Recent content by LordGfcd

Assume there is a boundary separates two medium with different heat conductivity [κ][/1] and [κ][/2]. In one medium, the temperature distribution is [T][/1](r,θ,φ) and on the other medium is [T][/2](r,θ,φ). What is the relationship between [T][/1] and [T][/2] ? Is it - [κ][/1]grad [T][/1]=-...

Ok thanks very much. It was the project of the tension on the z-axis. My solution had the same idea as Raihan's - pressure equillibrium.

Hi. I was trying to solve the same problem you submitted. And I've read Chestermiller's solution to the problem. But I don't understand why in the post #13 there is a sqrt(1+(dr/dz)^2)) ? I would appreciate the help. Thank you.

Thank you very much, I was completely wrong with my argument.

Actually I solved this problem assuming the cube is deform before the normal force make balance with gravity. I eventually find an acceptable result (a=10cm,m=1kg,E=10^7 Pa) : 2,27 μm. But I still think my approaching is wrong because I didn't consider the normal force (action equal minus...

Let's first consider a cube side length a, mass m, Young's modulus of the block is E. How do we calculate the decrease of the height of the center of mass of that cube ?

Oh, it's must be my fault, I totally forgot the surface tension. The original problem was just "find the mathematical description of a shape of a falling drop of water in the atmosphere" so I added some variables and data that I thought would be involved. I will take another attempt and see what...

Well, there is the atmospheric pressure and the bulk modulus that determine the size of the water drop. If the velocity is constant then the dragging force should be constant too but different with each part of the water drop. The force on the x-axis will be p0.dS and the force on the y-axis is...

Not yet, I'm still working on it but haven't got much progress.

Hi, I was wrong about the bulk modulus definition :v It was K=-v.dP/dV. My bad :(

Homework Statement A drop of water fall towards the ground with initial mass [m][/0] and radius [r][/0] (assume the initial shape of that water drop is sphere). the air resistance is F=½.ρ.A.[v][/2].C (C is the drag coefficient, A is the area that the air contact with the water drop and ρ is...

Thanks !

I'm Hien Nguyen, 16. I am studying in Hanoi University of Science (not in college yet but in the high school that the university founded), Hanoi, Vietnam. My goal right now is to be in the Vietnam's Team and participate in the next International Physics Olympiad in Lithuania (IPhO 2020). In...