Looking for people who are good at solving physics problems, I want to find a few knights who are go

To the question of the buoyancy.

I like to use simple methods to solve physics problems, in fact, physics and mathematics are interconnected. Presumably my sister is still a junior high school student!

So I'll give you an example on this topic. It's a lot like a similar triangle.

When all the metal invades (sorry, I can't spell that word) the buoyancy is 2N, and when the intrusion is half, it corresponds to 1N, but the premise is that it invades the water, and the density of the water is 1. When it invades only half the density of alcohol, the buoyancy is two, and when it invades all, the buoyancy is two, ie.

What you need to understand to learn buoyancy is that the denser the liquid is, the greater the buoyancy generated when the same volume of liquid (i.e., the volume of a sinking object) is displaced. Therefore, the buoyancy of an object in mercury is the greatest, because mercury is the densest liquid in the world.

When the density is the same, of course, the larger the displacement volume, the greater the buoyancy. In addition, in the same liquid, a solid object receives the greatest buoyancy only when it sinks completely, because this is when the displacement volume is maximum.

It is also important to note that the total volume of water has nothing to do with the buoyancy it can generate, and a little bit of water can also produce a lot of buoyancy. For example, if you take two same basins, put a small amount of water in one and put the other on top, because they are the same basin, the water in it can be drained out, and you can feel the force required to drain it all.

The larger the pot, the more obvious the effect.

Pure hand-played. Thank you.

Known: v null = 340m s v iron = 5000m s t = 2s Find: s solution: v = s t

t=s v, again by the title t empty - t iron = t

s t empty -s t iron = t

s = v empty * v iron * t (v iron - v empty ) = (number of bands calculated) = A: This section of the railway.

When you first start studying physics, it is important to have a good problem-solving habit.

Set the length of the railway xmYou can get:

x 340 - x 5000 = 2 The result is.

Let this section of the railway be long l, and the time difference between the two sounds produced by the propagation of the railway and the propagation of the air is 2s, then.

l/340-l/5000=2l=

Let the first sound be heard for x seconds, then x*5000=(x+2)340 "Because sound travels slower in air than in steel" is solved x=, bringing into the original formula, 5000*

340*2=680 Set air propagation for x seconds 5000x-340x=680 x= 5000x= I don't know if it's right, let's take a look.

Solution: 1. After connecting AC, connect with B to the power supply for high-end, AB or BC reception power for mid-range, and connect AC to power supply for low-grade;

2. The high temperature heating power is 200W; The resistance of the medium temperature gear is twice that of the original, the voltage is unchanged, and the power of the medium temperature gear is 100W from p=U (to the 2nd power) R; The resistance of the low temperature gear is 4 times that of the original, the voltage is unchanged, and the power of the low temperature gear is 50W from P=U (to the 2nd power) R.

The nameplate of 3 electric hot pots.

Name: Household rice cooker.

Rated voltage: 220V, frequency 50Hz

High, medium and low three gears: the heating power of the high temperature gear is 200%, the heating power of the medium temperature gear is 100%, and the heating power of the low temperature gear is 50W

Date of manufacture:

Factory Name:

(1) The first question uses the kinetic energy theorem m1gr-m2g*, which refers to the square of the velocity) (2) When the velocity of the first question is greater than or equal to zero, look at the relationship between m1 and m2 (3) The velocity is still found with the help of the first question: First of all, this is a flat throwing motion 2*r=the square of time) s=v*t

In this way, the results can be obtained.

It's not easy to type, and I hope I can adopt it after reading it.

Applying pressure to a solid decreases the atomic spacing in the direction of --- pressure --- increases --- the atomic spacing in the direction of the perpendicular pressure ---

2) The higher the temperature of the liquid, the lower the pressure--- the ---

3) The dissolution rate of the solid in the liquid body increases with the increase of temperature--- decreases with the increase of the density of the solid------ and increases --- with the increase of the density of the liquid---

4) The higher the altitude of the void, the more dense the gas molecules -- the smaller the movement speed of the gas molecules--- the smaller the pressure of the gas --- --- smaller--- the molecular density of the air is about one thousandth of the molecular ---density in water.