Recent content by jojotank

Hello Dave, i hope you will be reading this. I just wanted to aks you if this diagram is correct when explaining whole situation. Do you think there should be any corrections? Thank you :)

Thank you so much! I understand it perfectly now. I had some ideas when i was looking at the solar eclipse dark spots on the Earth surface, but i wasn't able to drive it to the end. Thank you so much. I don't want to bi nagging and annoying and i hope you will excuse. Light intensity graph is...

Hello. I have some question about iridium flares. My brains can' t process the whole picture. Iridium panell works like a mirror and reflects quite some percantege of light to the Earth's surface, where it makes a bright spot with quite a big radeous. An observer sees a bright spot in the sky...

Thanks to everyone here for help. :) Maybe i should ask more about the situation the proffesor who came up with this problem. I think the problem should have a few more statements.

Homework Statement I am not asking you to help me solve this, so i won't put in any usefull relevant equations or attempts at a solution. The nature of my problem is more of an understanding this collision - it is more of a thinking thing to process here. The problem goes like this. Ball is...

It is totaly clear now. Thank you.

Homework Statement Hello. I was just wondering. You have a simple pendulum . string and a ball with mass at the end. We usually solve examples and we think about conversation of kinetic energy and potentional energy. I was just wandering if there is also something like vertical kinetic energy...

Now it is totaly clear. I can' t thank you enough. I literally love you more than a birthday cake. A chocolate one... With sprinkles on the top... No, seriously - thank you very much!

So it was wrong, that they wrote mv2*(l/2). It should be (b-(l/2))mv2 right? If they choose such point of origin - end of the rod. I can't thank you guys enough. I would totally buy you a beer right now. Thanks.

yes it would - mvl/2 right ?

it should be the same at the end, whatever origin i choose. But let's choose the end of the rod. I don t understand what the middle part does in the problem. To what does it relate?

Hmm. I still don t know why l/2 instead of b...

Hello :) I was doing some problem and i don't quite understand it, so i thought you could help a bit. The problem is: rod with mass M floats in space and then it is hit at distance b (measuring from the end of the rod) by a small particle with mass m. Collision is elastic. I know how i should...