Cylinders Definition and 272 Threads

Hey everyone... I think I am not picking up on something here... The rate of heat flow across a slab is: P = (k*A*T)/D where k is the thermal conductivity of the medium, A is the cross sectional medium and T is the temperature...

Two coaxial cylinders, inner radius a and outer radius b are separated by a material of conductivity given by \sigma (r) = k/r for some constant 'k'. Find the resistance between the cylinders. Here the conductivity is a function of position and the charge density is not zero in the resistive...

Two long, charged, concentric cylinders have radii of 3.0 and 6.0 cm. The charge per unit length is 4.8 10- 6 C/m on the inner cylinder and -8.0 10-6 C/m on the outer cylinder. Find the electric field at (a) r = 4.0 cm and (b) r = 7.1 cm I know how to find the electric field for...

I'm trying to remember how to calculate the equlibrium height of a system of 2 cylinders connected by a tube at the bottom with the smaller cylinder open to the atmosphere and 702.9N pressing down on the other side. I believe it has to do with the pressure being equal on both sides or...

This will be a long thread... hope you'll take the time to read, cause I really need help. A plank with a mass M = 6.00 kg rides on top of two identical solid cylindrical rollers that have R = 5.00 cm and m = 2.00 kg. The plank is pulled by a constant horizontal force F of magnitude 6.00 N...

Hello, I would be interrested in comments, references, books, papers and web pages regarding the problem of mechanical contact between two rings. The attached picture describes the geometry of the problem: a ring (tube) is resting on the bottom of a larger ring (tube). These two rings are...

GR allows for the possibility of travel in time by the space-dragging effect of an infinitely long, dense, rotating cylinder. Q: Why does the cylinder have to be infinitely long? A: It doesn't, an extremely long cylinder will do - long enough to eliminate "edge effects". Q: Why even...

Q. Find the volume of the solid which is bounded by the cylinders x^2 + y^2 = r^2 and y^2 + z^2 = r^2. To me they don't really look like equations of cylinders, more like circles. Would the term "r" be constant in this case? Or would it be a variable? Even if r is a variable, I don't understand...

I am a struggling physiology PhD student and would very much appreciate some help... I need an expression for the capacitance of a cylinder (of finite radius and length) containing an infinite number of infinitely thin cylinders. Any help would be greatly appreciated! Many thanks, -Ian

Hi, could someone offer some advice on the following problem: ===== Q. Using Gauss' law, obtain expressions for the electric field and potential in the space between two thin, hollow, concentric conducting cylinders, of radii a and b, with the outer cylinder connected to earth ===== I...

Here is the problem: First Part (already done): Find the volume of the solid that is bounded above by the cylinder z = 4 - x^2, on the sides by the cylinder x^2 + y^2 = 4, and below by the xy-plane. Answer: \int_{-2}^{2}\int_{-\sqrt{4 - x^2}}^{\sqrt{4 - x^2}}\int_{0}^{4 -...

Here is the problem: Find the volume of the solid that is bounded above by the cylinder z = 4 - x^2, on the sides by the cylinder x^2 + y^2 = 4, and below by the xy-plane. Here is what I have: \int_{-2}^{2}\int_{-\sqrt{4 - x^2}}^{\sqrt{4 - x^2}}\int_{0}^{4 - x^2}\;dz\;dy\;dx\;=\;12\pi...

Why is there no electric field inside a hollow cylinder? :confused: :confused: :confused: Thanks.

2 long charged concentric cylinders have radii of 3.22cm and 6.18cm. Surface charge densit of the inner cylinder is 2.41 micro C / m^2 and outer cylinger is -18.0microC/ m^2. Find electric field at r = 4.10cm (r is the radius as taken from the central axid of these two concetric cylinders) i...

OK, so we have a coaxial cable that consists of a solid cylinder at the core and two concentric cylindrical shells. All the components are conductors. The outer surface of the outer cylinder is grounded and the inner solid cylinder has a linear charge density of lambda. Disregarding the...

I am trying to solve a problem concering roll coating. This is 2 rotating cylinders whith different speeds. The two cylinders are in the same horizontal plane. They don't touch each other, but are close together. On one cylinder there is a fluid. When the fluid goes through the gap, the point...

I've made this pressure shooter for school, but I can't quite figure out this kink. If the cylinder has a volume of 4,994.57 cubic centimeters, and I plan on filling it with 100 psi of air (I want to maximize the pressure) how much air am I going to need? I could just flow it in, but I need to...

Hi, I was just about to finish the chapter on gravity and gravitation in my physics book when I came across (in another physics book) an example problem that showed a motorcycle stuntman riding on the inside walls of a right verticle cylinder. I wondered how it was possible for him to to around...

Hi, I have a problem about the capacitance of two cylinders eccentrically located one inside the other - with radii a and b resp., their centers have a distance c apart. I've tried that with the method of images, considering the eqipotential "cylinders" of a system of two infinite parallel...

Can anybody help me finding the surface area of two intersecting cylinders with different radii and NOT perpendicular to each other (the axes of the two are in the same plane)? Thanks for your cooperation your new friend on physicsforums.com, Xishan

Hi I am taking MV calc and a paticular question in the double integrals chapter asks to find the volume bounded by x^2 + y^2 = r^2 and y^2 + z^2 = r^2. I already know what the shape looks like (Steinmatic solid) and also know the answer can be achieved using single integration as well, but...

Actual Crop Cylinders caught on film! http://www.qubit.org/people/david/UFO/UFO.html Compliements of David Deutsch.