How does wind cause a wind turbine (pictured) to spin? I cant find a good source on google to explain this to me. This question should help me understand better how a turbine is spun in a jet engine.
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The rotor blades of a lift based wind turbine are shaped like airfoils, so the wind flowing around them creates a lift force which in turn moves them around. From a thermodynamic viewpoint and like answered in  kinetic energy is extracted from the wind during this.  But what goes on from a mechanical perspective? How exactly is the kinetic energy of air particles transferred onto the rotor blades via lift? None of the sites I read gave an elaboration on the how.
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One topic which was covered in university, but which I never understood, is how a spinning top "magically" resists the force of gravity. The conservation of energy explanations make sense, but I don't believe that they provide as much insight as a mechanical explanation would.  The  Cedric provided looks similar to a diagram that I saw in my physics textbook. This diagram illustrates precession nicely, but doesn't explain why the top doesn't fall. Since the angular acceleration is always tangential, I would expect that the top should spiral outwards until it falls to the ground. However, the diagram seems to indicate that the top should be precessing in a circle, not a spiral. Another reason I am not satisfied with this explanation is that the calculation is apparently limited to situations where: "the spin angular velocity $\omega$ is much greater than the precession angular velocity $\omega_P$". The calculation gives no explanation of why this is not the case.
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I'm trying to understand at a high level how a  works. I want to know if the following summary I wrote is more or less accurate:  The jet compresses regular air into a combustion chamber. Fuel is sprayed into the combustion chamber. The pressurized fuel/air mixture is ignited and this increases the pressure inside the combustion chamber even more. The hot highly presurized gas blasts out of the combustion chamber. The energy of this blast is captured by turbines. The turbines power the compressor and provide useable power to a shaft.  Is my understanding correct?
83500
How does alternating current get anywhere if it travels "back and forth" in the wire?. I understand that Direct Current is a flow of electrons through a wire, but I have always been confused with how Alternating Current works. I expect I am missing something simple but could anyone point me to a resource that does a good job of explaining AC, or perhaps offer an explanation themselves? Thanks!
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How it this possible? Even if the gif is fake, the Mythbusters did it and with a large sail it really moves forward. What is the explanation?
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What exactly are the spikes, or peaks and valleys, caused by in pictures such as these    Wikipedia states that "From the point of view of magnetic energy, peaks and valleys are energetically favorable", but I'm not exactly sure what that means, or how it works. Why isn't the fluid just happy being attracted to the magnet in a semi-sphere shape? Could it be that it gains a magnetic charge, so it attempts to repel itself at the same time? Just pulling at straws here.
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In a table fan, the blades move around in circular way and we feel air/wind when sitting on front of it. How does this happen?
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Why does a rocket spin during launching?
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In the following image:   Why can't current flow across the following wire? It's a simple question, but I've kind off always wondered.  Thanks!
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So I asked my science teacher how wind could feel colder than normal air when the particles would be moving faster than normal air particles, meaning that they would have more kinetic energy and a higher temperature. My teacher told me that the faster rate of particles hitting your body would mean that the heat would leave faster than in normal air, but I was confused as to why they would take energy.   Eventually, I figured out that the air particles have kinetic energy separate from their velocity and my teacher confirmed this. He also confirmed that the particles would vibrate in place while they are moving.  How is this possible, and how does the vibration dictate the heat transferred, and not the velocity?
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So I was cruising around at YouTube and saw this , and as I was watching started to wonder: "How is this possible?".  For a little bit of background, in case you decide to not watch the video, what is happening is an individual can hook out a 'pack' that sucks up water and then shoots the water downward:    This water Jet Levitation (JetLev) causes the rider to be able to fly upward into the air and move about forward, backward, side-to-side and even underwater (you have to watch the video for that).  So my question is:  How exactly is this possible?
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today i run into another problem. i dont know how i have done it (probably i clicked sth what i should not click) - anyway - since that moment my objects are behaving totally different when i try to rotate them. the objects are now rotating around the pivot point but they keep their alignment - not sure if i am clear. eg. if u would rotate a plane which is lies flat on the ground it makes the rotation but the faces of the plane would still be up and dont which shouldn't be the case with the "normal" rotation that i know. so i want to understand what i have done (because this kind of rotation could be also usefull sometimes for me) and how can i return it in the case it happens again.
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In my book, it is written that "An emf is induced in a loop when the number of magnetic field lines that pass through the loop is changing" (Faraday's law)  I understand that whenever there is a change in magnetic flux, there will an emf induced in a loop and this in turn will induce a current.  However, I really want to understand what exactly goes on to cause this. I just want to check if I am right:   There is a relative movement between the loop and the magnet (e.g. loop moving towards magnet) Thus, electrons in the loop are "moving" relative to the field A moving charge experiences a force perpendicular to the direction of the field As a force is exerted on the electrons, they move in a particular direction Current is induced   I do not know much calculus and studying high school physics but could someone please help me get an intuition behind Faraday's law or tell me if my way of thinking about it is right?
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So I have these two wheels parented to the leg of a robot. I wanna make them spin a few times but they're spinning around the wrong axis. With other objects I could just press R, Y, Y to make them spin right when they're already at an angle, but for some reason it doesn't work with these. Would be amazing if someone helped me fixing this!
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The origin of spin is some what a puzzle to me, everything spin from galaxies to planets to weather to electrons.  Where has all the angular momentum come from? Why is it so natural?  I was also thinking do photons spin? we always think of the wave as a standard 2d sin wave but could this rotate in 3d? What implications would this have?   And what about spacetime how does all the spinning effect?  This has always been avoided in all lectures and classes I ever went to.
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I have setup a project of 250 frames with a flag and a wind force field. It works fine until I change the length of the project to 520 frames, then the flag is frozen after frame 250. There must be a simple way to change this. Thanks for any help. Regards, Daniel.
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What is the direction is the magnetic force vectors pointing from a coil of wire that has current running through it?    The above link is a picture of a wire with current running through it. I see the blue arrows indicating the magnetic field lines, but I am having trouble visualizing the magnetic force lines. Where are they pointing? Please help.