Physics Problem 1 2 meters of plastic bucket buried deep in the soil 200

First of all, determine what is inside, if there is something inside, then it is under pressure on the barrel wall, and the plastic barrel is buried in the ground for a long time, the plastic may age, and the surrounding soil is dug up rashly, then the pressure of the things in the barrel is all borne by the barrel wall, which is very likely to cause the barrel wall to crack, so that the contents of the barrel leakage, or cause damage to the contents of the barrel.

Here's how: as you might expect, it's a bit of engineering, but the first purpose is to keep the walls intact.

Method, 1. At a certain distance from the barrel wall, estimate it yourself, dig a circular ditch around the plastic bucket, the depth of the ditch is greater than, so that there is a mud wall attached to the plastic bucket wall to protect the plastic bucket, and the thickness of the mud wall depends on the condition of the barrel (that is, the distance between the circular ditch and the barrel wall).

2. After digging the ditch, fill the ditch with water, and then gradually dig the mud wall surrounding the plastic bucket, and keep the water level in the ditch when digging the mud wall.

In this way, when the soil is removed, the water pressure will bear part of the pressure in the bucket. Reduces the pressure of the contents of the barrel on the barrel wall.

The above methods are personal and should only be used as suggestions.

I have a method that depends on the nature of the soil, and if it is sandy, the success rate is higher. This is done by sprinkling water around the plastic poke and then finding a vibrating farm machine to work around the bucket. The sand will become loose due to the vibration, and the bucket can be removed with a small amount of excavation.

For the specific principle, please refer to "Sand liquefaction".

Find a few more people, everyone will work together, if it doesn't work, call the children, it's always good to have more people - manpower is ready;

Because the plastic bucket is some years old, it may be fragile, so you can't use hard things, the support parts can be rigid, the contact with the barrel should be soft, it is recommended to wrap a soft cloth or sponge, and it is best not to stand on the side of the barrel to prevent the surrounding soil from disintegrating, if the barrel is not heavy, it is recommended to use a resistance arm, if it is heavy, everyone will go together - the material resources are good;

As for whether the soil around the bucket should be dug out, it depends on where the bucket is in your house, and if it is difficult to dig the soil, it is recommended to operate it mechanically.

Of course, if this plastic bucket is not commemorative, it is recommended to buy a new one for good deeds, it should not be expensive. Besides, it's been buried in the ground for several years, and it shouldn't take long to dig it up and use it again.

It's not easy to hit by hand, but it's okay

Dig out the soil from the outer edge of the bucket and fill it slowly until it can be moved.

Dig up the soil next to it, and pry it up with something harder.

10l=, capacity 1000kg m

Honey quality. Honey density.

Plastic is an insulator that is not easy to conduct electricity, when gasoline is loaded in plastic barrels, the friction between the barrel and the oil will be electrified during transportation, and the charge of the oil and the barrel will be discharged after accumulating more, resulting in electric sparks igniting the gasoline.

Gasoline is known to be a flammable substance, and when gasoline is shipped in plastic drums, the plastic drums are electrified due to the constant friction of the gasoline against the walls of the barrel during transportation. And because plastic is an insulating substance, the charge on the barrel is not easy to transfer and transfer, so that the charge on the barrel accumulates more and more. When the charge on the barrel accumulates to a certain level, the phenomenon of discharge occurs, and the spark generated by the discharge can ignite the gasoline, causing a fire or burn accident.

Therefore, it is strictly forbidden to use plastic barrels for gasoline.

Friction generates static electricity that cannot be channeled into the ground through the barrel.

Gasoline in plastic barrels, in the process of transportation, gasoline and plastic barrels rub electricity, plastic is an insulating material, can not be transmitted away, so that the barrel produces sparks, ignition of gasoline, and fire.

Gasoline and plastic barrels will rub against static electricity to produce static electricity, and plastic barrels can not effectively conduct static electricity to the ground, which will produce sparks, causing gasoline to catch fire and cause danger.

Gasoline and plastic drums rub against electricity, causing sparks to occur in the barrels and causing fires.

Oil and plastic barrels rub live plastic is an insulator can not conduct electricity when the charge is more than a certain extent, so it is strictly forbidden to use plastic barrels to transport gasoline and sprinkle.

Because the oil will rub against the barrel, it will cause electricity (triboelectric electricity) and cause a disaster.

1.The mass is known in this question, and in addition it is known that the density of water is = so, volume = volume of water = m =

2.It is known that the volume is 20L (, and the density of Sprite, so with this kind of barrel Sprite, the mass that can be filled in each barrel m =

That is, the maximum amount of Sprite that can be installed.

The density of water is 1000kg m3

20kg of water, 20 1000=

If the entire bottom of the object is on the table, then p=f s=200, if the object is half of the bottom surface on the table, then p=f (s2)=200, and the pressure value should be between the two, i.e. 2000pa 4000pa. So this question chooses BC.

BC is right, the process is the same as above.

Explained from a physical point of view:

Oil and plastic barrels will rub against each other, generating electric charges (that is, frictional electricity), and plastic barrels are insulators, can not be generated by the charge away, in this way, more and more charges, accumulated to a certain extent, will produce discharge phenomenon, in the discharge phenomenon, will form an electric spark, electric spark will ignite the oil, will form **.

Therefore, the general oil should be loaded with conductor materials, so that the charge generated by frictional electricity can be guided away in time to avoid danger.

Get it o( o

Similar and dissolving. Petroleum is organic, and it dissolves organic matter such as plastic drums.

Because oil is organic, and plastic can be dissolved into oil, just like you can use gasoline to wash off paint. If you don't have enough speed, it will be slow, but if you use a plastic bucket, it is still dangerous.

There are steel wires in the carpet in order to release the static electricity generated by the friction between people walking and the carpet to the earth in time, so as to avoid the harm caused by static electricity to people or household appliances. Generally, when the oil is loaded in an iron drum, an iron chain will be held on the ground during the transportation process to release the static electricity on the oil drum to the earth, and the oil is loaded in a plastic cylinder, and the plastic is an insulator, and the static electricity generated during the transportation process cannot be released, and it is easy to produce sparks and occur. Digging the Tomb of Honor.

1.I bring friction electricity into the ground.

2.Plastics are easy to be electrolyzed by friction, and they are electrolyzed by friction.

1) In order to allow electricity to be channeled underground, so as not to cause accidents.

2) Plastic friction is easy to electrify, resulting in oil burning or **!

1. Conductive. 2. Avoid frictional electrification.

Friction generates heat so that the gasoline reaches the ignition point, and then, and then it catches fire.