Explain everyday phenomena with physical knowledge, and what are the physical phenomena and their ex

Three forms of water. Ice: solid; Water. Rain: liquid; Water vapor: gaseous. Look:)

There are physics textbooks in junior high school...

As follows:

1. When the quartz clock hanging on the wall runs out of energy and stops moving, its second hand often stops at the position of "9" on the dial.

This is due to the fact that the second hand is most hindered by the gravitational moment at the position of "9".

2. Sometimes, when the water pipe is discharged from the adjacent faucet, there is an occasional bursting sound.

This is due to the resonance of the water pipes caused by the water flushing out of the faucet.

3. When taking pictures of the TV screen, the camera flash and indoor lighting should be turned off, so that the ** picture is clearer.

Because the reflected light from the flash and lighting on the TV screen can interfere with the transmitted light of the TV picture.

4. Frozen pork thaws faster in water than in air at the same temperature. Scalding nails cool down faster in water than in air of the same temperature. A cup filled with piping hot boiling water cools down faster when immersed in water than in air at the same temperature.

All these phenomena show that water has better heat transfer than air.

5. When the pot is filled with cold water, the water droplets attached to the outer surface of the bottom of the pot can be boiled dry on the flame for a long time, and it will not boil until it is boiled dry.

This is due to the fact that the water droplets, the pot and the water in the pot maintain heat conduction at about the same temperature, as long as the water in the pot is not boiling, the water droplets will not boil, and the water droplets are gradually dried up by evaporation on the flame.

6. The distorted mirror, the farther away the person is from the mirror, the more distorted it is.

Because the image in the mirror is formed by the reflection of the silver-plated surface behind the mirror, the uneven silver-plated surface or the uneven thickness of the glass will produce distortion. The farther away from the mirror, the greater the deviation from the normal position of the reflected light on the silver-plated surface by the principle of light amplification, and the more out of shape the mirror is.

7. There are several small holes on the side of the nozzle of the natural gas furnace that communicate with the outside world, but the natural gas will not be sprayed out from the side holes, only from the nozzle.

This is due to the large gas velocity of the natural gas at the nozzle, according to the principle of fluid mechanics, the flow velocity is large, the pressure is small, and the surface pressure of the air flow is less than the atmospheric pressure outside the side hole, so the natural gas will not be ejected through the small hole on the side of the nozzle.

1. The mothballs are missing - sublimation.

2. Brake fall - inertia.

3. Water flows to a lower place - gravitational attraction.

4. Feeling pain when falling to the ground - action and reaction force.

5. Sprinkle salt on the road - lower the melting point of snow.

6. Chopsticks are broken when placed in water - the refraction of light.

7. Figure skating - conservation of angular momentum.

Physics] [Liquefaction, Sublimation and Condensation] - The lower temperature of gas liquefaction.