Recent content by The Vinh

And you have to use energy to solve this. Book is right. 588 is the correct answer

I need one more information to make sure whether you were right. The object is fastened to only one spring over a pulley or there are something more that you didn't mention about. Because if there aren't anything more then your answer is right.

Oh my god, I remembered writing three replies and now two left

many thanks to you

gneill, did you use paint to draw that picture or what program did you use, i really want to know . Sorry for saying something not related to OP

I think that in this circumstance, we don't need another horizontal force because OP didn't mention about it

Madame, I don't really think that velocity of the box is zero. Imagine that you are holding a lipstick, you go through a hole but you accidentally drop your favorite lipstick. Thanks to physics, it has your velocity instead of zero. Your lipstick survives ! If you release an object while you are...

it always exists air pressure and i knew that Po = P1 + pGH but if i had really done it then the formula would have been like this: Po = Po + 0,5pV^2 then V = 0 , it is so confusing, huh.

I am having a little confuse, why acceleration nearly equaled gravity ? If it happens then why we need tension ?, the spring had to prevent movement of block A, right ? Oh and I assume that block A is moving down

JulienB, i think that i have found the problem and here it is : P1 + pGH1 = P0 + 0,5pV^2 ( P1 = P0 = P air ) => pGH1 = 0,5pV^2 ( it still the same but P1 = P0 = P air) I forgot about air pressure I hope that it is right

Oh, you win, i have made a huge mistake

In your case, the water flows but it is not at steady state. Static pressure only exists when liquid is steady. Assume that i haven't talked about this, only base on logic, how do you manage to solve this because Po = P1 + pGH1 => V2 = 0.

you didn't have to assume Po = 0 because it is the fact.

I think god can do that but not human and especially that we are under the influence of physics laws

It is the force that perpendiculars to the ground