Solid Definition and 1000 Threads

Question, If I make a rocket engine using KNO3 fuel and bentonite clay for the nozzle, shouldn't the ISP of the engine be slightly higher due to the radiation? It would be nearly Immeasurable but nevertheless there. Kind of like the way a NERVA engine works.

Here is the question: I have posted a link there to this topic so the OP can see my work.

Homework Statement A spherical conductor has a spherical cavity in its interior. The cavity is not centered on the center of the conductor. If a positive charge is placed on the conductor, the electric field in the cavity A. points generally toward the outer surface of the conductor. B...

A spherical shell and a conducting sphere each of radius R are charged to maximum potential. Which of the two has more charge? My attempt: Since in a conductor, no charge can reside inside the conductor so all charge is on the surface of the conductor just like the spherical shell. Now ...

Homework Statement The question is "Use double integration to find the volume of the solid bounded by the cylinder x2+y2=9 and the planes z=1 and x+z=5" Homework Equations The Attempt at a Solution I tried to draw the curves and the solid that i formed is a cylinder with a...

Here is the question: I have posted a link there to this topic so the OP can see my work.

Hello, Quick run-down: I am attempting to model thin film materials (e.g. Ti-Al-N) for thermal analysis. I am confused on how to figure out the number density of Nitrogen for a ceramic. All the tables I have in school textbooks are for gas (~0.0013 g/cm3). I can find density of...

Here is the question: I have posted a link there to this topic so the OP can see my work.

In an Engineering course I was used to being rewarded for proving a good understanding of theory. For example, if I explained a basis of the following solution, it would still give some rewards, even if the solution itself had major computing errors or even if it was partially mathematically...

Hello, I'm working on a poster and senior thesis in materials science research and need to draw schematic diagrams of a few objects including: -a PLD chamber -Thin films -XRD -SEM -energy diagrams -a sin wave I've downloads inkscape and have tried to draw in powerpoint so far. Are...

Confusing Solid And Plane Angles ! Supplementary Quantities - 1.Solid Angle - Steradian 2.Plane Angle - Radian Doubts - 1.What Is The Use Of Supplementary Quantities ? Physical Quantities Are Used To Measure For Example .. To Measure Length - m Current - ampere Etc... What Can I...

Hi everyone - quick question on something that's been bugging me. So, train wheels, which are solid steel, have incredibly low rolling resistance, an order of magnitude less than average car tires. This is because they don't bend significantly, so you're not wasting energy to heat as in the...

find the volume of the solid generated by the revolution of the curve $y^2 (2 a - x) = x^3$ about its asymptote.

https://www.physicsforums.com/attachments/1012 [FONT=arial]Let $$f(x)=\sqrt{x}$$, Line $$L$$ is the normal to the graph of f and point $$(4,2)$$ (a) show that the equation of L is $$y=-4x+18$$ $$f'=\frac{1}{2\sqrt{x}}$$ so $$f'(4)=\frac{1}{4}$$ so normal would be $$-4$$ then L is...

Has anyone ever built an internal combustion engine which runs on solid fuel? A system would have to use waste heat or a mechanical friction device or whatever to heat the fuel and produce vapor which would be burnt in the cylinder (similar to the way coal gas was produced). Of course the vapor...

Here is the question: I have posted a link there to this topic so the OP can see my work.

how does letting the electrons diffuse to the P material/region lead to a "depletion" region in the center where the N and P material meet? please go into detail

Hi. Consider a solid body placed in vacuum. How much is its pressure? Can we describe this body using thermodynamics if its pressure is zero?

Homework Statement See the image. Homework Equations T=Iα, F=ma, I=0.5*m*r^2, Friction=u*N The Attempt at a Solution I used the torque equation to get Tension = mcylinder*a/2, and then plugged that into a force equation for the block. mblockgsin(30)-Tension-Friction=mblock*a so...

Homework Statement Given a solid hemisphere with radius R and uniform charge density ##/rho##, find the electric field at the center. Homework Equations ##E = \frac{1}{4 \pi \epsilon_{0}} \frac{Q}{r^{2}}## ##E = \frac{1}{4 \pi \epsilon_{0}} \int \frac{\rho (x',y',z') \hat{r} dx' dy'...

Hi folks, can someone help explain this in words of one syllable or less? I am looking at a text that compares flux and intensity of a distant source, and it states that ∫∫dΩ = ∏ I know that dΩ = sinθ dθ d∅ but I don't understand where the given result comes from. What are the...

Hello, I have found several references (I can send you the links if you want) that point to the fact that the enthalpy under uniaxial compression along z of a solid is simply given by: H=U+PzV This appears to make sense as during uniaxial compression the Pz pressure component is the...

I am trying to find the minimum thickness that a sleeve (without relief) needs to be in order to not fail when assembled by interference fit. I know the interference value and the outer diameter of the shaft, but that's all... How do I solve for pressure, stresses, and ultimately the minimum...

A small solid sphere of mass M0, of radius R0, and of uniform density ρ0 is placed in a large bowl containing water. It floats and the level of the water in the dish is L. Given the information below, determine the possible effects on the water level L, (R-Rises, F-Falls, U-Unchanged), when that...

I hope this isn't a common question, and that I'm not breaking any rules of posting - please let me know if I am, as I'm new here. So, to describe what I'm trying to ask: Picture a very long rod, say, one light-year long. Imagine it's in space, and is free of gravitational interactions (and...

Hi all, How can I excitation - ionization solid metal ? May by radioactive material which is too soft.

Homework Statement Referring to the parallelepiped in Question 3 in which vertices E,F,G,H are respectively the diametrically opposite corners to A,B,C,D . Find the volume, in cubic units of the solid with seven plane faces BGD,BCD,GFD,BHG,GHEF,EFGC,BHEC Homework Equations The...

1.Determine the volume of the solid obtained by rotating the area between the x-axis and the graph of the function given by f(x) = cos(x^2) with x between (pi/2)^0.5 and (3pi/2)^0.5 ,about the y-axis. 2.What is the volume if the above area is rotated about the line given by x=4. Thank you in...

Here is the question: Here is a link to the question: Calculus homework help? - Yahoo! Answers I have posted a link there to this topic so the OP can find my response.

Homework Statement Find the volume of the solid generated by revolving about the line x=-1, the region bounded by the curves y=-x^2 + 4x - 3, and y=0. Homework Equations Shell Method? The Attempt at a Solution V= 2pi * ∫x* f(x) dx, where a and b are the lower and upper limits of...

Homework Statement Volume of solid rotated about x-axis x=1+y^2, y=1, y=0, x=0 using shell method Homework Equations The Attempt at a Solution so i set up the integral with ∫2pi(y)(1+y^2)dy from 1 to 2 which is apparently wrong, but i don't know why.

Somehow I missed my registration notification for Fall and the E&M and Mathematical Physics classes are full. I am an astrophysics major. I wanted to take nuclear physics, but it will not be offered again until Fall 2014. I will be taking thermodynamics in the fall, but I am wondering if I...

Here is the question: Here is a link to the question: Find the volume of the solid obtained by revolving the region enclosed by y = xe^x , y = 0 and x = 1? - Yahoo! Answers I have posted a link there to this topic so the OP can find my response.

How come the area below the graph of $$\frac 1x$$ between $$[1, \infty)$$ does not exist, but the solid of revolution below the same graph in that same interval does exist? I do not see the logic.

Here is the question: Here is a link to the question: Volume of a solid of revolution about x=3? - Yahoo! Answers I have posted a link there to this topic so the OP can find my response.

to my fellow mechanical engineers, please help me with some basic machine design problems. a certain drive shaft rotating at 500 rpm transmits 200 hp to an 8 inch diameter gear. Design a suitable solid shaft for this application. the shaft is ductile. Design stresses are to be limited to...

Homework Statement A solid disk of mass m and radius R rolls without slipping with a velocity v. Assuming it doesn't slip, how far vertically will it roll up an incline? Homework Equations I=0.5mr2 E=0.5Iω2 KE=0.5mv2 PE=mgh The Attempt at a Solution I'm thinking that we need to...

Homework Statement Saturated liquid CO2 is at T= 293 K and P=5.72*10^6 Pa and undergoes throttling to P=1.01*10^5. The resulting solid and vapor mixture is at T = 195 K. What fraction of the carbon dioxide is vaporized? (The enthalpy of the saturated liquid in the initial state is 24,200...

Homework Statement Alright well I think I have this right, but my teacher has it done a different way.. Find the volume of the solid obtained by revolving the region bounded by y=x2+1; y=9-x2 about y=-1. Homework Equations The Attempt at a Solution So I thought the integral would...

Homework Statement Consider the region bounded by the curves y= lnx and y=( x-3)^2 Find the volume of the solid obtained by rotating the region about the y-axis Homework Equations The Attempt at a Solution For this I solve for the x so i got x= e^y and x= (y)^(1/2) +3...

Does anyone know for sure that when standing in a single spot (for a better idea we will say on a block of steel) that there is a microscopic indent (not permanent) on the steel block. For more elaboration I see it as the same aspect as walking on a plank of wood and it will bend due to your...

Find the volume of the solid obtained by rotating about the y-axis the region bounded by the curves y= e-2x^2, y=0, x=0, x=1. Should the bounds for the problem be taken from the y-axis or the x-axis? I think that the integral for this problem would be: ∏∫(e-2x^2)dx , is this correct

Homework Statement The volume shown lies above a square in the (x, y) plane having corners (4, 1), (5, 1), (5, 2), and (4, 2). The remaining two surfaces are planes defined by z1 = 2x + 4y + 7 and z2 = 3x + 6y + 8. The density of this object is 880.y. Determine a) the volume of this object...

Homework Statement A solid sphere - 20mm in diameter, σ (specific gravity) = 1.3 dropped in water μ=1*10^-3 and ρ=1000 determine the terminal velocity for the sphere. (hint- guess the value for the drag coefficient then iterate) Homework Equations Fd=(1/2)*Cd*ρ*(U^2)*A...

Homework Statement Homework Equations {3.9b} A[2\mu -m\omega ^2 ]=2\mu Bcos(\frac{ka}{2}) B[2\mu -M\omega ^2 ]=2\mu Acos(\frac{ka}{2}) The Attempt at a Solution All I can think of is setting k =\frac{\pi}{a} so that B[2\mu -M\omega ^2 ]=A[2\mu -m\omega ^2 ] solve for omega...

Hi Everyone, For an individual inquiry and formal lab report task at school I have chosen to conduct an experiment to find out whether hot shoe mounted flash units follow the inverse square law and how the flash zoom is affected by the inverse square law. My first question is that In order...

Homework Statement Find the mass and the center of mass of the solid E with the given density function ρ(x,y,z). E is bounded by the parabolic cylinder z = 1 – y2 and the planes x + 4z = 4, x=0, and z=0; ρ(x,y,z) =6. m=? x=? y=? z=? Homework Equations z = 1 – y2 and the planes x...

Homework Statement Calculate the volume of the solid of revolution formed by rotating the region around the y-axis. Apply the shell method. f(x)=e^x, x=0, y=8 Homework Equations V=∫2∏x((f(x))-g(x))dx The Attempt at a Solution This is what I did: (I integrated from 0 to 8)...

Homework Statement Can i use "pyramid" method to derive the equation of Moment Inertia solid sphere? The pyramid is such we slice a watermelon. Sorry for my bad english. Regards. Homework Equations 2/5 MR^2 The Attempt at a Solution

Homework Statement Find the volume of the solid formed by revolved the region bound by the graps of y =x^2 + 1, x=0, and y =10 around the y axis. Homework Equations pi r^2 The Attempt at a Solution The x bound 0 is given to us. I solved for y=10 by 10=x^2 + 1 I am not sure if I...