Thanks for the reply, mfb! That makes sense, I did not think of that. I realized I made a mistake in my question though, so I just changed my question a bit right now.
Hi everyone, I'm a bit confused about the concept of the potential energy. Let's say we have the following scenarios here: https://dl.dropbox.com/u/29312856/Springs.jpg
In the first scenario, we have two identical springs with spring constant 5000 N/cm angled at 20 degrees below the...
@Spinnor: Yes, that does look correct to me! :) Except the question is looking for the maximum distance the truck travels :O
I discussed this again with my teacher, and apparently, there might be a mistake in my teacher's work. But yes, thank you for your solution! It gave me an idea of what...
Hi everyone, thanks for all of your help! I'm sorry for not being very clear before, but my main question was the last line in my post: "For spring problems such as these, can anyone clarify for me when to set the force of the spring equal to the force of gravity, or when to use the law of...
Homework Statement
A person stands on a bridge that is 100 m above a river and attaches a 30-m-long bungee cord to his harness. A bungee cord, for practical purposes, is just a long spring, and this cord has a spring constant of 40 N/m. Assume that your mass is 80 kg. After a long hesitation...
Homework Statement
A truck with a steel bed carries a wooden box, where μs = 2μk. The box of mass m is in the middle of the bed of length l. If the truck is moving forward with velocity vo but is slowing down, determine the maximum distance the truck can take to stop before the box hits the...
Ok, thank you DonAntonio and chingel! I completely understand it now. I really really really appreciate the time you guys spent to answer my question. It's been bothering me for days, and I finally get it! :D Thanks!
Hi DonAntonio, thank you for replying! :D
First, to clear things up, my drawing was just a cross-section of a cone to demonstrate what I meant. (Imagine cutting a party hat in half). The rectangles are actually cross-sections of the cylinders :)
Here's a better cross-section of the cone...
Hello, I have actually asked a similar question before, but I just realized something and I want to edit the question now:
I am trying to derive the formula for the lateral surface area of a cone by cutting the cone into disks with infinitesimal height, and then adding up the lateral areas...
Thank you, arildno! Out of all of the places I have asked this question, you and Millenial have been the only ones who could answer my question. I understand it now :) Thank you so much.
P.S., if you're not too busy, can you show me what steps you would need to use in order to use dS correctly?
Hi arildno, thank you for your detailed answer :) I completely understand your second answer (the one about the surface area), but I have a question about your first answer (I apologize if I'm asking too many questions haha). I understand that the volume difference (2*pi*(r+dr))*1/2*dz*dr) is...
Hello Millennial, thank you for your reply! I understand that cylinders have a different slope from cones. However, you said, "Discarding the slope is exactly what you are doing now. Volume is OK to compute like that, but surface area isn't." Why is it okay to discard the slope when computing...
Hello, this is my first time posting on physics forums, so if I do something wrong, please bear with me :)
I am trying to derive the formula for the lateral surface area of a cone by cutting the cone into disks with differential height, and then adding up the lateral areas of all of the...