Statics Definition and 888 Threads

Homework Statement We have a 200-LB door hanging from 2 rollers, A & B, which are 5 feet apart. Coeffs of friction for A and B are .15 and .25, respectively. A force P is applied to the door. How big must it be to move the door to the left?[/B]Homework EquationsThe Attempt at a Solution I...

The last chapter of most introductory textbooks on STATICS introduces VIRTUAL WORK. It is rarely taught (I studied the syllabi of colleagues). I understand the Principle of Virtual Work, having researched and studied the Calculus of Variations, Hamilton's Principle, the Lagrangian and related...

Can someone explain to me why that highlighted force is 0? Homework Equations ∑Fx = 0 The Attempt at a Solution I found FDC to be 780lb and I am still trying to solve for FDE

Homework Statement What's the projection of the resultant force onto an said axis? Homework Equations Sine Law, Cosine Law The Attempt at a Solution For problem 2/20, the projection onto the b axis was found by multiplying the resultant force by the cosine of 30 degrees. Why does this method...

Hi! I'm trying to complete a static force analysis on the bar linkage shown below. The goal is to find the payload mass in terms of the cylinder forces and everything else in a static environment. To simplify things I've made the assumption that the mass of the payload in the bucket acts at...

1. The problem statement, all variables, and given/known data Attached is a diagram of what I am trying to solve. I need to calculate the X and Y components for both F1 and F2. The results will then be used in a later problem that I've already solved but I am coming up with an error and I was...

Hello all, I am a 19 year old female currently in my first semester of engineering school. I have taken other classes such as Physics I and Calculus I & II and done pretty well in them. Today I got my statics exam score back and received a 60%...the average was a 72%. A 60% puts me at the very...

Homework Statement A man deals his bicycle up a 5 percent road at constant speed. Man+bicycle mass=90 kg with mass centre G. 1)Access direction of frictional forces 2) explain why frinctional force in front wheel can be neglected having a const. speed taking front wheel as FBD 3) Find normal...

Homework Statement (a) What is the strength of the electric field at the position indicated by the dot? (b) What is the direction of the electric field at the position indicated by the dot? Specify direction as an angle measured ccw from the positive x-axis. ##Q_{1} = 4.0 C## ##Q_{2} = 9.0...

Hello, We should get the length x , when the grabber can just hold the box. I made two moment equations: Then I put them together into one equation: And from that equation I found out x: Unfortunately the result seems to be wrong. Can you please help me? Where I made the mistake?

If acceleration involves a change in velocity - dv/dt, what velocity is changing for an object at rest with gravitational force? Example - an apple on a table, mg down = the normal force ma up, but neither a nor g seem to involve a dv? the forces involved do not involve changing any...

Homework Statement I am following the first problem on this online pdf: http://www.ce.udel.edu/courses/CIEG212/Homework_1_2007.pdf Homework Equations Equilibrium equations for forces and moments. The Attempt at a Solution I know how to solve the problem, that part is straight forward. However...

To simplify my situation, I am installing a horizontal cantilever pipe (30” length, 3” nominal diameter) which will be connected to a vertical pipe (3” nom diameter, acting as the wall) by a T-connection. See the diagram below. At the end of the cantilever the pipe bends up at 90 degrees for...

Homework Statement I am designing a fixture to hold a large piece of sheet metal on which a track robot will be tested vertically. Below is a sketch (the sheet metal on which the track and robot will be mounted will be attached to the vertical aluminum extrusions in the back) The weight of the...

Homework Statement Homework Equations The Attempt at a Solution So I began by subtracting. (205-160)=55 i (495+128)=623 j Both of these vectors are in the positive direction. So if I divide the vector by its magnitude I should get an answer of 1 in the positive direction for both i and...

My professor explained to us that the purpose of a zero-force member in a truss is to increase the stability of the truss during construction, to provide added support if the loading is changed and to prevent the structure from becoming a mechanism. It is this latter point that I do not...

Hello to everyone, merry christmas and happy new year! I was trying some exercises on the Feynman Lectures, on the topic of statics, and I came across with a problem which, simplified until where I am stuck, asks for the tension of a cable perpendicular to a bar with a weight on the top of it...

Homework Statement Consider the rod as shown in the figure. The coefficient of static friction at A and B is \mu_s. I'm trying to find how big and how small the ratio l/d can be for the rod to still be in equilibrium. I have calculated how big all forces are acting upon the rod in the case...

Homework Statement I need to sum the moments on a and b but when i sum them at b the number I get doesn't work when I check and sum them at a. Homework EquationsThe Attempt at a Solution

Homework Statement Homework Equations I can see how the net force is not the same but I'm not getting the net moment. The Attempt at a Solution 12mm x 10N = 120N-mm. How do these two FBDs not have the same net moments. Thanks for any help!

Homework Statement http://imgur.com/a/IYbP1 A Car sitting on a frame with an attached bar pressing down on the hinged section (Orange). A hinged section coming off the frame with a wheel attached (Blue) How to calculate the radial force on the wheel bearing at 1m away from centre of engine...

Homework Statement Consider the beam shown in (Figure 1) . Suppose that a = 15 in. , b = 8 in. , c = 1 in., and d = 4 in. Determine the moment of inertia for the beam's cross-sectional area about the x axis...

Homework Statement What is the difference between these two formulas Homework Equations 1.Force=rho*g*h*area 2. Force=rho*g*volume 3. Force=rho*height*Area Where rho= specific weight of fluid The Attempt at a Solution I am guessing that 2 is for sphere or cylinders and for 3 i think it is...

Homework Statement The rectangular gate shown in section is 3 m long (perpendicular to the paper) and is hinged about its upper edge B. The gate divides a channel leading to a fresh-water lake on the left and a salt-water tidal basin on the right. Calculate the moment, M, on the shaft of the...

Hello everyone! I am not actually posting this discussion regarding a homework problem. But I wanted to get some ideas from you all about how to approach the analysis of a structure I am looking at for a Statics Project. The structure is very complex, and my project partner and I are trying...

Is there any other way to solve a centroid problem other than integration?

Homework Statement Find the angle Theta so that the system is in equilibrium Mass of each block: 2 Kg Mass of ring: 4π Kg Homework Equations Static equilibrium: Rotational equilibrium The Attempt at a Solution Static equilibrium: 2g + 2g + 4πg = Normal N = 4g + 4πg Taking...

Ive been trying to work out these problems for 2 days now. I've read through the book "Statics and Strength of Materials, Second Edition" By: Cheng. I've googled Everything. I've been on other Forums and have got no reply. I've tried Facebook Math Pages. No Answers. I've been Looking for free...

Homework Statement A 1,500-kg car stands on a square platform, and a 25-kg boy stands on another square platform. These platforms are the two caps of a large oil-filled container. What must the ratio of the platform sides (large/small) for the boy to gently lift the car? -less than 1.5...

Homework Statement can someone please help and explain to me how to do this problem? all the data is in the picture above. Homework Equations i am not entirely sure which equations i should use. i know one possible equation is T=((T_o)^(2)+(wy)^(2))^(1/2) The Attempt at a Solution with the...

Homework Statement The 25-kg rectangular access door is held in the 90° open position by the single prop CD. Determine the force F in the prop and the magnitude of the force normal to the hinge axis AB in each of the small hinges A and B.[/B] Homework Equations ΣF=0 ΣM=0 [/B]The Attempt at...

Homework Statement Homework Equations [/B] ΣFy = 0 ΣFx = 0 TanΘ = sinΘ/cosΘ...

I know that i should use the equation: δ = NL/AE In this case, i looked up E and found it to be 15 KSI. Im trying to find the change in distance between points B and C. Therefore, N should be 2 kips (2000 pounds), L is 150 inches, and A in 0.8 inches squared. Plugging this into the...

Hello can anyone explain how they got 157x210 for the rectangle

Hi can anyone explain how in this solution they were getting for the rectangle 175x210. And how they split the triangles Thank you

Homework Statement I got part A of the problem right. I am stuck on part B. As you can see, they ask for the reactions at B, D and E.[/B]Homework EquationsThe Attempt at a Solution OK, here's the book's the answers: at D, 350N k. At E, -100Nk, and at B -250N k. So, we have a 50Nm torque...

Homework Statement Find force in members EA, EF and EG given the loads shown. A and G are pinned supports. Homework Equations Three equations of equilibrium for sections (method of sections) 2 equations for any node (method of joints). I also used the dimensions to decompose member forces. The...

Homework Statement A smooth bead B is threaded on a light inextensible string. The ends of the string are attached to two fixed points A and C on the same horizontal level. The bead is held in equilibrium by horizontal force of magnitude 2N acting parallel to CA. The section of the string make...

Homework Statement This is a three step problem (I am not fond of the multi-step problems as I can usually do better without multiple steps. Here is the problem: A uniform ring of mass m = 10 kg and radius r = 195 mm carries an eccentric mass m0 = 18 kg at a radius b = 160 mm and is in an...

Homework Statement Homework EquationsThe Attempt at a Solution I'm having trouble coming up with the equations for the system. At first, I thought that m2 = m1sin(theta), but that's not correct. How can I set this problem up?

Here is an example of a problem I am having trouble with. I need to find the i, j, k of A. I have no issues with finding the components for B, but A I just can't wrap my head around when to use cos or sin. Especially here with double projection. I know that A is : (-10 cos70 sin30, 10 cos70...

Homework Statement [/B] Determine the moment about point B of each of the three forces acting on the beam. Homework Equations M = F*d⊥ The Attempt at a Solution I went and found the components for each of the forces. Please double check it if I did them right: F1 : Fx = 0 Fy = 375 lb F2: Fx...

Homework Statement This is the problem I'm having problems with. Homework Equations M=F x r The Attempt at a Solution Let me explain what I've been doing with the practice problems before it, because I fear I may have the wrong understanding. For this exercise I just found the...

Homework Statement A rigid wire frame is formed in a right triangle, and set in a vertical plane as shown. Two beads, of weight W1 = 1.5 N and W2 = 2.5 N, slide without friction on the wires, and are connected by a cord. When the system is in static equilibrium, what is the tension in the...

Homework Statement Given: A 300 kg walkway supported by two rollers(at points A and B) with center of mass at G. Find: The tension T in the horizontal cable attached to the cleat at point B and the force under the roller at A. Homework Equations ∑M = 0 ΣFx = 0 ΣFy = 0 The Attempt at a...

Homework Statement Calculating the moment of force F about the axis isn't hard; how do I determine how to produce the maximum moment? Homework Equations Maxis = ûaxis ⋅ (r×F) F = 30N (This doesn't change at all during the problem) The Attempt at a Solution I would guess that since the...

Suppose I have a beam and I would like to constrain it (two dimensional structure). At one end I've chosen to use support which constrains motion only in "x" and "y" direction (horizontally and vertically), but it doesn't prevent a body from rotation. Because of that, another beam's end have...

Hi everyone, I did a search and couldn't find any useful information on frames and machines for statics (unless I missed it for which I apologize if I did) Does anyone have a few steps that they follow when setting up a FBD of a frame/machine. I'm having trouble being able to efficiently set up...

Homework Statement The signboard truss is designed to support a horizontal wind load of 800 lb. If the resultant of this load passes through point C, calculate the forces in members BG and BF. [/B]Homework Equations For a solution using the method of sections for plane trusses,any three...

Homework Statement The portable reel is used to wind up and store an air hose. The tension in the hose is 100 N and a vertical 200-N force is applied to the handle in order to steady the reel frame. Determine the minimum force P which must be applied perpendicular to the handle DE and the...