You are able to mark your answers on tests and save your work, while on paper, you get it taken away from you.
Answer:
One sheave means that you are using a single drum winder. They are the worst! Double drum winders control easier, brake better and are much more efficient. They save time ( two skips or cages) and can be clutched to perform faster shift transport. A single drum is slow, unbalanced and can be a nightmare if it trips out during hoisting. If the brake system is not perfect it can be a real hairy experience. For a runaway single drum, there is no counterbalance effect. It always runs to destruction. With a double drum, the driver still has a chance to control the winder to a certain extent and he has two sets of brakes to rely on. A single sheave could also mean a shaft with a single compartment. No second means of escape unless there are ladders or stairways. Not a very healthy situation.
Those are just a few points. I am sure much more can be said in favor of a double drum winder and two or more sheaves in the headgear. Most of the shafts I have worked at have multiple winders and up to ten compartments. They all have a small single drum service winder for emergencies and moves of personnel during shift times. They are referred to as the Mary - Annes. Apparently, the name originated in the U.K. where an aristocratic mine owner named the first such winder after his mistress.
Explanation:
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Answer:
1-2
2-3
3-1
Explanation:
I couldn't find a way to explain this.
Answer:
In reality, a diluted type of acetone that dissolves plastics and coating is Nail polish removers.
Explanation:
The chemical composition of the material has permanently changed, nothing else than if you had shot it. No repair but replacement is available.
Acetone does not get along with plastics.
This classic timelapse video shows just how cheap plastic acetone is.
When it's out, I have my new AirPods Pro. I got a odd smell when I opened the box when I received it. The little one is solid and chemical. It's new, I guess, and after days it will be gone.
But after ten days of use it doesn't. And the smell remains strong. It won't go quickly, I believe.
Instead I noticed that the smell is often shaping the silicone tips.
About 8 hours a day I use this AirPods Pro. Is it possible for a long time to use this smelling tip?
Actually, I must say they are soft and work well for noise cancelation, I love this silicone tip. If the strange smell doesn't hurt. To me, that's good.
Answer:
n! = n*(n-1)*(n-2)*(n-3)* ... *2*1
Explanation:
The factorial operator is simply a mathematical expression of the product of a stated integer and all integers below that number down to 1. Consider these following examples:
4! = 4 * 3 * 2 * 1
4! = 12 * 2 * 1
4! = 24
6! = 6 * 5 * 4 * 3 * 2 * 1
6! = 30 * 4 * 3 * 2 * 1
6! = 120 * 3 * 2 * 1
6! = 360 * 2 * 1
6! = 720
So, the factorial of n would follow the same as such:
n! = n * (n-1) * (n-2) * ... * 2 * 1
Cheers.
