material

  1. K

    Dynamics Of Material Point

    i attempted to solve it with energy formulas . but couldn't find a proper solution.
  2. M

    Strength of material!HELP!

    Somebody can help me with this exercise?
  3. M

    Strength of material

    Somebody can help me solve those 2 exercises?please?
  4. timemachine2

    How much does light penetrate through a solid material in microns.

    How much does light penetrate through a solid material in microns. There more than a million atoms in the width of a human hair, so with...light shining on the hair how many single atoms in a line, would the light traverse through, or maybe the better word to use is scatter through. The light...
  5. timemachine2

    I called a few light material physicists, and they said MAYBE it could be possible to

    .... to make a solid opaque element translucent with this light mixing technique. I called a few light material physicists, and they said MAYBE it could be possible to make a solid opaque element translucent with this light mixing technqiue. this light mixing technique. first hit the electron...
  6. timemachine2

    Could combining light, and X-rays together, make opaque material with the least

    How opaque a object is depends on energy of electrons, the BAND structure, not how amorphous it is, or how many electrons the element has. All elements electrons differ in eV to move them from the ground state to shell 2. So if light was combined with X-rays, and the light was either 1...
  7. N

    Material for superheated water

    Hello, I would like to do some experiment with superheated water on several hight temperature deegres (300, 450, 600, 750, 850, 900 °C). There is a problem and I need help. What kind of material could hold pressure of superheated water for a longer period of time (one week)? Please notice...
  8. timemachine2

    How thick does a material have to be to start to become opaque to light?

    How thick does a material have to be to start to become opaque to light? Someone said a atom is transparent to light to me. but as a material get more thicker, either in single atoms, or a micron, electrons start to absorb light, and there is no more transparency How thick does a material...
  9. H

    Is this magnetic field equation correct in material as well?

    Or is it only valid in vacuum condition? Segment of straight wire carrying current I (at distance r) dB = u.Idl x r / 4pi . r^2 (I've came across it on a book about Maxwell's Equations.) Does correction have to be made for polarization or magnetization of the material medium? If so, how?
  10. kelsiu

    Why diamagnetic material is not repelled?

    When an external magnetic field is applied to a diamagnetic materials, their atomic current loops will tend to align in such a way as to oppose the applied field. Diamagnetism is the residual magnetic behavior when materials are neither paramagnetic nor ferromagnetic and most materials are...
  11. Q

    Help required for EMI shielding

    Hi all, I have a few doubts regarding EMF shielding. Could anyone enlighten me? Q1: This question is about cable. Is it the higher impedance of the cable , the better the shielding of it? Q2: cutoff Round waveguide. How much SE(dB) is enough . My project is working on 18GHz . I'm intending to...
  12. T

    Wavelength in material

    This question is a two part question and I have answered the first part, but for the sake of the getting help on the second part I'll put the first. 1. Light passes from material A, which has an index of refraction of 4/3, into material B, which has an index of refraction of 5/4. Find the...
  13. A

    dynamics of material point

    The two blocks shown in the figure are initially at rest. Despise the masses of the pulleys and the friction between different parts of the system. Get (a) the acceleration of each block and (b) the tension in cable. Answer: (a) aA = 2,56 m/s^2; aB = 1,28 m/s^2 (b) 677 N
  14. A

    Material point

    The position of a material point swing is given by x=Asin(Pt+ \phi ). There is the speed and position for coordination of Vo and Xo, shows that tg \phi = \frac{XoP}{Vo} and (b) that the maximum value of the coordinate position is A = \sqrt{(Xo)^2 + \frac{(Vo)^2}{P}}
  15. A

    acceleration of a material point

    The acceleration of a material point is defined by a = - \frac{k}{x}. It was determined experimentally that v = 3m/s when x = 500mm. Get (a) the velocity when x = 750mm and (b) the position of the point to which your velocity is zero
  16. R

    About electricity and reactions

    Very very urgent please help me... A small ball with mass =0,4g charged with electricity= coulomb is united with the edge of a silk rope with length=8cm. The other edge of the rope is on a big insulating material with concentration of the electric energy: . Find the angle between the rope and...