Ask a few physics questions. Ask a physics question?

That's just what we're learning this lesson.

Let me tell you.

1 Your experiment is wrong, maybe you didn't get the focus clear, wrong.

2 Reality can be seen clearly by the human eye and can be presented on a light screen, and has nothing to do with standing upright. Virtual images can be seen by the human eye, and cannot be presented on the light screen, and have nothing to do with handstands.

3 Convex mirror Concave mirror is opaque, and even light will not pass through, how can it converge or diverge light?!

4 This is a problem to say, we haven't learned it yet, sorry we can't help with it.

By the way, how did you learn physics? Maybe how did your teacher teach, and still ask such a simple and childish question. This kind of problem does not appear in the exam field in our school at all, because it is too simple.

I'm sorry for saying a few more words.

1。The light spot is a large round spot like a convex lens, and it is impossible to distinguish between the correct and the positive, so it does not matter whether it is virtual or real.

2。The real image can be undertaken by the light screen, but the virtual image light screen cannot be undertaken.

3。No, no, yes, no.

4, U>2F is small and solid, you should pay attention to the lecture when learning mechanics.

I'll just say a little bit, you should read the book for the rest;

The so-called real image means that it is an image made of actual light.

The virtual image, on the other hand, is the image formed by the reverse extension of the actual light.

So when you look in the mirror, it looks like; Virtual image.

<> begging, if you don't know anything, ask me.

It is to multiply the cosine value directly.

Popsicles are liquefied when water vapor in the air meets popsicles (cold).

When water is boiled, the white air emitted from the spout of the kettle is the water vapor in the kettle and the cold and liquefied.

The similarity is that they are both liquefaction.

The difference is that one is that the hot water vapor in the air liquefies when it is cold, and the other is that the hot water vapor in the pot liquefies when it is cold.

Changes in the state of things in life.

Melt. The ice melts in winter.

Coagulation: The water freezes.

Vaporization. The process of boiling water, liquefaction: fogging in the morning in summer.

Sublimation. The hygiene ball is placed in the closet and finally disappears from the process.

Sublimation. The process of ice crystals forming on the glass windows in the harsh winter.

The popsicles taken out of the refrigerator are indeed liquefied by air, but the white gas from the boiling water is vaporized.

In fact, it is the same, it is the physical phenomenon of water vapor liquefaction when it meets cold.

The difference is that the energy released is different, because the temperature of the two white gases is different.

There is a typical example of the phenomenon of condensation in physics: elemental iodine will sublimate when heated and directly turn into iodine vapor; If the steam encounters a cold vessel, it will condense into a solid state.

Another example is that the clothes hanging outside at night in winter will freeze, which can be understood as condensation.

There is a lot of melting, like ice is the easiest, and there are a lot of solidifications such as snow, frost and so on.

The force object of the component force and the resultant force should be the same object.

It should be said that the gravitational force exerted on an object can be decomposed into a force downward along the inclined plane and a force perpendicular to the downward slope. Said to be the pressure on the inclined plane.

The stressed object becomes an inclined plane.

I think so....Maybe it's multiple choices! Orthogonal decomposition can be done perfectly! But I didn't look at your picture, and it wasn't very clear.

It's very divergent, but it definitely won't!!

You need to know the following concepts and formulas of gravitation: (the following two paragraphs are quoted).

Gravitation is an interaction between objects due to the mass they have. Its size is related to the mass of the object and the distance between the two objects. The greater the mass of the object, the greater the gravitational pull between them; The farther apart the objects, the less gravitational pull there is between them.

The gravitational force between two objects that can be regarded as particles can be calculated using the following formula: f gmm r 2, i.e. gravitational force is equal to the gravitational constant multiplied by the product of the masses of the two objects divided by the square of their distance. where g represents the gravitational constant, the value of which is about minus 11 units n·m2 kg2.

It was measured by the British scientist Cavendish through a torsion scale experiment.

Gravity is created by the gravitational pull of the Earth on an object, "as long as the mass of the Earth does not change, the gravitational force does not change". So, the disappearance of the magnetic field does not cancel out the gravitational pull.

However, the disappearance of the magnetic field will expose the earth directly to the radiation of the "solar wind", and a large number of high-energy particles will shoot directly into the earth's interior, causing physical changes in the earth's interior, which will have catastrophic consequences.

No, it is necessary to cut the magnetic inductance line for a long time, and the track of the maglev train is an alternating magnetic field, which will produce an upward force! Gravity is a component of gravity, and they are not the same in nature and will not cancel them out unless you artificially create the conditions.

It's hard to say, but gravity seems to be caused by gravity!!

Theoretically, yes, but you need a magnetic field that is large enough.

Of course it would, otherwise where would the maglev train come.