On the theory of molecular motion 1. The larger the distance between molecules, the larger or smaller the interaction force between molecules? 2. Why does the internal energy of an object change when it absorbs or releases heat, but the temperature does not necessarily change? 3. Why is air easy to be compressed because of the large gap between molecules, while solid and liquid are difficult to be compressed because of the repulsive force between molecules?

On the theory of molecular motion 1. The larger the distance between molecules, the larger or smaller the interaction force between molecules? 2. Why does the internal energy of an object change when it absorbs or releases heat, but the temperature does not necessarily change? 3. Why is air easy to be compressed because of the large gap between molecules, while solid and liquid are difficult to be compressed because of the repulsive force between molecules?

My question focuses on the understanding of molecular motion theory. Let me talk about it
Intermolecular attraction and repulsion exist at the same time at any time, but the external performance is determined by the size of the relationship between them. Intermolecular attraction and repulsion decrease with the increase of molecular distance, but the repulsion decreases faster than gravity!
So there are: when the molecular distance is relatively close, the repulsive force is greater than gravity, and the external performance is repulsive force; when the molecular distance increases to a certain value R0, the repulsive force of gravity will be equal; when the molecular distance is greater than R0, the repulsive force will be smaller than gravity, and the external performance is gravity
Generally speaking, the distance between solid and liquid molecules can still be around R0, while gases are generally much larger than R0. Therefore, for gases, such a distance between molecules will make the repulsion force of molecules almost decrease to 0, so the third problem can be explained
The internal energy of an object is defined as the sum of kinetic energy and potential energy of all molecules
The temperature you said is the macroscopic expression of molecular kinetic energy (EK). EK = ncVt, the calculation formula of molecular kinetic energy of ideal gas, CV is called isovolumetric molar heat capacity, n is the amount of matter, t is the absolute temperature (k)
The molecular potential energy is the energy produced by the interaction between molecules. As I have said, the distance between gas molecules is very large, so we still have the definition of ideal gas. For ideal gas, the molecular potential energy is 0
There is a first law of thermodynamics in heat. The change of the internal energy of an object is equal to the sum of the value of work done and the value of heat absorbed and discharged. What I describe is not very clear, such as what is the specific work done and how to calculate the specific heat absorbed and discharged. The building owner can refer to the heat section of any university physics book
According to the above law, if a body absorbs heat, we can't judge whether there is a process of doing work, so we can't judge whether the internal energy of the body changes. Even if the internal energy of the body changes, how can we conclude that only the molecular potential energy changes? In the case of only the molecular potential energy changes, obviously the temperature doesn't change!
The landlord can help me

Molecular kinetic theory
Q1: the molecule can't be seen or touched? (PS: I know it's small, but how to understand "can't be touched"
Q2: diffusion phenomenon is not limited to different substances in the same state
Q3: gravitation? Repulsion? (PS: according to common sense, "gravitation" is "suction" and "repulsion" is outward expansion. Then, "the decrease of intermolecular distance shows repulsion; the extension of intermolecular distance shows gravitation"
Q4: when the intermolecular force disappears, the elastic limit is? Why?
Please be detailed, but not too abstruse, because I am in the preview stage, thank you

2. For example, when boiling water, the water mist is liquid and diffuses upward into the air and gas. 3. Because actually gravity and repulsion exist at the same time, the two forces decrease with the increase of the distance between molecules, but the repulsion decreases faster; on the contrary, repulsion

It is known that the solutions of the equations {2x + 3Y = 3 and {3x + 2Y = 11 about x.y are the same, so we can find the value of A.B
The equations {2x + 3Y = 3 and {3x + 2Y = 11 for X. y are known
ax+by=-1 2ax+3by=3
The solution of A. B is the same

Did you write the wrong symbol in your title? The first equation should be 2x-3y = 3
2x-3y=3,3x+2y=11,
The solution is: x = 3, y = 1
So 3A + B = - 1, 6a + 3B = 3,
The solution is: a = - 2, B = 5

The equation of the line L is 2Y = x = 4z-2, and the equation of the surface formed by one revolution of l around the y-axis is obtained

Let P (x, y, z) be any point on the rotating surface, which is rotated by the point P0 (2Y, y, 1 / 2 (y + 1)) on the straight line. The distance from P to y axis should be equal to the distance from P0 to y axis. That is, x ^ 2 + Z ^ 2 = (2Y) ^ 2 + [1 / 2 (y + 1)] ^ 2. The equation of the rotating surface is as follows:
4x²-17y²+4z²-2y=1

A few about fifth grade level score mixed operation!
1.56 / [1.6 * (quarter + 0.125)] 8.93 - two and eleven seven - (one and eleven * twenty three four + twenty three four) (one third - one seventh) * 21 + two and five quarters * 7-18 * 0.7 [14.8 + (three and seven thirds - 1.5) * one and twenty five three] / two and two thirds + 3.6 is a bit messy. Please understand. I won't score

1,1.56/[1.6*3/8]=1.56/0.6=2.6 2,8.93-29/11-(13/11*4/23)=8.93-29/11-52/253=8.93-719/253=1540.29/253 3,4/21*21+7=4+7=11 4,[14.8+25/14*28/25]/8/3+3.6=14.8+2/8/3+3.6=6.3+3.6=9.9

1、 Given that a > 0 and a is not equal to 1, f (loga is the base, X is the real number) = {A / (the square of A-1)} * {X - (1 / x)} find the expression of function f (x), (2) judge f (x)
2、 Given that the function f (x) = loga is the base (the square of ax - x + 0.5), when a = 3 / 8, (1) find the monotone decreasing interval of function f (x) (2) when 0

Let loga be the base and X be the true number = t
The t power of x = a is brought into the original equation
F (T) = {A / (a * A-1)} * {t power of A-1 / T power of a}
Then change t to X
Get f (x)
Score 0

Given that x, y, Z satisfy X-Y + 5 ≥ 0, X ≤ 3, x + y + K ≥ 0, z = 2x + 4Y, the minimum value is - 6, then the constant k =

It's 0

The equation steps of questions 3, 4 and 5 on page 108 of mathematics book I of Grade 7 are fast
This is the question: (1) (x + 10) 12 = (x + 2) 7
（2） 0.9x-250=250*15.2%
（3）5/8x+4=7/11x+1
If it's fast, it'll add another 5 points!

（1）(X+10)\12=(x+2)\77(X+10)=12(x+2)7x+70=12x+247x-12x=24-70-5x=-46x=46/5=9.2（2）0.9x-250=250*15.2%0.9x=250*15.2%+2500.9x=250X1.1520.9x=288x=320（3）5/8x+4=7/11x+15/8x-7/11x=1-4(55-56)/88x=-3-1/88x=...

What is the polar equation of x ^ 2-y ^ 2 = 16?

x=ρcosθ
y=ρsinθ
So ρ & sup2; Cos & sup2; θ - ρ Sin & sup2; θ = 16
ρ²(cos²θ-sin²θ)=16
ρ²cos2θ=16

It is known that a and B are mutually different positive numbers, a is the mean of the equal difference of a and B, and G is the mean of the equal ratio of a and B, then the size relationship between a and G is ()
A. A＞GB. A＜GC. A≤GD. A≥G

A = a + B2, g = ± AB can be obtained from the meaning of the title, and a ≥ G can be obtained from the basic inequality if and only if a = B takes the equal sign, and a and B are different positive numbers, so a > G, so a is selected