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Anonymous users2024-02-12After blowing the balloon bigger, pinch the mouthpiece with your hand, and then suddenly let go, the air flow inside the balloon is ejected, and the balloon moves due to recoil. You can see the twists and turns of the balloon's movement. There are two reasons for this:
First, the thickness and tension of the balloon are uneven, so that when the balloon is deflated, it shrinks unevenly and swings, so that the direction of movement changes constantly; The second is that the shape of the balloon is constantly changing in the process of contraction, so the airflow velocity at the surface of the balloon is also constantly changing during the movement, according to the principle of fluid mechanics, the flow velocity is large, the pressure is small, so the pressure of the air on the surface of the balloon is also constantly changing, and the balloon swings because of this, so that the direction of motion is constantly changing.
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Anonymous users2024-02-11The 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, and the uneven silver-plated surface or 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.
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Anonymous users2024-02-10Frozen 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.
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Anonymous users2024-02-09When the pot contains 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 do not boil until it is boiled dry, this is because the water droplets, the pot and the water in the pot maintain heat conduction, and the temperature is about the same, as long as the water in the pot is not boiling, the water droplets will not boil, and the water droplets are gradually boiled dry by evaporation on the flame.
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Anonymous users2024-02-08Pour the syrup, water and oil into a tall glass along the tablespoon and the liquid will be divided into three layers; Because syrup, water, and oil have different densities, the less dense always floats on top of the denser. Dip the two suction cups in water, face them directly and squeeze them together, and then pull them hard, with a lot of force it is difficult to pull them apart; Because of the presence of atmospheric pressure.
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Anonymous users2024-02-07Quartz clocks hanging on the wall tend to stop at the "9" position on the dial when the battery runs out of power and stops moving. This is due to the fact that the second hand is most hindered by the gravitational moment at the "9" position.
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Anonymous users2024-02-06Sometimes there is an occasional sound when the water pipe discharges water from a nearby tap. This is due to the resonance of the water pipes caused by the water flushing out of the faucet.
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Anonymous users2024-02-05When 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.
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Anonymous users2024-02-04There are black things around the light bulbs in the house
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Anonymous users2024-02-03The hard-boiled egg is rotated flat on the table and will stand up at the end! (Aerodynamic shape of the eggshell).
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Anonymous users2024-02-021. Pour the syrup, water and oil into the tall glass along the tablespoon, and the liquid will be divided into three layers; Because syrup, water, and oil have different densities, the less dense always floats on top of the denser.
2. Dip the two suction cups in water, face them and squeeze them together, and then pull them hard, but it is difficult to pull them apart with a lot of force; Because of the presence of atmospheric pressure.
There is no single answer to this question, as long as it is reasonable
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