Recent content by VHAHAHA

Homework Statement Show that the total weight w of an assembly in thermal equilibrium is a maximum. Homework Equations S= k ln W? dS = dQ/ T ? S is maximize when thermal equilibrium is reached. The Attempt at a Solution First of all, i don't know what does "total weight w" means...

concept problem, we can determine the possible value of Lx in hydrogen atom? The book of introduction to quantum mechanics told me that The value of Lx can not be determined. I know the concept behind this statement However, when I am practicing, I see one of my question that requires me the...

Homework Statement The problem is shown below. Homework Equations Conservation of momentum? pi = pf ∫Fdt = I ? The Attempt at a Solution This question is really strange. I have started to do this question for many hours and I don't know how to start it. I have tried to list...

Can anyone explain this case ? If a moving box is pulling with a force F and the kinetic friction is 0.4F, of course, it will move in the direction of applied force with an acceleration and the net force is 0.6F But what if the force suddenly decreases to 0.3F ? The box is still moving so the...

what is the relation between these two ?:(

what is a Fourier series:confused:

As we know, the 1d infinite potential well has a stationary state. The function that depends on x onky is a sin function. However, I don't understand the concept in this question. I have the answer of this question and this is not a homework. I am not asking for the answer so please don't put...

Thank you. But i still don't understand There are 4 forces! How to use this rule in part 2 =

I don't understand If we see part 1 T=(M+m)g but these 3 force don't have the common point they are parallel

the combined g force = (m+M)g how do go to the same point? i can't see any common point btw Why 3 force will meet at a point if it is at eqm. It there any proof? thanks

Do u mean that i have to combine 2 gravitational force into 1 combined force so that there is 3 force?

But i think that there are 4 forces

Homework Statement I need to find the tension T, γ and β in part 2 of this question. The question is attached. Homework Equations First of all, the frame is a right angle triangle because (3L)^2 + (4L)^2 = (5L)^2 take torque about the point O we got 2LF + mg(4Lcosγ) = Mg(3Lsinγ) from...

Thank you guys. I got the answer. This skill is really useful for dealing with waves in the box. The answer is : fuction = A sin (kx + kl(ell)/4) and A = root(2/a) am i correct?:)

sorry i don't get it where should i change varible do u mean that i should differinate the fuction? I can't normalize it caz i don't know A abd B