What physics tips do you know?

The bulb will turn black after a long time, this is because there is a substance in the bulb called black silk, which will produce the phenomenon of sublimation after a long time, which is a small knowledge of physics.

The boiling point of water is affected by many conditions, generally speaking, if there is a substance in the solution in the water, then the boiling point of the water will rise, the more substances dissolved, the higher the boiling point, which is why fresh water is opened before salt water.

The physics tip I understand is that when the light bulb turns black, don't worry, because the tungsten filament inside it reaches a high melting point, it will turn black.

The newly bought canned food canned food can't be opened, so the lid of the can can be soaked in hot water can be opened well, which is the use of physical knowledge of thermal expansion and cold contraction.

For example, if the candle is in a state of disappearance at this time, the flame will take on an oval shape.

In junior high school, I once learned that at the moment of hypnotizing the candle, the lighter is lit along the white smoke that comes out, and the white smoke will light the candle again along its track.

Why do long jumpers run a certain distance before taking off?

Answer: Using inertia, the body must maintain the original speed after jumping forward to increase the distance of the long jump, so the athlete runs a certain distance before jumping.

Friends who wear glasses should know that every time you go from outside to indoors in winter, there will be a layer of air to cover your eyes, you can wash the lenses with soapy water and then dry them, and you will not have this kind of trouble in the future.

1. At sunset, after the sun descends from the horizon, the flow of molecules in the air decreases, the temperature begins to decrease, and most animals reduce their activity behavior and enter a state of rest. At the same time, the plant stops photosynthesis and consumes oxygen from the outside world. Sunset marks the beginning of the night and is the end of a day's work life.

2. Sunrise, the time of sunrise will change with the season and the latitude of each place. Traditionally, the winter solstice is believed to be the latest in the Northern Hemisphere, but in fact the latest sunrise is in early January. In the same way, the earliest time of sunrise is not at the time of the summer solstice, but at the beginning of June.

Even in the equatorial region, the sunrise and sunset times change slightly throughout the year. And these changes can be expressed in analemasma.

3. The four seasons alternate, and the four seasons of the year are formed because the earth revolves around the sun. Due to the existence of the yellow-red angle, the annual change of the direct point of the sun moving back and forth between the north and south latitudes of the earth is 23°26, which causes the seasonal change of the height of the sun at noon and the seasonal change of the length of day and night, resulting in the seasonal change of the amount of solar energy obtained in various places, so that the change of the four seasons is formed.

4. The Matthew effect, the phenomenon that the strong get stronger and the weak get weaker, is widely used in the fields of social psychology, education, finance and science. It is a term commonly used by sociologists and economists to reflect the social phenomenon of polarization, where the rich get richer and the poor get poorer.

5. Watch theorem.

It means that having more than two watches does not help people judge the time more accurately, but creates confusion and makes the person looking at the watch lose their judgment of the time. The reason is that everyone can't pick two different codes of conduct or values at the same time, otherwise that person's behavior will be confused.

The above content refers to Encyclopedia-Watch Law.

The above content refers to Encyclopedia-Matthew Effect.

The above content is based on the Encyclopedia - Four Seasons.

The above content refers to Encyclopedia - Sunrise.

The above content refers to Encyclopedia - Sunset.