Physics 19 Mechanical Waves (5 of 21) Finding the Wave Eq. (when t=0)

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In this video I will explain and develop equation 1 of the (wave train) wave equation.

[@rishisolanki783]

after having taken 2 calculus courses and 3 physics courses, I say that I would not have understood things half as well without your channel. The way you start with the basics, and gradually work up the difficulty with EXAMPLES ensures I never get lost and really helps us grasp the concept. Even though the video is almost a decade old, you are helping many, many students and I wish part of my tuition could go to you. I could take all my physics classes with just your videos and without my professors.

[@MichelvanBiezen]

We appreciate your comment. All the best.

[@MichelvanBiezen]

Amir, Thank you for the comment. I am glad this is helping hard working students like yourself around the world.

[@Lilianaxc]

I thought i'd never say this, but I am beginning to really enjoy physics! (says the girl who dropped the course bc she couldn't conceptualize kinematics) I wish I could pay you instead of my school. You are brilliant!

[@MichelvanBiezen]

Liliana, Thanks for sharing this. Physics can be really fun when it is presented in a way that it relates to everyday life and experiences. (I dropped a few physics courses myself in my college days, so don't let that stop you. Perseverance over the long haul is what counts).

[@MichelvanBiezen]

Apple BS Take a look at the drawing on the white board. We placed x at place where the wave has its maximum amplitude which mean x = wavelength (in that case)

[@AppleBS11]

+Michel van Biezen Oh, I made a mistake, I thought the scale on the X-axis is pi. Anyway, thank you very much.

[@RealationGames]

Excellent way to teach by solving the problem yourself. This video gave me really in-depth intuitive sense of the wave equation. Thank you so much!

[@Peter_1986]

This is exactly how math and physics should be taught - by showing how things were derived and figured out, and what it all means. Most people I know who have been intimidated by math have just relied on ready-to-use formulas without knowing where they came from. Formulas are certainly a very convenient way to quickly calculate something, but they should only be used after you have developed an intuition for them.

[@BorgMater]

You, my dear sir, are a god of knowledge. Infinite thanks for helping me pass my college exam.

[@MichelvanBiezen]

Borgmaster, It is good to read that these videos are helping students around the world achieve success with their studies, but in the end it all comes down to hard work on the student's part. Congratulations and thanks for the feedback.

[@11parham]

you didn't say "welcome to ilecture online"

[@MichelvanBiezen]

+Parham Soozandeh HaHa, that was funny.

[@rishisolanki783]

always my favorite part of every video

[@amirmeysami7868]

Thank you very much for doing this, your teaching is great, I understand what you teach very well, and because of your style, I feel like I understand why and how these functions come to life and why they work, which really helps me in solving problems, especially in the second phys midterm of my freshman year! Now I've got finals so again I'm back here!

[@awesomevid5447]

Wow .why I had not seen these vedioes during my school time.... By the the way, I am preparing for compitative exam and I find u in very right time... Thank you sir 🙏... For ur help its helped me a lot and u r awesome too.... ✌️ Love and respect from kota, India...

[@MyThundermuffin]

wow michel you are really a talented and gifted person thank you for all of your videos ! EXTREMELY helpful :)

[@Alex-vn7cr]

These videos have helped tremendously. Thank you so much! I wish my physics prof. taught the material like this.

[@jayaprakashk47]

Thank you so......much for this superb video. ITS REALLY AMAZING THAT YOU ARE EXPLAINING PHYSICS IN A SIMPLE WAY!!!!.ITS REALLY HELPFUL.

[@shreshthawadhwa7231]

excellent videos!! Super clear and concise for a university physics level =)

[@sangachidam3219]

Excellent explanations. Thank you sir

[@MichelvanBiezen]

Glad you liked it

[@preetiprasad3933]

Thank you sir, hats off for your efforts.

[@abdullahalsayed9542]

thank you for making all these videos they are really good and helpful

[@bios546]

Really good videos!

[@markbuyan670]

thank you very much.. i learn more... im from phillipines. thank you sir.

[@Nestoroo1236]

With this, I have a fighting chance. Thank you

[@user-gz2po7dx3k]

I appreciate you, you explained everythin clear , THANK YOU SO MUCH!!

[@hamzaansari7035]

i like u man it's better than best.

[@Supermario0727]

If the x-axis is a measurement of time, then will the wave number, k, be known as the period number?

[@MichelvanBiezen]

+John Stuart I have not seen it called the period number, instead it is called the wave number. k allows us to write the wave equation as y = A cos (kx) such that each time x becomes an integer multiple of the wavelength, the function y will have gone through an entire oscillation.

[@shaktikc606]

thanks for uploading

[@AppleBS11]

When cx = 2pi, why will x be the wavelength? Isn't 2pi itself is the wavelength?

[@ahmedal-ebrashy3691]

Loved it

[@MichelvanBiezen]

Thank you! 😃

[@SameerKhan-oc1dj]

remember me sir you are the best

[@MichelvanBiezen]

Yes, we do. Thank you.

[@MusaTibetbaqal]

wow what a great explanation :D

[@spyhunter0066]

Hi sir, I think in the very begining, you typed wrongly when you said cos(0x)=cos(cx)=1. What you meant to write was "cos(c.0) at x=0 not cos(0.x). Best wishes.

[@MichelvanBiezen]

It turns out what I wrote is correct. I was trying to show how to find the periodic relationship of the cosine function. What does c need to be to match the periodic function of the example.

[@spyhunter0066]

@@MichelvanBiezen Well, I know what you are trying to show, but at that moment of the video, you were writing x=0 not the c=0. Plus, we all know c is 2pi/ lambda. Let me make it clear, freeze the video at min 4. It has to be cos(0.c)=cos(c.x)=1.

[@achamyelehkassa1824]

thanks

[@bembemningombam8602]

nice

[@vijendraprasad5174]

big boss

[@benhardsim8629]

Thank you sir , i have struggle to understand the equation inside my text book intuitively

[@issoufcompaore5994]

I like your videos but your markers are not bright enough, or may be there is a problem with the board.

[@MichelvanBiezen]

+Youl Compaore No there's nothing wrong with the board. We just had to invest in some studio lights.

[@haydblogs4603]

prof why total energy of simple hormonic motion are conserved ???

[@MichelvanBiezen]

In theory energy is conserved. For example if you attach a mass on a spring hanging from the ceiling and you pull down on the spring and let go, the mass will (in theory) keep oscillating up and down forever. But we know in the real world that doesn't happen. That is because the internal friction in the spring and the wind resistance etc. If we ignore that, energy will be conserved in simple harmonic motion.

[@ManishYadav-gx8ce]

Sir how does t=o simplify things?

[@MichelvanBiezen]

Manish, When you set t = 0, you are taking a snap shot of the wave at a particular moment. (You could have set t = 1 or t = 2 sec etc. with the same effect) If you know how far the wave moves in one second you can then locate the wave at t = 1 sec.

[@ManishYadav-gx8ce]

if i had your email id, i could better explain myself since i cannot post photos here! you can inbox me to [e-mail]

[@DonSimone1996]

Not all heroes wear capes

[@curtpiazza1688]

Brilliant thorough explanation in less than 10 min! 😊

[@MichelvanBiezen]

Thank you. Glad you liked it. 🙂