Ask an energy question, a question about energy

In a situation where there is no gravity, the water of tap water can also flow out, which is the same as human blood, it flows in the human body, once there is a wound, then due to the compression of the heart, the blood will be squeezed out of the body!

If you study the faucet, you can understand that the water comes out definitely not by gravitational potential energy. You turn on the faucet just to control the size of the faucet outlet, and the wound is the same reason, if the wound is large, there will naturally be more bleeding! Let's say the faucet in your house is flushed, and you turn on the faucet, the water will still come out!

Landlord, you overlooked a problem!

The kinetic energy of water is converted from gravitational potential energy, this sentence is a bit far-fetched, right?

In the waterworks, there are pressure pumps in various places, and their function is to make the water have enough "kinetic energy" to press the water to a 20-meter building for human use!

The hydraulic pump is a machine, which is powered by electric energy, if you do not use water on the 20-meter floor, then the load of the hydraulic pump will be smaller, if you boil the water very much, the load of the hydraulic pump will be larger, and its electricity consumption will be different!

The water pressure pump of some old houses is very old, so even the water on the 5th floor can not be pressed, the water is very small, so the water you see now is the "kinetic energy" provided by the water pressure pump, and the water pressure pump is actually the electricity of the power plant! Convert electrical energy into the kinetic energy of water!

The landlord said that the excess energy is the electrical energy of the power plant!

The water in the pipes has always been there.

The faucet flows fast, the pump fills the water pipe with water, and the more work is done in the same time, the more work is done, that is, the greater the kinetic energy of the flowing water. That is to say, the kinetic energy of the flowing water is obtained from the pump, and the energy does not disappear.

Energy does not arise and disappear in a vacuum, only transforms into each other.

It can also be dissipated by heat energy.

So the faucet generates heat, but the water is icy, so it's not easy to notice.

Because as long as the object is high in the old gravitational potential energy, in the water dragon with the downstream city, the neutral city can be converted into kinetic energy'

The landlord has heard of the water pump, and I heard that this can only be used when it is plugged in.

The piping system is.

The pump keeps a constant pressure to make the water flow.

There are a variety of energy conversion methods, all of which involve conversion efficiency, and there will be some losses.

Coal power generation is the conversion of chemical energy from coal into thermal energy, and the thermal energy into mechanical energy, and then from mechanical energy to electrical energy.

Fuel cell: Directly converts the chemical energy in the fuel into electrical energy through a chemical reaction Internal combustion engine: converts chemical energy into mechanical energy.

Hydropower: from potential energy to mechanical kinetic energy, mechanical energy into electrical energy electric furnace: from electrical energy to thermal energy.

Electric motor: from electrical energy to mechanical energy, etc.

From its definition e=mgh, we know that m and h can only do work when they are converted into m and v, that is, they can do work by converting potential energy into kinetic energy (e=mv2 2). Specific examples, such as a stone hanging from a high place, can only hurt a person if it falls.

Stones placed on the ground will not hurt people, and in the same way, chemical energy can be converted into heat energy, and electrical energy can be converted into mechanical energy to do work. In this way, "work is a measure of energy transformation" can be understood.

It is like this, the formula for calculating the work: w f*s

where s is the displacement of the object, and this displacement is related to the selection of the reference object.

When the sedan car is selected B as the reference, the lead is closed, and when C is selected as the reference, the displacement of A is different, and the calculated work is also different, that is, the calculation of the work is related to the selection of the reference. You're right.

The kinetic energy theorem solves: The resultant external force is only 10n