Tag Info

Hot answers tagged

9

Fill a garden hose with water. Hold both ends closed, and walk to the "higher" pond. Have someone helping you hold the end of the hose under water. Now walk to the other pond (still holding the end of the hose shut). Hold the hose near the surface of the pond - you should feel water pressing against your finger. Make a very small opening and observe the ...


6

You don't say what the ash is from, but fine ash is a flocculate of very small particles. As such, it has a very low density with air entrained within it. When you add water the capillary forces produced by the water collapse the structure and expel the air trapped within it. The emerging air carries particles of the ash, hence you see puffs of ash as you ...


4

Several things happen with ripples. First - they are comprised of different wavelengths. That may be hard to explain in plain English, but basically the only way that a wave can have a single wavelength is when it goes on for all infinity. A short "wave packet" must contain different wavelengths. Next - the speed of propagation of these different ...


3

Sewage drains in houses should always have a "vent stack" - piping which extends up through the roof. The vent portion of the sewage plumbing has two purposes: to allow gases in the system to escape, and to provide a "suction break" so that traps (U-bends) don't have their contents sucked out when the pipe fills with flowing water (the water in a trap is ...


2

Water stops draining from the jar into the dispenser once it forms an interface as draining of more water would result into the formation of a vacuum in the jar because no air can rush into the jar to displace the water as it has an interfacial-lock. Consider the water level above interface $= h$, water level below interface $= x$ now $$P_{surface}= ...


2

To answer your questions, would a 90 degree shot turn the ship, in theory yes, due to the conservation of angular momentum law. As long as the cannon was not exactly amidships , in which case it would push, or more probably just cause a list, to port or starboard. And would a 180 degree shot (aftwards) increase the speed of the ship, again, in theory ...


2

I did a little reading and my understanding is that explosions underwater at the same distance as one in air will be much more destructive. Water is a much denser medium than air allowing for the shockwaves to propagate faster. The initial shockwave will be followed by a blast of water, again delivering more force than a blast of air. An interesting ...


2

Contrary to popular misconception, below a specific temperature, glasses do not flow. At all. A glass by definition is a solid sans repeating crystalline structure. Anything which flows (see "pitch-drop experiment which drops every 80 (or something) years") is a liquid, however viscous. Liquid glasses tend to have reasonably high viscosity, but once ...


2

If you drop a bottle without any residual motion (that is, it is not spinning etc) then everything inside that bottle will be in "free fall". The air and the water will attempt to fall at the same rate. There is a nice video of what happens to water when it "spills" in the International Space Station: it becomes a "blob" because of the surface tension. Add ...


2

The reasons you are looking for (why it doesn't work) are twofold: First, mass. Bullets are made out of lead, tungsten, depleted uranium etc. Heavy stuff. Aluminum and brass would make perfectly good ammunition if they weren't so light (or if the shootout was on the moon). The problem is lighter projectiles are greatly affected by air resistance and lose ...


1

Looking up "what happens when lightning strikes a house" on google (it is a .php file so I had to use printscreen) See also this youtube video. So yes, avoid taking a bath during a close by storm. Have a look at this answer What will happen when lightning strikes on the surface of the deep sea? which has some numbers of the energy in a strike. By the ...


1

I think nothing. Example #1: Calculate the rms speed of an oxygen gas molecule, O2, at 31.0 °C Solution: $v=\sqrt{\frac{3RT}{M}}=\sqrt{\frac{3 \times 8.31447 \times 304.0}{0.0319988}}=486.8 m/s$ That is pretty high average speed of oxygen molecules. The acceleration of the bottle does not change it much at beginning. The direction of molecules motion is ...


1

Tricky with a typical explosive propelled bullet but if you have a compressed air gun handy then it's quite easy. It is even the subject of a long lived Urban Legend


1

It's not feasible, this was tested by the MythBusters (assuming that a frozen blood bullet would be similar to an ice/meat one): http://mythbustersresults.com/episode1


1

When plastic bottles are made they start with something that looks like a test tube with the threaded top for the bottle cap. It's heated and air is blown into it while it sits in a bottle shaped mold. Then it's quickly cooled to lock the plastic into that shape. The stretching creates residual stress in the plastic. It wants to un-stretch like a taught ...


1

I tested it against a control and it worked. Used longneck glass bottles. Didn't measure the difference but the difference was notable to the touch after half an hour.


1

This phenomenon is due to the presence of air bubbles in the water. First note that the solubility of air in water decreases as temperature increases. Therefore when water is heated, less air can be dissolved in the water and when the water leaves the highly pressurized pipes, the air within the water is able to form bubbles and escape into the surrounding ...


1

If you place water (or other material) in a pressure-tight container, the water will change as heat and pressure cause its molecules to become more or less energetic and the bonds among its molecules to become more or less stable, or begin breaking apart. These changes are summarized in a chart called a phase diagram. Here is a simple phase diagram for ...


1

The bond that holds water as a liquid is a simple static electricity bond. it has a strength and will 'break' with sufficient energy. this happens all the time. water evaporates, when a random chance of circumstances through thermal agitation and exterior pressure are at the right amount the molecule leaves the liquid and goes flying off as a gas. the higher ...


1

I have done some builded shots with Vodka and Ice in a -18 C degrees. And because I don't have fotos or links, I just tell you how it goes; 1. Put a bit water on a shot glas and let it freeze. -18 C 2. Put -18 C Vodka (I actually used Amaro del Capo) in the glass above the ice. -Let it stay. What happens? First, the vodka melts the ice and forms a snow ...



Only top voted, non community-wiki answers of a minimum length are eligible