# Tag Info

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The shape of the spout of your milk jug makes the milk from the edges flow towards the center - but as this means that the profile is trying to get narrower, the milk "has to go somewhere" and makes the jet wider in the other direction. However, surface tension is pulling back on the liquid (it would prefer the jet to be a perfect circle) so the liquid ...

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Test data shows that pressure on ground is calculated by dividing the weight of car divided by 4 then divided by patch area which will always be much less that the interior tire pressure. Test data shows that when the load is doubled the patch area only increases by 25%. e.g. under a 1000 pound load on tire the patch area is 100 sq.in while for a 2000 ...

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Tractors commonly have larger rear wheels for several reasons. One of these reasons is weight distribution. The larger the rear wheels, the further the wheel will have to sink into the ground to become stuck, which, on the common automobile, is a little over halfway between the center of the rim (wheel), and the contact point to the ground. This is the point ...

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Paper is made of many, many tiny fibers. When you wet a piece of paper, those fibers absorb water and swell up. As they dry, the relaxed fibers don't go back to exactly where they started. Some will have shifted or "untangled", moving out of the plane of the original paper. So yes, the paper actually does become slightly bigger because the fibers have ...

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My understanding is this. I invite a discussion on this answer. While pouring the milk from the glass, Lets say "N" milk-molecules is reaching the air in the open space say "S". As the milk is more viscous fluid the milk-molecules are interested in coming as close to each other and hence it converges and hence the space in which the milk travels is reduced ...

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The air in the freezer is a poor conductor of heat. The greater surface area of the porous paper along with its heat conducting water allows it to act as a heat sinc. It transfers heat from the liquid to the glass or aluminium and then to the water in the paper which sheds the energy by conducting it to the surrounding materials such as the air and the ...

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Excitation is due to interaction (exchange of momentum, changes of volume and force) of the droplets with the liquid surface. The air volume in the bottle has its own characteristic response which emphasizes particular frequencies of the excitation. During filling, the air volume decreases and small things tend to vibrate more at higher frequencies. A small ...

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The LCD panel consists of elements shown in the figure below. The unpolarized light from backlight panel travels through polarizer, after which the light is linearly polarized. TFT panel controls the voltage on the liquid crystal, voltage applied will cause the liquid crystals to "twist" and thus rotate the polarization of the light. Light then passes the ...

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i don't think it has anything to do with quiteness, a typical surburban area, the noise difference during day and night ain't that great to mask train horn (which is pretty loud). It's the air temperature at work. In the daytime the ground air is warm, bends airwaves upwards so for certain distance, you ain't gonna hear any sound at all, but during the ...

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To get the ice cube to twirl by pure twirling of the glass, there need to be viscous stresses applied to the ice cube from the spinning water. To simplify matters, lets say that the water in your glass is perfectly still before you start twirling, that the ice cube is away from the edge of the glass, and that the twirling is initiated smoothly so that ...

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A domestic humidity meter like this one currently sitting on my desk: measures relative humidity. Relative humidity is the water concentration as a percentage of the maximum concentration. But the maximum concentration is a function of temperature, so for a given amount of water in the air the relative humidity is also a function of temperature. In my ...

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Well there is a huge difference between these two things. As you mentioned temperature is the movement of atoms and describes, on average, how fast molecules and atoms are moving about. The movement can be transferred through any surface because it is energy! Though some objects might transfer heat very slowly, nonetheless the transfer occurs. Hence when ...

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We would expect the screen to display bright images as dark (and vice versa) as one of the polarisers has changed 90degs

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Let us make an mental experiment. Suppose that there is no friction between the glass and the water inside. In this case, if you rotate the glass, the water inside and the ice cube will just stay still. This is because the angular momentum of the water and of the ice cube is conserved, since in this case no torque is applied to the water, i.e., there is no ...

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If the liquid were really rotating in the glass, the ice cubes would rotate with it. What you are (probably) seeing is the superposition of two perpendicular resonant waves sloshing back and forth, but not rotating. Here is how it works: Imagine that, instead of moving the glass in a circle, you just move it back and forth in an east/west direction. This ...

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In short, the movement of an ice cube in water lags relative to the movement of the container because the ice cube's viscosity is sharply higher than that of the surrounding water. The effects of inertia might be more easily imagined by simplifying the components to a slowly-melting ice cube sitting on a smooth/flat platter. If the platter is slid briskly ...

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Gore-tex is very porous. This lets water vapor (and air) out, but the pores are not large enough to let liquid water in. The reason water cannot go through the pores is because they are only 1 micrometer larges. So, water vapor can diffuse through but water in liquid form cannot pass through. source 1 and source 2.

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When a vehicle moves through a gas or a liquid, it displaces the medium through which it moves, and gas or liquid must rush in to fill the void of displacement. It's exactly like the bow wave of a ship which must fill the area immediately behind the ship. This creates suction past the mid point and toward the stern of the ship. I'm certain that you feel ...

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It all has to do with velocities and pressure between the two vehicles. So, in principle, it has to do with Bernoulli. The two vehicles drag air with them, so between them you will have an area of higher fluid velocity than the area to the left and right of each vehicle respectively. To explain more plainly, between the two vehicles you will have dragged ...

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No, not at all. it doesn't have anything to do with gravity. the mass of the cars are very very small that you can't even think of the gravity between them. there is gravity, but it is about zero. and one guy answered with pressure. it's not that too. yeah if you put two piece of papers against each other and blow in the middle of them, the papers look like ...

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Your assertion that spinning the glass causes the liquid in it to also spin may contain only a grain of truth and a lot of optical illusion. It is extremely difficult to see the motion of water or even just the exact position of its surface; especially with calm water, this is a frequent cause of misjudged landings for pilots of sea or amphibious planes. ...

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If the coffee is cold enough then it will make a layer of whipped cream, which is basically a mixture of sugar and coffee. The thing is that the layer becomes sticky at the surface while the coffee is liquid beneath and flows in the lower layer. The liquid flows because the lower layer is not dry enough and sticks at the surface to resist the liquid layer ...

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layman, It takes more PSI to suspend a heavier load with equal square inches. Or the same PSI with more square inches. Rubber tires will mostly just flex to give more square inches. Foot print of tires x psi = weight of car

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For the record, it might be a partially blown head gasket letting water flow from the coolant channels, into the combustion chambers, and out the exhaust. A lot of water flowing out of the exhaust isn't normal.

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If you want to smash another person's egg, you simply need a firm grip around the base of the egg (the wide end) and attack with the narrow end of the egg pointed at the other person's egg. The science behind this is the physics of pressure $$P=F/A$$ P for pressure, F for force and A for area. When the narrow end of your egg hits the side of another egg 2 ...

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Well, it doesn't burn faster. I would say it burns slower but tans faster. Thats how dark tan oils work. The melanin absorbs the energy from the sun to charge and store it. The body wants more and produces more melanin. So you would get dark. However I believe the water on the skin just intensifies the energy, not the burning uv ray itself. Therefore, I ...

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1) The $sin$ term appears to be resolving the velocity of the water relative to the face of the disk. $U$ is the just the speed, it's necessary to determine what part of that velocity will produce force on the object. It might help to visualize extreme cases, setting $\alpha$ and $\beta$ to 0, $\pi /2$ etc. For $\alpha = \beta =0$ you have a perfectly level ...

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