I have a geophysics exam tomorrow, this question will be intheexam!!! I don't know what the teacher is asking..pleasehellllp!

Inertial navigation systems on aircradt share acommonattribute with the human ear. One measures the timederivative ofthe other. Explain the principles of optic fiber andfluid methodsrotation measurement?

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The question that I have is a Physical Science question,and I wanted to know what the word is for a measurement sign that kinda looks like a cursive p ,and a cursive u put together, but without a circle on top. I can't of any other way to explain better. Please answer my question, because I don't have a clue of what sign this is.

A student makes a short electromagnet by winding 100 turns of wirearound a wooden cylinder of diameter d = 2.0 cm. The coil isconnected to a battery producing a current of 2.0 A in thewire.
(a) What is the magnetic moment of this device?
______ AÂ·m2

(b) At what axial distance z d will the magnetic field of thisdipole have the magnitude 5.0 ÂµT (approximately one-tenth that ofEarth's magnetic field)?
_______cm

Thanks for the help, feel free to check out my other Physicsquestions on this topic, I have another exam tomorrow so the helpwould be greatly appreciated!

I have three air carts on frictionless track that have masses fromleft to right of 4m, 2m, and m, respectively. The most massive carthas an initial speed of Vo. the other two carts are at restinitially. all carts have spring bumpers that give elasticcollisions. Find the final speed of each cart.

My question is, it doesn't seem like I have enough info to answerthis question. I am having a hard time computing what the finalspeed is for each cart when I don't know what the Vo is for the 4mcart that moves to hit the other two carts. I think I am making itmore difficult then it needs to be and realize there is somethingto the fact that each cart is twice the mass of the one previousand how this affects the collision of the objects. Any help wouldbe GREAT!!!

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