Statics Definition and 906 Threads

Please help! I'm having trouble in Statics, and my textbook isn't helping. I've got Vector Mechanics for Engineers by Beer and Johnson. I've heard it's supposed to be a good text, but am finding it inscrutable for some reason. Any recommendations?

http://img831.imageshack.us/img831/8005/f48am.jpg Determine the magnitude of the resultant moment produced by the forces about point O Determine the direction of the resultant moment produced by the forces about point O I first break the forces down to their components. F1x =...

Homework Statement The truss is supported by a pin at A and roller at B. Determine the support reactions. Homework Equations sum of forces along y-axis, sum of forces along x-axis, sum of all torques The Attempt at a Solution Sum of x= Fax+ Fbx+ 5sin45=0 Sum of...

Homework Statement I´ll use an image to show the problem that you can see as attached file. I need to calculate a force-couple system applied to the point C in red, equal to the force f0 applied to the point E. Homework Equations M=fd The Attempt at a Solution Well in these...

Determine the magnitude of the resultant force FR. Assume that F1 = 230 and F2 = 395 Express your answer to three significant figures and include the appropriate units. Determine the direction of the resultant force FR , measured counterclockwise from the positive x axis. I got the...

Hello all, I am trying to understand what the relationship is between the length or height h of a guitar neck and how far in the x direction it is displaced (δ) given the same tension in the strings and width of the neck, and assuming the neck is anchored and rigid at the guitar's body. Is it...

The 6575-lb engine is suspended from the crane boom. Assume the initial weight of members CD and AB to be 10lb/ft and 50lb/ft. Determine the resultant internal loadings acting on the cross section of the boom at point E. Also, find the joint reactions at A, C and D. So far I solve for the...

Author: Russell C. Hibbeler Title: Engineering Mechanics: Statics & Dynamics Amazon Link: https://www.amazon.com/dp/0132915480/?tag=pfamazon01-20 Prerequisities: Prior or concurrent experience in Calculus, Introductory Physics Level: Undergraduate Table of Contents: 1 General...

2 Questions about statics of rigid bodies Homework Statement A cable of length 8.5 m is attached to the two posts as shown in Fig. 6. The crate has a mass of 1000 kg. Find the x and y components of the forces exerted by the cable on the eyebolts and find the tension force in the cable. The...

Homework Statement Homework Equations ƩF=0 ƩM=0 The Attempt at a Solution I have done parts 1-3 (parts 1-2 in image) and I think it's right. It's been a while since I've had statics and I'm not 100% sure it's right. For part 4, where the pulley meets the frame at F do I need a...

I worked out the attached problem. I was just looking for a logic check on my work. The problem asks you to find the component force along the axis of the hook. Thanks

Homework Statement Find the forces of the three strings of this image. http://www.flickr.com/photos/79276401@N05/8395815988/in/photostream Homework Equations Using gravitational constant to find force of the mass. Using algebra to find the forces of the three strings. The Attempt at a...

Hello, and sorry for my English, as I am Norwegian. I have a statics problem which I can not understand. I've taken a pic from my book: The problem asks me to find the largest bending stress, σb, in the incisions 1 and 2. I have the solution in front of me, I just don't understand...

I basically have to solve the system below for which angle theta it's in balance. Meaning all forces equal out to 0. The answer is in terms of the variables. It's been a while since I've done statics like this but it has come back to bite me in the *** again. I started out by moments...

Can one obtain a negative value for mobility i when working out the mobility of a structure; the structure being constrained by either pins, sliders or fixed points? What happens with a negative mobility?

All Questions are shown on pictures. My Calculated answers: A1(a) R= 19.21∠68.7o N (b) E = 19.21∠-111.34o N or = -19.21∠68.7o N <--- Is't either one answer is correct or not? If not, which answer is correct and why? Thanks. A2(b) I = 0.5mr2 = 1.125kgm2 A2(a) k=(I/m)1/2 = 0.212m...

QUESTION Rainwater collects behind the concrete retaining wall shown in the figure. If the water saturated soil (specific gravity 2.2) acts as a fluid, determine the force and center of pressure on a 1-m width of the wall. PROBLEM 1. What does it mean by 1-m width of the wall? Is it 1-m...

hi, for question two on the attached pdf, how would the equilibrium in the x work? From what i understand there must be an x and y component for the pin support at A because it acts at an angle but the support at B only has a y component because it is a rocker.

My question is very simple. When solving static equilibrium problems (such as finding reactions at joints) when should I take the moment about the x,y, and z axes and when is it better to take a joint and find the reaction forces on that joint? Also any other tips will be appreciated.

Homework Statement The unstretched length of a spring is 1.5 ft. What friction coefficient,μ, at A and C is needed so that P=500 lb would tend towards points A and C sliding outward? Given spring constant k=70 lb/ft Diagram- Inverted triangle such that height is 4 ft to point B. Force P...

Homework Statement A horizontal meter stick has a mass of 217 g. Three weights ride on the meter stick: 265 g at 40.7 cm, 191 g at 75.9 cm, and 195 g at 99.3 cm. At what location on the meter stick would the system be in balance if it were suspended there?Homework Equations ƩF=0 Ʃτ=0 Center...

So I'm looking for the reaction forces at the left end of the truss before I solve for the forces in the members of the truss in terms of F and theta. I summed forces in the x, y direction, took moments about point A,B, to get 4 equations in 4 unknowns (Ax, Ay, Bx, By). However, although Ax,Bx...

IHi guys with part b of this question I am having trouble. I have cut it it at the specified members and used the top half. Now i take the moment at A to get the force in BC. (CW+)M@A=(6*3)+(6cos(30)*3)=0, But when you solve this it doesn't give you the answer its supposed to be, I am probably...

Homework Statement #1 If you hold a block of lead and an identical size block of Styrofoam under water, the buoyant force will a) be greater on the lead block. b) be greater on the Styrofoam block. c) be the same on both blocks. d) depend on the depth that each block is held. #2 Salt...

I've been trying to figure this out for 4 days now. I'm completely stumped. I've attached a picture of the diagram: http://postimage.org/image/t3d5i0l1v/ I found the force in F: F = 25.04 lb ---> 16.92i + 18.46j Now I need to find the support forces at A and B. I'm not sure if this is right...

Homework Statement Hi, I am confused by this physics question and I was wondering if someone could help me out. I have a system with 2 pulleys and 3 weights. They are all held together by one string, the two weights on the outside of the two pulleys, both weighing the same, hold up the...

Homework Statement In the following diagram (see attachment), w=80N and the net force is 0. The Attempt at a Solution I basically made two free body diagrams and applied Net Force = 0 for each axis, obtaining 4 equations with 4 variables (T1,T2,T3,T4). I got T1=56N T2=98N T3=115N...

Ive been given this table in a lecture (attached) and I'm not sure what they're using to fill in the columns of Xi an Yi, it looks like it should just be half of each section in Yi, but that is not the case in Xi, can anyone please explain this to me. Thanks =)

Homework Statement A uniform ladder is 10m long and weighs 400 N. It rests with its upper end against a frictionless vertical wall. Its lower end rests on the ground and is prevented from slipping by a peg driven into the ground. The ladder makes a 30◦ angle with the horizontal. The...

Homework Statement In the traveling bridge crane shown all crossed members are slender tie rods incapable of supporting compression. Determine the forces in members DF and EF and find the horizontal reaction on the truss at A. Show that if CF=0, DE=0 also. -Determine force in members...

Homework Statement The simply supported timber foot bridge shown in figure 5 spans 7 metres and, as shown, is carried by two Engineering grade Douglas Fir beams. The uniformly distributed load due to the self weight of the foot bridge and beams is 96 kg/m. The bridge is required to carry a...

Homework Statement http://ft.trillian.im/b0f9eae6eee2cb82091d0bd460ed09948b0cf819/6bh6EcByYLCp8YJWVJ5pqqnrqKcIY.jpg Homework Equations Fx= Fcos(theta) Fy=Fsin(theta) The Attempt at a Solution Starting with number one, I can't understand how to find the force given by that...

Homework Statement For the frame shown (see attached picture) , work out the horizontal reaction at B (ie find Bx)Homework Equations EQUILIBRIUM EQUATIONS: sum of moment = 0 (CCW is positive) sum of vertical forces = 0 (up is positive) sum of horizontal forces...

Homework Statement The crane below is on level ground. The x-axis is through the contact points of the rearmost wheels with the ground, the y-axis is parallel to the front-to-back centerline, and the z axis is vertical as shown. The bed (platform) of the crane is 3 ft above the ground. For...

Homework Statement Find the components of the force at D and C using moments picture attached Homework Equations M=F x r The Attempt at a Solution I'm really stuck on this one. The force from the 70 kg weight is 70*9.8 = 686N, so F=-686j. I found the moment about point C...

Homework Statement http://s11.postimage.org/yvt7eeg35/image.png Homework Equations The Attempt at a Solution So I get that ƩFy = 0 = F(rod)y - F(weight) ƩFx = 0 = F(rod)x - F(spring) F(spring) = 200N * (1.5m + d) d being the unknown distance that the rod has moved by. So I get F(rod)...

1. A uniform metal tube of length 5.0 m and mass 9.0 kg is suspended horizontally by two vertical wires attached at 50 cm and 150 cm respectively from the ends of the tube. Find the tension in each wire. Okay, so I've sketched a diagram out and labelled it. The support would be somewhere...

Homework Statement Three cables are used to support a lamp that weighs 800N. Determine the force in each supporting cable when everything is at equilibrium. Homework Equations ƩF in the x-axis = 0 ƩF in the y-axis = 0 ƩF in the z-axis = 0 The Attempt at a Solution I really...

Homework Statement I'm trying to understand how to determine the sign (+/-) of a given couple. In the sample problem below it shows the 30 lb couple (on the zy-plane) having a negative value for it's force. Is this found by using the RHR? And if so, in which direction do I orient my hand? In...

Homework Statement I was doing a problem with my friend (the image that is attached to this) and when looking up a solution online... It said that the forces at reaction supports B and C are 5 kN in the y direction... Homework Equations The Attempt at a Solution We thought...

The first picture is the question picture. The second picture is my calculation for this questions. I can't find the correct answer, everybody know why? Thanks

Homework Statement http://imgur.com/a/FyekZ I took the liberty of uploading everything. The first picture is the question, while the other two is my attempt at answering it in two parts. What I do not understand is what I did wrong or where I went wrong. I also would like to know why...

Homework Statement A stick is connected to other partrs of a static system by hinges at its ends. Show that a massless stick feels forces, at the hinges, that are directed along the stick. Then show if the stick is massive, the forces do not need to point along the stick. Homework...

1. The homogeneous square body is positioned as shown. If the coefficient of static friction at B is 0.40, determine the critical value of the angle theta below which slipping will occur. Neglect friction at A. The image: 2. NA is the Normal force at A, which is perpindicular to the...

The units are different. One is the force unit, and one is the length unit. Then how to find the h? Question is attached in the file thanks

]1. Homework Statement [/b] The problem is attached in the picture The Attempt at a Solution The free-body diagram is in the second picture. However, when I try to do 1)Sum of horizontal forces = 0 2)Sum of Vertical forces = 0 3)Moments about A, B, C, = 0 I get nonsensical...

Can somebody please walk me through how to solve this? I have tried numerous times but can not seem to find the right answer

Homework Statement The springs BA and BC each have a stiffness of 500N/m and an unstretched length of 3m. Determine the displacement d of the cord from the wall when a force F = 175N is applied to the cord. Homework Equations F=ks ƩFx=0 ƩFy=0 The Attempt at a Solution This is as...

Edit: Nevermind, it has been resolved. Homework Statement I have been attempting to solve what seems like a relatively pedestrian statics questions, but for some reason my answer is being marked as incorrect. The problem is as follows: Determine the magnitude and coordinate direction...

When dealing with a statics problem, do I set individual free body diagrams equal to zero or the entire system?