You are correct. The diameter should be 6 feet and the radius 3 feet.
That means people would only be at least 3 feet away, not 6 feet. The original assumption was right.. need a 6 foot radius, 12 foot diameter to meet social distancing guidelines
It’s a circle-packing model, which means there’s no overlap between the exclusion zones. A radius of 3 feet means you’re at least 3 feet away from the edge of anyone else’s circle. They are at the center of their circle, which is an additional 3 feet away, for a total of 6 feet.
I don't know it is easy to translate feet from US to German. I just need to know which city the unit refers to: https://en.m.wikipedia.org/wiki/Obsolete_German_units_of_mea... /S (honestly, once the US empire is gone for good, historians will have a good laugh about their stubborn refusal to adopt the metric system. Must be the worst case of NIH in history)
To be fair, over here in the UK, we have MPH for roads, stones and pounds for peoples weight (kilograms are becoming more popular, in particular for the under 25s), feet and inches for peoples height (meters becoming more popular for under 25s). So we have a bit of a hybrid really, I am 36 so get a bit of both, but my parents need everything converted to "old money" as they call it, they can't imagine what 25cm lengt…
More U.K. “fun” examples:
• Beer served in pints by on-licenses, millilitres by off-licences
• Even though distances are all in miles, and petrol/diesel sold in litres, fuel efficiency is in either g/km or miles-per-gallon
You are correct. The diameter should be 6 feet and the radius 3 feet.
That means people would only be at least 3 feet away, not 6 feet. The original assumption was right.. need a 6 foot radius, 12 foot diameter to meet social distancing guidelines
You are not accounting for the fact that next person is not at your circle edge but is inside his own circle, and it is his circle touching yours, not the center of his circle, so 2 persons inside 3 feet radius circles have 6 feet of distance in between.
Your assumption is correct if you overlap circles in a way that everyone is on edge of someone else's circle.
As a more practical usecase, how many other EEs have leveraged circles-in-a-circle packing tables such as [1] to approximate cable diameter and/or size conduit?
Would be interesting to learn how other disciplines have applied such a tool to solve real-world problems.
You can fit all the humans on earth into a 1km cube. Average volume of a human is 66l [1]. Make it 130l to allow some unused space due to imperfect packing. 7.6 billion * 130l = 988 000 000 000 liters. 1 cubic kilometer = 1 000 000 000 000 liters. [1] https://www.wolframalpha.com/input/?i=average%20volume%20of%...
To be fair, over here in the UK, we have MPH for roads, stones and pounds for peoples weight (kilograms are becoming more popular, in particular for the under 25s), feet and inches for peoples height (meters becoming more popular for under 25s). So we have a bit of a hybrid really, I am 36 so get a bit of both, but my parents need everything converted to "old money" as they call it, they can't imagine what 25cm lengt…
More U.K. “fun” examples: • Beer served in pints by on-licenses, millilitres by off-licences • Even though distances are all in miles, and petrol/diesel sold in litres, fuel efficiency is in either g/km or miles-per-gallon
>• Beer served in pints by on-licenses, millilitres by off-licences
Sure but a pint is defined as 568ml. The only one that really is quirky is how people haven't yet grasped kilometers yet they're the easiest to grok, it's just 1.6 * miles.
I don't know it is easy to translate feet from US to German. I just need to know which city the unit refers to: https://en.m.wikipedia.org/wiki/Obsolete_German_units_of_mea... /S (honestly, once the US empire is gone for good, historians will have a good laugh about their stubborn refusal to adopt the metric system. Must be the worst case of NIH in history)
To be fair, over here in the UK, we have MPH for roads, stones and pounds for peoples weight (kilograms are becoming more popular, in particular for the under 25s), feet and inches for peoples height (meters becoming more popular for under 25s). So we have a bit of a hybrid really, I am 36 so get a bit of both, but my parents need everything converted to "old money" as they call it, they can't imagine what 25cm lengt…
Canada has gone mostly metric, now, but growing up on a farm a few decades ago, I definitely got a hybrid. People's heights and weights were imperial, other things were mostly metric. Gravel roads were miles, highways kilometres. Oven temperatures were Fahrenheit, human temperatures Celsius. The really perverse one is that when referring to gallons, we had to specify US or imperial.
To be fair, over here in the UK, we have MPH for roads, stones and pounds for peoples weight (kilograms are becoming more popular, in particular for the under 25s), feet and inches for peoples height (meters becoming more popular for under 25s). So we have a bit of a hybrid really, I am 36 so get a bit of both, but my parents need everything converted to "old money" as they call it, they can't imagine what 25cm lengt…
More U.K. “fun” examples: • Beer served in pints by on-licenses, millilitres by off-licences • Even though distances are all in miles, and petrol/diesel sold in litres, fuel efficiency is in either g/km or miles-per-gallon
The metric fuel efficiency measure is litres per 100km.
This way round makes more sense -- "how much will it cost to travel X km" is a more common question than "how far can I travel with Y litres or £Z".