably, I never really came properly to grips with it. The limit of my mathematical capabilities is probably doing differential equations. Maths is lovely. Unfortunately she spurns me.

[JimC]

I still have my father's slide rule. At school, we used a booklet of tables, logs and trig mainly. I got a simple calculator for uni, but now have a variety of tools I can use. I particularly like graphing utilities...

[Scot Dutchy]

Well we used log tables for everything as side rules unless they huge were not so accurate. I never liked them. For normal maths we used four figured tables but in physics we used six figured tables. They were considered extremely accurate. We also had to do everything in Imperial and metric which drove you mad with the conversions.

[Tero]

I have some 2 slide rules somewhere. Hard to sell. In the 90s I had a circular slide rule in the car for getting gas mileage. But in the heat of the parking lot at work ot eventually warped, almost melting.

[Hermit]

Back to the rona: Sydney will likely follow Melbourne's path to the second wave. This is a photo taken outside the the Golden Sheaf Hotel in Double bay after pubs were allowed to open again:



Social distancing? What's that?

The pub enforced the rule of no more than one person per four square metres. The publican contacted police to disperse the approximately 250 people who formed that queue waiting to get inside.

Fucking morons. All of them. Especially since they ought to have become aware by now how rapidly the pandemic has flared up again in Melbourne and many places overseas, following the relaxation of restrictions.