Statics Definition and 906 Threads

Homework Statement Points A and B are the midpoints of the sides of the rectangle. Replace the force F acting at A by a force-couple system at B. Give the general result and then answer for the specific case: F = 250 N, h = 185 mm, b = 490 mm. The couple is positive if counterclockwise...

Homework Statement "For there to be static equilibrium of a rigid body the sum of the forces and moments must equal zero." From high school I've understood that a body in equilibrium doesn't accelerate but remains at rest or ofc in constant motion. Is the idea of static equilibrium of rigid...

Homework Statement Thee foot segment is subjected to the pull of the two plantarflexor muscles. Determine the moment of each force about the point of contact A on the ground. Homework Equations M=Fd I've used others to help determine certain angles, but I'm not sure if it was even...

A 21-pound force is applied to the control rod AB as shown. Knowing that the length of the rod is 9 in. and that α=25°, determine the moment of the force about point B by resolving the force into horizontal and vertical components. I wish I could say I have some work to show progress, but I...

[b]1. Homework Statement : The Attempt at a Solution I keep attempting this problem and so far I have got this: F1x: 150 F1y:260 F2x:424 F2y:424 F3x:600 F3y:250 Then I add the x's together and y's together, square both and take the square root for magnitude, but can't seem...

In the question I am not able to understand what the scenario is. Is it that we are removing the P force after insertion? If that is the case, both the normal and the friction forces will change after removal of P. Then how can we calculate. Please help, I am going to have my exams tomorrow.

Hey I'm just going over a past paper and I've lost the section of my notes RE this topic. I understand how to draw the free body diagram when there is a pin involved, but not when it is connected at 4 points, the fact that they're at an angle is not helping. Any help greatly appreciated...

I am not able to figure out how to solve this problem. It does not seem to be a statics problem to me. At what point do we consider the equilibrium. Please Help!

Determine the reactions at B and D when b = 60mm ? (Diagram is attached) Since B and D are hinged we don't know the direction as well as magnitude of the reaction forces at B and D. Hence we have 4 unknowns (Bx, By, Dx, Dy). But I can't find 4 independent equations. I got three by ƩFx= 0...

Homework Statement Question: The plate shown, picture is attached, is subjected to force F and 3 reaction forces R1 R2 R3. Find R1 Homework Equations equations of equilibrium: sum of Fx = 0 sum of Fy = 0 sum of moment about point O = 0 The Attempt at a Solution sum of Fx =...

I know how to approach this problem. First, I will need to find the reactions at the supports. Then apply Joint or Section Cut Method to find the forces acting between the members. Then take the force acting on member b0b1 and plug in Euler Buckling equation, while choosing the correct...

Homework Statement Using the pin-jointed structure in the image: a) Set up ALL equations of equilibrium for the structure. b) Determine ALL reactive forces within the structure, including the directions and locations where they act. I have attempted the problem however i can't seem to find a...

Homework Statement You are working for the Peace Corps in a developing country. Your job is to design a simple, but accurate scale for weighing bulk materials such as food and construction materials. A possible idea consists of a loading platform, D, that is supported by cable AB, where end...

Homework Statement I will attach a scanned pic of the problem, but it seems to be a basic frames problem. However, everything seems to have to many unknowns on it to solve. I feel like I'm missing something simple, but I can't seem to make any more progress. Homework Equations ƩM=0...

http://postimage.org/image/8i5i2dtgr/ http://postimage.org/image/8i5i2dtgr/Homework Statement What is the magnitude of the internal force in member BC?Homework Equations So I figured out the reaction force at A and D by taking the moments about point A to find the vertical force at D and then...

Homework Statement I'll attatch it. The Attempt at a Solution Alright, so I work out the angle of the right side... cos-1(12/13) = 22.6° Find the components of the right side... F1x = 800cos(40) = 612.84 F1y = 800sin(40) = 514.23 F2x = 600cos(22.6) =...

Homework Statement Figured it would be easier if I showed a picture http://img210.imageshack.us/img210/707/problemcz.jpg Homework Equations Ʃm=0 Ʃfx=0 Ʃfy=0 The Attempt at a Solution Here is my attempted solution, I am missing member BD and not sure which way to solve it, I...

studying for my test, I have a truss joint equation with 2 variables ƩFx = 0 : 4/15 (15kN) - 10/10.44(Fbd) - 4/5(Fbe) = 0 12 = .957(Fbd) + .8(Fbe) ƩFy= 0 : 3/5 (15kN) - 6kN - 3/10.44(Fbd) + 3/5(Fbe) = 0 6 = 9 -.287(Fbd) + .6(Fbe) -3 = .287(Fbd) + .6(Fbe) this is where I'm...

Homework Statement see attachment Homework Equations The Attempt at a Solution Why is DG, DE in tension while HG is in compression according to the FBD? How did the book determine this? Do you just randomly guess tension/compression and then do the calculations and see if you get...

Homework Statement see attachment Homework Equations The Attempt at a Solution The book says the strut is a two force member. Why then isn't there a equal but opposite direction force Fba at point B? Isn't that what a two force member means? Why for this two-force member only the force at...

Homework Statement The circular plate has a weight W and a center of gravity at its center. If it is supported vy three vertical cords tied to its edge, determine the largest distance d from the center to where any vertical force P can be applied so as not to cause the force in anyone of the...

Homework Statement See attachments Homework Equations The Attempt at a Solution In the explanation attachment, I don't get the last paragraph "Note that force Fce acts downward on bar...compression." Since from the figure Fce is pointing down, and Fbd is pointing up, shouldn't...

Sorry, I meant to title it "Basic statics question on bending moment equation." Oh well. Homework Statement Problem F7-7 http://www.scribd.com/doc/94480961/Chapter-7-Fundamental-Problems Homework Equations Summation of the forces in y, summation of the momentsThe Attempt at a Solution I...

Hello, I'm new and quite unfamiliar with all the conventions, but I'll use underline for vectors since I couldn't find the proper thing (is the convention to use bold here?) Problem: No more.Relevant equations: Fnet = ma = 0 τnet = Iα = 0 τ = r x F = rFsinθ Fbuoyancy = ρwaterVgAttempt at...

[b]1. every member is 0.45m and all the angle is 45degree... C is fixed support, D is roller support [b]3. Ʃfx = 0 , Cx = 0 Ʃfy = 0 , Cy + Dy = 20N ƩMc = 0 , 20(0.45) + Dy(0.45) = 0 Dy = -20N...

Homework Statement Determine allowable load on steel tube L= 14 in A= 11 in ^2 Es= 30 x10^6 θ=24,000 psi δ= .008 Homework Equations δ=PL/EA θ=P/A The Attempt at a Solution .008=P(14 in)/(30 x 10^6)(11 in)^2 P=188571.4 lb θ=P/A 24,000 psi=P/11 in^2 P=264,000...

Homework Statement Determine the reactions at rocker support A and pin support B.Homework Equations ƩF = 0 ƩM = 0 The Attempt at a Solution ƩFx = 0: -Asin(25) - (800lb) + Bx ƩFy = 0: Acos(25) - (500lb) + By I'm getting thrown off because of the rocker on an incline.

Homework Statement FIND A FORCE OF A 3-D TRUSS Homework Equations ƩFX=0 ƩFY=0 ƩFZ=0 The Attempt at a Solution I figured out rB(2i,-1j,0), rc(2i,1j,0),rd(1i,0,2k) can you check if my vectors r right. After find the vectors of point B,C,D I calculated the unit vector, not I am...

Homework Statement Homogeneous cube with one edge lying on the floor and the other on a smooth vertical wall. The underside of cube with a horizontal surface makes angle of \frac{\pi}{6}.What is the value to the coefficient of friction between the cube and the floor to cube remain in...

Homework Statement A uniform beam of mass M and length L is mounted on a hinge at a wall as shown in the figure. It is held in a horizontal position by a wire making an angle (theta) as shown. A mass m is placed on the beam a distance from the wall, and this distance can be varied...

Homework Statement Find the force 'p' and angle 'alpha'. Homework Equations m=rXf The Attempt at a Solution I calculated the couple moment by using M=rXf, I plugged r=12 and f=8 and the answer come out to be 96 lb.m. After finding the couple moment I am stuck now, I could not...

Homework Statement http://img706.imageshack.us/img706/7156/mecx1jpg.jpg Homework Equations http://img837.imageshack.us/img837/6987/equationsr.jpg The Attempt at a Solution I find myself with 2 unknowns, 1 equation. http://img708.imageshack.us/img708/4281/mecx2.jpg

Yep...back to old statics. Not because I have a test (already passed it in flying colours) just for fun seeing what I can solve and can't...now I ran into this:Homework Statement http://img705.imageshack.us/img705/1533/pulleyf.jpg Statics: The weight is 50kg. Find force P to hold it in...

Hello, I am the parent of a ChemE student. He is a Jr at a California State University. He has some learning difficulties which makes problem solving / life issues a bit tough on him. I am just trying to help him out. He failed Statics last fall. He just came home from Spring Break and...

URGENT need Information about statics class offered online?? I need to find a university or comm. college that will be offering statics online over the summer. If you have any ideas of schools i could call please list them. Thanks!

Homework Statement Determine the largest mass m of the suspended block so that the force in any member does not exceed 52 kN(T) or 47 kN(C). Homework Equations ƩM = 0 ƩFy = 0 ƩFx=0 The Attempt at a Solution Did I assume the arrows right? Would this be the right track to...

Homework Statement Good day to all. I have been given a problem in statics and a system in equilibrium which in turn is giving me some problems. I have attached in a pdf file the problem context as well as my attempt at a solution. I have done so, because I was experience some problems with...

Homework Statement Good day to all, I have been given a problem in statics, ore specifically a system that is in equilibrium, but a system I am having some trouble with. I have attached (in pdf) the problem's context and the free body diagram I have drawn. The data we are give are as...

This is not a HW question! THIS IS A DISCOVERY that I want to explore. I will explain it as follows: Suppose I have this exercise, where I know the static coeffecient between the beam and the floor is 0.3, whereas in the wall there is no friction. I want to find out if the beam slides, or...

I am confused about the some of the concepts behind fluid statics. Here is an example to illustrate this, using Pascal's barrel experiment. Consider a cylindrical barrel with cross-sectional area A and height H. Now insert a straw of height h and cross-sectional area a so that the total of...

Homework Statement Homework Equations M = F*r The Attempt at a Solution I tried splitting each force into its xy components and solve but the answer is wrong. Here is my attempt: For point A: Horizontal moments: (3 * cos 25) * 5.4 - (2 * cos 30) * 4 Vertical moments: - 4 * 1.5 - (3...

Hey everyone. First time poster here. I was helping a friend do some Statics homework (I completed the course last Fall), and I ran into a really unsettling problem. I have done this problem over several times with the same result. When I do the problem only summing forces in the X and then Y...

Calculate the support reactions at B and E for the 9m length beam shown below. I have the answers at 4.71KN and 1.79KN but it is old work that i am revising and i can't remember how i got to them. One of the supports not being at the end is throwing me off. If anyone could show a rough working...

Homework Statement Mercury is poured into a U-tube. The left arm has a cross-sectional area A1=.001 m and the right has A2=.0005m. One hundred grams of water are then poured into the right arm. Determine the length of the water column in the right arm of the U-tube; given the density of...

Hi, I just signed up with the forum. I have a degree in Mechanical Design, have been working as a drafter. It's been about 10 years since I've done any statics and wanted to re-learn this stuff by making a bucket loader for my garden tractor. The last few months I've been reading my...

Homework Statement Determine force of each member using joint method Homework Equations T = F x D The Attempt at a Solution Answers are: Fab 2465 T Fbd 1200 T Fbc 1375 C Fdc 750 C Fde 860 T (This one is what I tried) Fce 649 C Fac 1922 C Thanks.

Hi there, I have been given the questions below as part of some revision before we begin mechanics next term. I have looked back through my notes and I seem to be missing the notes on calculating the forces. So far I know XZ = 9.49m ZY = 4.24 Angle x = 18.4 Angle y = 45 Angle Z =...

Homework Statement Find the displacement (mm) in the horizontal direction of point A due to the force, P. P=100kN w1=19mm w2=15mm Homework Equations \tau = G * \gamma \tau = Shear stress = P / A \gamma = Shear strain = (pi / 2) - \alpha The Attempt at a Solution I haven't...

Homework Statement Replace the force for by the equivalent of two forces parallel at the dot and the other perpendicular to the beam. The force P is 2000 N Determine the forces!Homework Equations Fx= P*cos(x) = Fy= P*sin(x) = The Attempt at a Solution Fx= 2000 N* cos(75)= 0.517 kN Fy=...

Homework Statement http://img843.imageshack.us/img843/5370/helpxd.jpg Homework Equations Sin law The Attempt at a Solution I got to: F1/sin(105) = F1u/sin(45) = F1v/sin(30) I get F1u = - 219 and F1v = 254.5... It says it is wrong, not sure what I did.