How to specify a model of superposing 8 wave funtion with the max wavelenght and amplitude?

I have 8 different waves with different amlitudes and different wavelenghts. My difficulty is to specify a mathematical model which defines the superposition of this 8 wave in the way of having maximum amlitude and maximum lenght. I am not a physicist and I have some difficulties in mathematical demonstration. If you could help me, I would be appreciated Best,

Fluid Mechanics -Investigatory project

Hello. I am currently a high school student in South Korea. I was assigned to conduct a physics research project in school, but I really cannot even get started on solving it and I was wondering if you could help me.


The question is: Investigate the various forces involved when you try to separate two sheets of glass separated by a thin layer of water.

So far, I’ve found that two main forces will work to make separating the glass harder. First is the fact that you have to break the bonds within the film of water to separate the two sheets, and the second is that sandwiching water between the two sheets creates a pseudo- vacuum which means that air pressure will be pressing down in all directions, and that is what makes separating them harder.

Any and all help will be appreciated. You could basically send me a few key terms to help me get my research started, or send me the name of a research paper, or suggest ways for me to get an experiment designed.

Thank you in advance! H. Kim


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Energy savings calculation!!

An energy saver light bulb of 11 W gives the same illumination as a conventional 60W light bulb. (a) If a typical light bulb is used on average for five hours a day, how much energy is saved per year by one light-bulb? (b) If each household used eight such light-bulbs, ad there are 20 million households in a country, how much energy would that country save annually?

Asked SNB

led(Answers to this question invited from all users and visitors)

Time dilation and Length contraction

Is time dilation and length contraction hypothetical or is it really an observable fact.

for example,consider a rectangular sheet in a spacecraft moving at some high velocity.

Would an observer in the spacecraft be ever able to see the sheet as a square due to length contraction along its breadth(if the velocity is so so adjusted).
Would a stationary observer in the earth be able to observe the same.
In other words who experiences length contraction?

Also who experiences time dilation?

 

relativityAsked Ajmal

Friction – Numerical Problem

A block of mass 1 kg lies on a horizontal surface in a truck . The coefficient of static friction between the block and the surface is 0.6 .if the acceleration of the truct is 5m/s² calculate the frictional force acting on the block.

motion_friction1_240Asked  Mrinmoy Das

Helmholtz theorem

What is Helmholtz theorem?? Use it to show only transverse component of current density exist in wave equation??

Yuvrajj Vatt asked

 

Please refer to https://en.wikipedia.org/wiki/Helmholtz_theorem_(classical_mechanics)

http://farside.ph.utexas.edu/teaching/em/lectures/node37.html

http://www2.ph.ed.ac.uk/~rhorsley/SI09-10_t+f/lec19.pdf

http://mathworld.wolfram.com/HelmholtzsTheorem.html

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