jrmichler's latest activity
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Jjrmichler replied to the thread A Ramjet effect on drone.Yes, this is a well known effect. Search terms p51 mustang radiator thrust will bring up several good hits. The Wikipedia article is a...
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Jjrmichler replied to the thread Random Photos.When deer see apples overhead, they can stand on their hind legs to get them. That tree had about 90 lbs of apples this year. I...
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Jjrmichler reacted to fresh_42's post in the thread What did you do with your old college textbooks? with
Like.
My "like" was for Garfield, of course! -
Jjrmichler replied to the thread What did you do with your old college textbooks?.Same here, except ME.
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Jjrmichler replied to the thread B Basic thermal energy transfer physics: Insulation value in open airways vs sealed airways.Been almost 50 years since I took basic heat transfer in college, so I had to do some homework in order to do heat transfer film...
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Jjrmichler reacted to symbolipoint's post in the thread States of matter: "viscoelastic fluid", familiar term is "cream" with Like.
Hey, @jrmichler ; I just tried a search in which I asked a question as input field of the search engine (related to "plastic solid")...
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Jjrmichler replied to the thread States of matter: "viscoelastic fluid", familiar term is "cream".Here's a couple more terms. Plastic solid is a solid with a yield point. After yielding, it will continue to deform without limit...
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Jjrmichler replied to the thread I need a concave mirror with a focal length of 150 feet.Much of the hot air does not actually add heat to the surface, but it does give a good upper limit to the amount of heat needed. Using...
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Jjrmichler reacted to sophiecentaur's post in the thread I need a concave mirror with a focal length of 150 feet with Like.
Many thanks for doing the leg work in this one!! An interesting result I was looking for a practical example of this and I realised...
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Jjrmichler replied to the thread I need a concave mirror with a focal length of 150 feet.I just finished doing some heat transfer calculation for something else. It's been a long time, so getting back up to speed took time...
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Jjrmichler replied to the thread Medical New Alzheimer's Treatment Clears Plaques From Brains of Mice Within Hours.I have been collecting articles and papers on lifestyle vs health. Here's some about dementia: Healthy lifestyle reduced risk of...
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Jjrmichler replied to the thread A practical way to vaporize fuel for high MPG?.A rule of thumb is that a typical normally aspirated automobile gas engine burns 0.5 lbs of gasoline per horsepower-hour. Since...
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Jjrmichler replied to the thread I need a concave mirror with a focal length of 150 feet.I calculated the sun image diameter assuming: Sun 865,000 miles diameter Sun 93,000,000 miles distant Focal length 150 feet Perfect...
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Jjrmichler replied to the thread In the early days of electricity, they didn't have wall plugs.About 1980, my grandmother had her wash machine plugged into one of these adaptors. I asked her if that really worked, and she said...
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Jjrmichler replied to the thread HP Required to move a robot 10meters at 1.5m/sec.You are correct. For moving 4000 lbs, you need some math. Here is how I solve this type of problem. Step 1: Sketch an acceleration -...
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