# Things I've learned the hard way . . .(Part 2)

#### thermal guy

##### Well-known member
When The outside source is the bottom of a garbage can that stop your inertia I agreeš

#### Chauncey Gardiner

##### Well-known member
CPF Supporter
What I learned the hard way was that some instructions are critical. Take the warning to close the top of your wheeled garbage can before moving it. You know the big ones that are tapered up and get bigger at the top? The lid is so big if you donāt close the lid first and you go to push the can the lid is so big it drags on the ground. At this point you will step on said lid while pushing. This will stop all forwards momentum of the can but your inertia will keep you going and thereās only one place your heading! On a side note they aināt easy to get out of when your face is smashed into the bottom and your shoulders are wedged against the sides. Seriously who designed these things?!

My father learned the hard way that it's not a good idea to climb into one of those containers. He did so to stomp the contents down. It rolled. He fell. His back broke. He went to the hospital.

#### Katherine Alicia

##### Well-known member
if you lend a "friend" some money and never see them again, consider it money well spent!

#### richbuff

##### Well-known member
CPF Supporter
Supporter
Lol. I hate it when I take out the garbage and suddenly become a physics experiment.
If you want to do the math, don't forget that work = Kinetic Energy, which in turn is the integral of momentum. Mass times velocity is momentum, but the Work is KE, which is one half mass times velocity squared. When you integrate, don't forget to add + C.

#### thermal guy

##### Well-known member
I have now also learned that I donāt like math!š

#### richbuff

##### Well-known member
CPF Supporter
Supporter
I have now also learned that I donāt like math!š

It is a whole new world to explore. Math is pure logic. The purpose of math is to quantify science. The integral of something is the area under the curve of something. Circumference is pi times diameter, which is pi times 2 x the radius. The area of the circle is the area contained by the circumference. The integral of kx is equal to one half k times x to the n+1 power, divided by n+1. Any 1/2 kx squared is the integral of kx. So, pi times 2 times r is the circumference, and the area is the integral of that, which is pi times r squared, because the 2 in the numerator and the denominator cancel each other out when you integrate.

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#### PhotonWrangler

##### Well-known member
Pi is also used in electronics for calculating resonance and reactances.

And Pi + raspberry = \$40 computer.

#### Monocrom

##### Well-known member
Supporter
I have now also learned that I donāt like math!ļ

#### raggie33

##### *the raggedier*
that cats are spawn of satan! years ago a cat was rubbing all over me and purring i go to pet it and it went insane

#### raggie33

##### *the raggedier*
Pi is also used in electronics for calculating resonance and reactances.

And Pi + raspberry = \$40 computer.
im waiting till they make it as fast as todays i7s

#### PhotonWrangler

##### Well-known member
Today I realized that I need to keep a stash of band-aids in my car's glove box. I reached under the seat for something and sliced a finger on a sharp piece of metal. Fortunately I had a couple of clean paper napkins so I wrapped one around my finger and held it there until I got home.

#### Monocrom

##### Well-known member
Supporter
Today I realized that I need to keep a stash of band-aids in my car's glove box. I reached under the seat for something and sliced a finger on a sharp piece of metal. Fortunately I had a couple of clean paper napkins so I wrapped one around my finger and held it there until I got home.

Definitely a good idea. I keep a full First-Aid kit in my Workbag. When not by my side at work, my bag lives in my car.

#### PhotonWrangler

##### Well-known member
Handling a 2 liter bottle of pop while you're barefoot is a bad idea

#### PhotonWrangler

##### Well-known member
Don't store packets of condiments in a bag that might get squished. :shakehead

#### Hooked on Fenix

##### Well-known member
Don't set a bright flashlight turned on high on top of a black backpack. I went night hiking and set my Nitecore E4K (on at the 1050 lumen high setting) on top of my Golite Pinnacle backpack. It sunk into the fabric a little, aiming the beam at the black and dyneema grid fabric. After a few seconds, the backpack started smoking. I took the light off immediately. The light didn't burn a hole through the pack but did leave a burn mark. I almost set my backpack on fire with my flashlight (at 25% maximum brightness).

#### greenpondmike

##### Well-known member
that cats are spawn of satan! years ago a cat was rubbing all over me and purring i go to pet it and it went insane
They taste good in chinese food though

#### greenpondmike

##### Well-known member
I learned the hard way...before you marry someone go ahead and put forth that ol ugly foot you've been hiding and be yourself. Get them angry just to have a sneak preview of what you're going to live with the rest of your life. If you can't handle it.....run!

#### PhotonWrangler

##### Well-known member
I recently bought a light that requires a 21700 cell. It didn't come with one so I borrowed the Fenix-branded 21700 from my trusty PD-36R and it didn't fit lengthwise in the new light. I checked the label on the cell and it said 21700, So I looked up the specs for a 21700 and fount that it's supposed to be 70mm long, however the Fenix cell comes in at 75mm. So I ordered an actual 21700 for my new light.

The Fenix-branded cell is beefy and lasts for a long time, however I now recall that the vendor mentioned that they were non-standard-ish. Now I know that it's the length. This should really be called a 21750 battery.

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#### Jean-Luc Descarte

##### Well-known member
Learned the hard way this Monday that if you spend a year and a half off your bicycle, a basic 7km commute can become a grueling slog. Don't try to match your old rhythm, pace yourself according to what you can do at this moment.

On a very similar note, I also learned that flabby wheels are VERY demanding to pedal on. Always check your tires' pressure before leaving home, guys.

#### PhotonWrangler

##### Well-known member
Apparently it is possible to take in too much dietary fiber at a meal. Still paying the price two days later.

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