Five physics questions, one chemistry question, and one geography question. Thanks for the answer

I'm going to try out these seemingly funny questions of yours, hoping to give them points of encouragement.

1 The first question is simple, obviously you don't understand the concept of high pressure and low pressure. High pressure is when the local gas pressure is high. Pressure is the pressure per unit area.

You can build a pipe between the high-pressure bend and the low-pressure area. Then for the gas in the pipeline, the pressure in the high-pressure area points to the low-pressure area, and the pressure in the low-pressure area points to the high-pressure area

2.The second question is more interesting. From a microscopic point of view, the positive and negative charges are protons and electrons.

Why is the same charge repulsive? It can be taken as a philosophical proposition

Let's assume the situation is reversed. The same charge attracts, the different charge repels, so what kind of result will come in the end? It must be that all the same charges in this world will run together, all the protons will run together, the electrons will run together, and the electrons and protons will be far away haha.

This world doesn't exist anymore

3.Same as question 2. Is this what general relativity is about?

4.You don't see the essence of the problem. The phenomenon of power generation is only a process and form of energy conversion, not the source of energy generation. What is more important in power generation is where to find the mechanical energy of wielding an iron rod, such as hydropower, firepower, and wind power, rather than where to find it in the magnetic field.

5.You take that for granted. First, the radius of the nucleus has no effect on the attraction of electrons. I guess it's the radius of the atom.

The use of the verb attractance, or macroscopic classical mechanics, is more vague to describe microscopic problems. In fact, micro problems are much more complex. A more accurate description of chemical properties is the view of energy levels in quantum mechanics.

6.In the first question, the direction of our wind is horizontal, that is, there is no gravitational effect.

It is true that vertically, the pressure is greater than the higher one, but the action of gravity balances this difference. On the other hand, in terms of cause and effect, it is the presence of gravity that causes this pressure difference.

7.When the geostrophic deflection force reaches university physics, especially theoretical mechanics, there will be a more accurate term, called the Coriolis force. This brings us to the question of frame of reference. It is caused by the fact that our earth is not stationary and in a state of uniform motion (it is rotating).

For example, when we are in an accelerating train, do we always feel backwards? If we take the train as a frame of reference, we are subjected to a "non-inertial force". This is because our trains are not moving at a constant speed.

Similarly, the earth is in a circular motion at the time of autobiography, which is a complex non-uniform motion, so there are non-inertial forces.

Hehe, all the current high school students have reached this level, huh? It's better to sigh to yourself! I haven't thought about these problems, but don't look at them when you know!

However, I still have some opinions on a few of these issues:

2.For example, a positively charged particle wants to be stable and wants to be neutral, rather than a positively charged proton to make it more positively charged. In the same way, negatively charged particles also want to get protons of positrons to stabilize them. 3.

In the same way, you can imagine the flow direction of the transformer current, which is actually similar to the second problem.

4.First, let's take a look at the conditions under which the induced current is generated.

a.The circuit is closed and on.

b.The magnetic flux passing through a closed circuit changes.

c.A part of the circuit is cut in the magnetic field (the movement of the cutting magnetic line is to ensure that the magnetic flux of the closed circuit changes, so the 3rd and 2nd are the same condition).

Unless you make a giant iron rod, it will not cause any change in the magnetic flux of the earth, because no matter how your iron rod moves, it will move inside the earth's magnetic field, and there will be no current without a change in magnetic flux, hehe!

5.Here's how I understand it:

The larger the radius, the farther away the nucleus from the surrounding particles, but if stability is also required, a greater force of attraction is required, perhaps to explain why Fe is the most stable.

Wow, Boss, why are you asking these questions? Do we have to analyze these internal causes in the first year of high school?

I know one, the earth's rotation deflection force (referred to as the geostrophic deflection force), which refers to a force that is deflected by all objects on the earth that move horizontally due to the rotation of the earth.

In the case of the Northern Hemisphere, taking the polar plane as an example, the angular velocity of the polar plane is the angular velocity of the polar plane due to the rotation of the earth causing a counterclockwise rotation around its vertical axis. When an object moves relative to the polar ground, the observer standing on the ground will feel that the object is acting on a force parallel to the ground plane, which is called the horizontal geostrophic deflection force. Taking the equatorial plane as an example, at the equator, the plane tangent to any point above it rotates around an axis that passes through this point parallel to the Earth's axis.

There is only angular velocity in the horizontal direction. If an object moves relative to the earth's plane, the observer on the earth feels that the object moving to the east is affected by an upward force, while the object moving west is affected by the downward force. Therefore, it is believed that an object moving in the equatorial plane is only affected by a perpendicular force, which is the perpendicular geostrophic deflection force.

At various latitudes between the equator and the polar regions, the Earth's rotation causes the Earth's ground level to rotate everywhere. This rotation can be decomposed into a rotation about a vertical axis (equivalent to the polar plane) and a rotation about a horizontal axis (equivalent to the equatorial plane). The angular velocity of the ground rotation has components in both vertical and horizontal directions.

So, if the object is to be acted on in both vertical and horizontal directions. Therefore, it is believed that objects moving in the middle latitudes are subject to both horizontal and vertical geostrophic deflection forces.

It's all in these books.

Is a nuclear reaction a physical or chemical change?

Bounty Points: 0 - 2 days and 5 hours until the end of the question.

Physical changes do not generate new matter.

The atom is the smallest particle in the chemical change.

What's going on?

1 The formation of wind is a change in temperature, forming the flow of air, and the pressure of the atmosphere is affected by different clouds, which produces different pressures.

2 This is a property of electric charge, which was discovered by scientists. That's it. It's a fact.

3 Magnets are the orderly arrangement of the molecules of an object, forming the cathode and cathode. His force is his attributes. The form is the same as the electron.

4 Theoretically, there are many factors that affect us, and we can't do it, so we made a small magnet to generate electricity, such as the magnetic electrode on a car.

5 For they maintain the law of gravitational and reaction forces between them, which is also the law.

6 You are right, termites use this principle to make nests, and keep the inside dry.

7 is the deviation of the force of the magnetic field lines on the object caused by the stationary and moving of the magnet. You'll learn later.

Brothers! Your body temperature is the most basic explanation!

If you don't know, check out high school physics!

If you insist on figuring it out!

You dig Newton and Einstein out of the ground and ask! ok？

1.Molecules are constantly moving irregularly, so probability-speaking, their movement in all directions is equal probability, and the average pressure of each molecule is equal, then the pressure of the gas with high molecular density on the gas with low density is greater than the pressure of the gas with low density, and the gas with high density wants the gas with low density to flow.

I'll just ask the first question, I don't have that much time, good luck.

Other brief: f=k*q1*q2 r*r The positive charge is + the negative charge is - f represents the direction then f is + repulsion f is - attraction.

Because the electrons are distributed from the new.

The magnetic flux of the coil does not change.

Knowledge of gravity can be solved.

Sixth, it will not be bad geographical knowledge.

The rotation of the Earth has a Coriolis acceleration.

That's all I can do to wish you success in your studies.

Question 30: The kinetic energy formula of the d mass element shows that the kinetic energy of the prime element, the potential energy and the total energy change synchronously according to the same law, and the three reach the maximum value and the minimum value at the same time.

This is because the protons are connected to each other by elastic forces, not in isolation, and are different from the simple harmonic vibrations of the particles, which are open. When the wave is propagating, the protons continuously receive energy from the upstream protons to increase their own energy, and then transfer the energy to the downstream protons to reduce their own energy. The wave process is not only the propagation process of the vibrational state, but also the propagation process of energy.

Question 46: b; Formic acid chemical formula: HCOOH, the first H is attached to C and the second H is attached to O.

Question 30: d

Fluctuation is different from simple vibration, the mechanical energy of the oscillator in simple harmonic motion is conserved, and the potential energy is the largest at the maximum displacement, while the kinetic energy is the smallest. At the equilibrium position, the kinetic energy is maximum, the potential energy is the smallest, and the mechanical energy is conserved during the vibration process.

Fluctuations, on the other hand, are propagated by one point in the medium that drives another adjacent point in turn. For each prime element, the energy should be non-conserved. When the prime is in the equilibrium position, the kinetic energy is the greatest, and at the same time, it is stretched or deformed the most.

Therefore, the corresponding deformation potential energy is the largest. If the motion reaches the crest or trough of the wave, the kinetic energy is the smallest, and the deformation is also the smallest, that is, the deformation potential energy is the smallest.

30 ac is in equilibrium, the velocity is maximum, the kinetic energy is maximum, the potential energy is 0, and the velocity is 0 in the trough, the kinetic energy is minimum, and the potential energy is maximum. This can be easily judged based on the transverse wave chart.

46B acetylene HC=ch symmetry C is symmetrical, D and both H are combined with O as alcohol groups, so choose B

Chemistry B

1 is hydroxyhydrogen.

Physics problem f float 1=g=8n

f float 2 = density * g * v row = 10n

g metal = 2n

m metal = density = m v = 1333kg m

V row 0 = f float density * g =

v=（h=δv/s=

p = density * g * δh = 25 Pa

It is important to understand what sodium hydroxide reacts with, it does not react with sodium chloride, it can only react with magnesium hydroxide, and because it happens to react completely, the reaction is carried out sufficiently, so the value can be calculated. Also keep in mind that magnesium hydroxide precipitation does not have to be counted in the solute.

Solution: (1) The mass of sodium chloride in the solution after the reaction = 400g x 10 = 40g

Let the mass of magnesium chloride in the sample be x

MgCl2 + 2NaOH = Mg(OH)2 + 2NaCl (precipitation sign not typed).

x 40g-(40 g NaCl includes the sodium chloride in the original sample and reaction.

sodium chloride generated).

95：117 = x : 40g-(

x = (2) Let the mass of sodium hydroxide in the sodium hydroxide solution be y, and the mass of the resulting magnesium hydroxide precipitate is .

mgcl2 + 2naoh = mg(oh)2 + 2nacl

g y z95:80 = : y 95:58 = :z

y = 24g z=

The mass of the sodium hydroxide solution added = 400g + = 384g

24g/384g x 100% =

I hope you agree, thank you.

I'll help you solve the chemistry question:

Solution: (1) The mass of sodium chloride in the solution after the reaction = 400g x 10 = 40g

Let the mass of magnesium chloride in the sample be x

MgCl2 + 2NaOH = Mg(OH)2 + 2NaCl (precipitation sign not typed).

x 40g-(40 g NaCl includes the sodium chloride in the original sample and reaction.

sodium chloride generated).

95：117 = x : 40g-(

x = (2) Let the mass of sodium hydroxide in the sodium hydroxide solution be y, and the mass of the resulting magnesium hydroxide precipitate is z

mgcl2 + 2naoh = mg(oh)2 + 2nacl

g y z95:80 = : y 95:58 = :z

y = 24g z=

The mass of the sodium hydroxide solution added = 400g + = 384g

24g/384g x 100% =

Answer: (omitted) The above method is more complicated, but it is suitable for junior high school students. The calculation results are not reviewed, you can review it yourself.

mgcl2 + 2naoh = mg(oh)2 + 2nacl95 80 58g y z95:80 = : y 95:

58 = :zy = 24g z = mass of sodium hydroxide solution added = 400g + = 384g 24g 384g x 100% =

It's like I'm only a chemistry guy.

Didn't you order me for Shenma???