Science Quiz
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So cool!
I knew cats purr'd when they were ill or scared! That's interesting that it's a healing mechanism!!!
I remember learning this.
This video is SO awesome and makes me very happy. That is an awesome dad. I'm actually a little teary.
This is the right answer!
The peach is less sweet because there is more water. Also, the peach would be greater in size!
Here are some more from their archive!
1. When children blow bubbles, why are they always spherical?
2. How do cats purr?
3. When Mount St Helens erupted, the explosion was equivalent to millions of tonnes of explosives. Yet, the noise was not heard within 100k of the volcano. Why not?
4. How do ducks stay warm?
I know the answers to these...but these two don't have the answers posted! So guess away if you like
a. If you run a tap, and put an object in the sink near the flowing water, the stream will migrate to, and eventually over, the object. Why?
b. How is it that water can drop below the freezing point and not freeze?
1. The bubbles are spherical because the pressure inside the soap is the same as the atmospheric pressure outside it, and it is the same at every point so the curvature is uniform.
2. Cats purr when air escapes through their vocal folks and oscillates, which causes a vibration. That sound is actually too low for us to hear, but the movement causes other parts of their throats to vibrate, and that produces the sound that we hear.
3. When the explosion happened, the material blowing out compressed the air and moved it upwards, so there was a sound but people couldn't hear it. Then the compression waves regrouped and came back down more slowly and created a sound that was audible.
4. Bird feathers have millions of tiny structures called barbs and barbules. These structures lock together to form millions of tiny spaces. Suface tension causes tiny drops of water to stick to these structures and trap air inside the tiny spaces in the feathers. Because the air is trapped inside the feathers, no more water can get in. The air in the feathers keep the duck afloat AND insulate it against the cold.
Hey seriously no one knows how cats purr. Its still a mystery. Some even think their heart may be doing it.
http://www.livescience.com/32286-how-do-cats-purr.html
http://mentalfloss.com/article/12312/how-do-cats-purr
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add a ton of salt... make the solution more dense.
Peach: bah, the question gave the distinct impression of NO sugar, not diminished. I was barking up the wrong tree the whole time.
Volcano: waves of energy bend around objects and do all sorts of things. Spraying the energy up is all fine and dandy but it will NEVER sequester in an upward cone. The ground all the way around will get a piece of that. Now i'm inclined to believe the energy that hit the ground didn't osculate in an audible range. We might not of heard it but it's possible other species did.
I believe the volcano response is a simplified version of what the Oregon Museum of Science and Industry have found ( http://pubs.usgs.gov/gip/msh/lateral.html ):
Interesting! I should have listen to the actual answer, as he may have said that it's not 'known' just speculated!
Also...I don't know how he comes up with all these questions!
Sounds to me like "Bob" is creating the world to be what he "wants" and not by whats "real". Tell "Bob" I have my eye on him. Well not really, just in spirit.
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Now that is a curious bit of physics! How cool is that! =)
Gratz to [MENTION=6917]sprinkles[/MENTION] for having the answer that most closely matched theirs!
Still, it looks like I wasn't entirely off.
Sounds to me like "Bob" is creating the world to be what he "wants" and not by whats "real". Tell "Bob" I have my eye on him. Well not really, just in spirit.
YOU TAKE THAT BACK!!!
BOB WOULD NEVER DO SUCH A THING!!!
How dare you taint Bob's name! HOW DARE YOU!!!
I'll claim not far off on a few. =) Didn't even try with purring. lol Had no clue. Thought is was different from vocalization. Apparently, that's where it originates from. Was wrong about peach... I'm not doing too bad. :hippie:
Ah, well I knew air movement had to be involved but it was still a guess as to how it was involved. I didn't actually know how it worked.
My conclusion is somewhat logical in a very general sense but it was missing a lot. The blast wave where air is moving faster than sound lasts only a very short time, milliseconds, before the extended shockwave takes effect. A blast wave is a shock wave but not all shock waves are blast waves. The blast wave is the actual explosive force that initially happens which pushes the air faster than sound, but this dissipates so quickly that it ususally does not disturb sound all that much. Normally in air the explosion sound simply goes BANG so there had to be more reasons.
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