Saber

Two questions about the doppler effect.......... Does it also apply in reverse ?? i mean a stationary sound source & a mobile observer ( hearer ) And .....does it apply to other forms of waves ? like electromagnetic ones ? or light ??? Thanx .......

I want to thank every one who responds and takes their time to answer but unfortunately .....the reputation system limits the amount of likes i can give...........dont know why ........

By the way this part Made me think a lot about why when two people are attracted to each other @ a certain level of sincerity.........i mean if those two get closer to each other....past a certain level and amount......things start to tense & the situation between them gets somehow not that much .......intimate ......you know what i mean........ These two things maybe dont have anything to do with each other but i see some similarities between them..........iv lost many of my close friends like that and always thought about it.........that when i get close to a person the attraction must be stopped or @ least regulated or it would ruin the friendship.....

Does that mean that the world is a completely different one in the Quantum level ?

if im sitting on a chair that means that im levitating over it ? If im holding a cup in my hand im just holding it in he air with the force of my hands atoms ? When im pulling or pushing objects im just moving them with the force of my atoms and not even touching them ?

So does that mean really nothing touches anything else in the world ? only approaches its limit ?

When two objects touch.............. Do their......toms and molecules..........collide ??? @ the point of their contact ? and some of them are exchanged between the two objects ? Or no the force field around the atoms dont let them to even get near each other ? * near in the atomic scale

I admit im dumber than that to understand it.......haha ........... i mean if i put time and effort....maybe i will but in the country i live and the situation i am now........i have to work ......10 hours a day........really i have not that much of mental energy to put it on that Ill save it and try to put some effort on it later......also for the post @studiot sent for th balloon buoyant from the book..............

Honestly thats more than my understanding capacity to understand it @ once i have to read it a couple of times and concentrate on it.....to grasp it i

when mr Lorentz and you gave me hints i thought that your hints dont line up......but i was afraid to ask......im really confused now......

Does that mean weighs on both sides reach to the bottom/tom simultaneously ? or the opposite of this ? The weighs only can pull right they cant push

Sooo i have to admit i gave up....

So back to the most simplified version ....is it that the pistons have to enter water ( a very denser material ) from air..........and the force needed to go in it from a very lower density to a very higher one ?

So im not on the right path of thinking ?

Thinking in the first situation when it hadnt been simplified............The buckets with membranes i mean......... The buckets @ the bottom experience more pressure in the membranes right ? so the left membranes that protrude out less and the right ones that go inside are pushed more............... So the volumes at the bottom are less = the buoyant force is less. @ the bottom right ? And if we assume that the weigh force of each bucket is 10 for example and the buoyant forces of each bucket in order of size from 1 to 4 is like this then the over all downward force on each one is like this ........ IN that case on the right side as the buckets go down.........they have to accelerate......... and on the left side.....as they travel up they have to decelerate right ??

These days im soooo busy @ work i im left with no energy to think @ all .............but dont tall the answer ill think on it more........

Is the tricky part the section that the pistons reach @ the top & bottom ?

If the buoyant force is more than the W to there would be upward force on the left pistons and downward on the right ones And if the B is less than the W then there would be downward forces on both sides but greater on the right ........ And it seems that in both scenarios the system would rotate CW But still i cant figure out why it would not .....................dont tell it.....give me some time.............i want to see if im intelligent enough to find it out.......

In the cross roads of the old world..............the main conflict ground of human race from the dawn of civilization AKA middle east You know when your worried & anxious your mind really cant think about the things that are not liked directly to its survival........I mean when did humans evolve mentally and started to build & make tools and then start primitive civilizations ? When they reached to a point that they had enough to eat and had some reliable amount of security i mean when they had enough time + energy + free mind.............. In the region i live....the society has not completely covered up that part of the human social evolution......* unfortunately....... And again unfortunately..........there a thing called the ladder of opportunity........And the ones who climb it first would dismantle the stairs as they are not interested in sharing their higher position with others............ and that principle implies and is present in the natural evolution of the creatures also..........you know this natural world doesnt have that much ethics and morals after all........... Never mind i dont wan to derail this thread and these talks belong to some other topic and forums.......... So you mean that W> B or b ? right ? in that case both forces on both sides are downward but the force on the right side is greater as its buoyant force is less but in that case i dont know In that case the forces on the right side is more than the ones on the left side...............and i dont know if they cancel the left forces and then the system would rotate CW or......???? I have to think more to find ou where the .........fishy thing is......................

You know thinking is a little hard in the situation i have ......last night drones came in side my ( Sh*thole ) country and had hit 5 military facilities one near my home about 10Km distance and i think things are gona escalate ........my mind is on survival mode............and i have to force it to think about science..... Let alone the internet is so slow it will grind your gears.......... Trying to concentrate on the topic....... I simplified it like this .......... W= weight of buckets + the weights B = buoyant force of the whole bucket + weigh in the case that the membrane is stretched out and the volume of the bucket is more thus the buoyant force is more b -= Buoyant force of the whole bucket + weigh in the case that the membrane is pushed in..........so the over all volume of the bucket + weight is less thus the buoyant force is less So to simplify it the over all force on the left buckets = W-B lets call it for example A and the one for the right one = W-b and lets call this one for example a but what direction are A & a up or down ? and that depends on .......how much is W ? if W is way much more that the buoyant forces of B and b then the buoyant forces cant cancel it........and so the over all force on both left & right side is downwards and so the system would and could not rotate And if the W is less that the buoyant forces .....and they can cancel W out........again both forces on the R & L would be upwards and again it cant rotate right ? But if B>W>b then the system could probably start to rotate CW right?

Whats inside the buckets ? i man under the membranes ? water or air ? Whats inside the buckets ? i mean under the membranes ? air or water ?

Not sure ..........because if the out side pressure was grater the balloon would not hold its shape ? and deflate ?

Can you read minds from long distances ? Because i was thinking about the very same question in my mind today * not with pencil but with a wooden bar And i thought no .....the buoyant forces must be the same in both cases right ? In the vertical mode the pressure difference is way higher but the area that the pressure is applied to is less In the horizontal mode its vise versa meaning pressure difference is lower but area of that the pressure app,lies to is more

Thank you very much Mr Lorents Reading your post i understood that the Buoyant force is actually originated by the pressure difference between the fluid underneath & above the object Have i understood it right ?

When you push a piece of wood down in the water for example..... the buoyant force pushes it upwards till the piece of wood reaches the surface....... Is that the same force that pushes up a hot air balloon in the air ? I mean are these two forces from a same type ? less dense object submerged in a more dense one ? And if yes whats the source of those forces ? Where does that buoyant force come from and originate ? Thanx.........