You gave me the image of the clever grandpa or uncle I always wanted to have who fascinates his grandchildren, nephews and nieces about the basic laws of nature, the stars, etc... With a reliable knowledge where even their teachers in school can have a lesson from... And that impression is great!! Your (grand)children, if you have them, are blessed with such a teacher in life.
What this method measures is the VOLUME. You calculate mass by multiplying volume and density. Two different bricks of metal may have the same volume (and this method will show it) despite that they might have different densities (and therefore different masses).
You need a material that will preserve its volume when evacuated. And this is a broad topic of material science. You would need a material strong enough to sustain high vacuum volume and light enough to actually float. Google for "vacuum balloon" - it gives some interesting links.
It's not the pressure inside balloon that makes it fly, but its overall mass that displaces air. Making something inside of a balloon (usually a gas) hotter just means that its density will decrease thus reducing the mass of the interior. The balloon with vacuum inside was only an example (it would inflate). But the point is that the buoyancy is dependent on the mass inside a container. It's explained here: en . wikipedia . org/wiki/Buoyancy#Density (remove all 4 spaces between the 2 dots).
Assuming that a balloon would survive such flight, it would rise as long as its mass would be less than the mass of the particles it displaces around (for example: air in the lower atmosphere). It would reach equilibrium at some height and then stop rising. The substance it's filled with would only affect its final height (with vacuum giving the best result). Hard to tell right away what composition would give what final height, but you get the idea, I hope ^^
The buoyant force acting on an object completely submerged in water equals the weight of the displaced water. In this example the volume of the displaced water equals the volume of the brick. Both the gold and iron bricks will experience the same buoyant force (assuming they are the same volume). The net force down (force of gravity - buoyant force) acting on the gold block will be greater because it is denser, therefore heavier, then the iron brick). .....
Block has a force down called weight. The weight of the "displaced" water must equal the block for it to float. The displaced water is effectively pushing against the block to retain the space from which it was displaced. This results inan upwardly force called buoyancy. As the block is much less dense than the water then only part of the box will sink ie the volume of the block which equals the same weight as the water. Example water = 1g/cm3 box 0.25g/cm3 1/4of the block will sink
Because the block is less dense than the water it sits in. Density = Mass/Volume Thus, Mass=Density(Volume). The weight of the volume of water displaced by the block equals the weight of the block. Since the block is less dense than the water a smaller volume of water has more mass than an equal volume of the block. Since only half the block submerged this suggests that the block is half as dense as the water.
AFAIK, the buoyant force would be the same. Although the hollow thin shell brick requires much less force to push it upwards (therefore it floats). You need to manually sink it and then it will push the required amount of water (as presented in the video).
Ah. So and the significance of the name Archimedes makes this ever so relevant. But I gotta say this is though basic chemistry, its applications are useful when extended to nautical engineering. Also, I have to admit that I came across this video after watching "Meet the Medic", which have no relevance to science but in particular mad science! LOL! And video games.
in archimedes' time, the king ordered someone to make a crown from a brick of gold. then the crown is made and when they check it, the mass of a standard brick of gold is equal to the mass of the crown. but archimedes doubt that the crown is not made of pure gold. in the end, he placed both objects, the brick and the crown, in a container with the same amount of water. the crown displaces more water than the gold. i thought that the mass of an object is equal to the mass of water displaced.
i don't get it-shudn't the weight of displaced fluid, when you put the stone on the block, be equal to the sum of the weights of block and the stone? how come the weight of displaced fluid equal to just the weight of the stone?
weight of the body immersed in water=buoyant force...then y do some objects (like needles n paper etc) sink in water??they should remain in equilibrium if their weight=buoyant force.......
In fact, i'm not understand this pirinciple thoroughly. My question: The actual weight of an object is 12N. The apparent weight of the object when it is immersed in water is 9N. What is the density of the object? Can anyone help me to solve this question??? Thanks.
You gave me the image of the clever grandpa or uncle I always wanted to have who fascinates his grandchildren, nephews and nieces about the basic laws of nature, the stars, etc... With a reliable knowledge where even their teachers in school can have a lesson from... And that impression is great!!
Your (grand)children, if you have them, are blessed with such a teacher in life.
It would've been great having these videos when I was in school back in the 80's!!
Another great video.
What this method measures is the VOLUME. You calculate mass by multiplying volume and density. Two different bricks of metal may have the same volume (and this method will show it) despite that they might have different densities (and therefore different masses).
I'm in grade 8, and i have a test coming up about this. but it was too much info, but fun to learn! i totally get it, and now im ready! thanks!
Placing the brick on floating wood displaces a weight of water equal to the weight of the brick.
You need a material that will preserve its volume when evacuated. And this is a broad topic of material science. You would need a material strong enough to sustain high vacuum volume and light enough to actually float. Google for "vacuum balloon" - it gives some interesting links.
It's not the pressure inside balloon that makes it fly, but its overall mass that displaces air. Making something inside of a balloon (usually a gas) hotter just means that its density will decrease thus reducing the mass of the interior. The balloon with vacuum inside was only an example (it would inflate). But the point is that the buoyancy is dependent on the mass inside a container. It's explained here: en . wikipedia . org/wiki/Buoyancy#Density (remove all 4 spaces between the 2 dots).
Assuming that a balloon would survive such flight, it would rise as long as its mass would be less than the mass of the particles it displaces around (for example: air in the lower atmosphere). It would reach equilibrium at some height and then stop rising. The substance it's filled with would only affect its final height (with vacuum giving the best result). Hard to tell right away what composition would give what final height, but you get the idea, I hope ^^
I did it!! I'm best, I'm genius! Or... I guess it wasn't that hard... ;)
Great video, Hilaroad!
The buoyant force acting on an object completely submerged in water equals the weight of the displaced water. In this example the volume of the displaced water equals the volume of the brick.
Both the gold and iron bricks will experience the same buoyant force (assuming they are the same volume). The net force down (force of gravity - buoyant force) acting on the gold block will be greater because it is denser, therefore heavier, then the iron brick). .....
Excellent lessons !!!
Block has a force down called weight.
The weight of the "displaced" water must equal the block for it to float. The displaced water is effectively pushing against the block to retain the space from which it was displaced. This results inan upwardly force called buoyancy.
As the block is much less dense than the water then only part of the box will sink ie the volume of the block which equals the same weight as the water.
Example
water = 1g/cm3
box 0.25g/cm3
1/4of the block will sink
Yes, but you might have to push and hold the hollow one under water. This happens when the buoyant force exceeds the weight of the object.
Because the block is less dense than the water it sits in.
Density = Mass/Volume
Thus,
Mass=Density(Volume).
The weight of the volume of water displaced by the block equals the weight of the block. Since the block is less dense than the water a smaller volume of water has more mass than an equal volume of the block. Since only half the block submerged this suggests that the block is half as dense as the water.
good and well detailed video, this helped me with my project thanks!
AFAIK, the buoyant force would be the same. Although the hollow thin shell brick requires much less force to push it upwards (therefore it floats). You need to manually sink it and then it will push the required amount of water (as presented in the video).
Great Videos...
Ah. So and the significance of the name Archimedes makes this ever so relevant.
But I gotta say this is though basic chemistry, its applications are useful when extended to nautical engineering. Also, I have to admit that I came across this video after watching "Meet the Medic", which have no relevance to science but in particular mad science! LOL! And video games.
Thanks man. Nice video
Please make more explaining videos abaut physics (mechanics).
Now i understand it, very good vid. Thanks
in archimedes' time, the king ordered someone to make a crown from a brick of gold. then the crown is made and when they check it, the mass of a standard brick of gold is equal to the mass of the crown. but archimedes doubt that the crown is not made of pure gold. in the end, he placed both objects, the brick and the crown, in a container with the same amount of water. the crown displaces more water than the gold. i thought that the mass of an object is equal to the mass of water displaced.
Very good!
i don't get it-shudn't the weight of displaced fluid, when you put the stone on the block, be equal to the sum of the weights of block and the stone? how come the weight of displaced fluid equal to just the weight of the stone?
Fantastic vid .. thts wonderful !
this is the wealth of Greece!
cool vids, thank you
this guys voice is so relaxing lol
great video
Bravo!
weight of the body immersed in water=buoyant force...then y do some objects
(like needles n paper etc) sink in water??they should remain in equilibrium if their weight=buoyant force.......
thats a big horse!
Which direction would a helium filled ballon travel inside the space shuttle?
oh and thx for the vid , realy interesting like always :D
In fact, i'm not understand this pirinciple thoroughly.
My question: The actual weight of an object is 12N. The apparent weight of the object when it is immersed in water is 9N. What is the density of the object?
Can anyone help me to solve this question??? Thanks.
prety good
1,600 lbs?
It would DEFLATE, I meant.
yup 1587 lbs
i no 1 part of my exam im not failing...
!!!!
that horse is overweight....