Statics Definition and 888 Threads

Homework Statement Door weighs 20kg, and is held open by force P at doorknob opposing 15kg weight attached at C and wrapped around pulley. Theta is 90 degrees, so door is on x axis. Find torques on hinges A & B[/B]Homework Equations P is 118.8N in -k direction, which agrees with answer in...

Homework Statement Given: T(sub-B) plus T(sub-B) prime = 36. Both T(sub-C) values are 0. T (sub-D) =36 and T (sub-D) prime = 12. Find values of T (sub-B) and T (sub-B) prime[/B]Homework Equations OK, so we need to find the wrap angle, which should be 180 + 30 -22, which comes to 188...

Homework Statement Calculate the stress in every segment of the system. AD and BC are laton and AB is steel. Homework Equations geometry compatibility-δ(A/D) +δ(A/B) - δ(C/B) = 0 F(D) - F(C) - 50 =0 The Attempt at a Solution I supossed that DA and BC are in compression and AB is in...

Homework Statement http://oi59.tinypic.com/2lacy0o.jpg Homework Equations P = ? T2/T1 = e^(u)(θ) M = 150 N*m The Attempt at a Solution [/B] T2/T1 = e(.4)(7π/6) T2/T1 = 5.466 I don't even think I'm on the right track.

hey guys. bellow is an upside down cone frustum with the dimensions given bellow where the green R is the radius of the larger circle and the blue r is the radius of the smaller circle and the red h to be the height of the object knowing that volume of this shape is calculated as...

Hey there, In my statics class we're just finishing up moments of area or moments of inertia as they're being called. I can do the math and figure them out just fine but I have no clue what I'm actually finding! What is it? I am having trouble actually conceptualizing what it is that I'm...

Homework Statement A horizontal uniform bar of mass 260 kg and length L = 3.0 m is placed on two supports, labeled A and B, located as shown in the diagram. A block of mass 60 kg is placed on the right end of the bar. Find the normal forces FA and FB exerted on the bar by the supports. Enter...

Homework Statement Find lx and ly. The Attempt at a Solution So after countless studying of this topic, and no notes from my professor to help, I thought I had the process figured out. But this initial image is throwing me off a bit. Here's what I believe to be the right process for these...

I'm currently reviewing for a final tomorrow, I need to score a B on the final to stay in school. I'm beginning to panic as I've reviewed all day and have gotten nowhere. 1. Homework Statement The tension in the cable AB is 800 lb. Determine the reactions at the fixed support C. The Attempt...

Homework Statement Determine the force in member BE of the loaded truss. See the attached picture. Homework Equations Sum of the Moments = 0 Sum of the Forces = 0 The Attempt at a Solution [/B] Sum moments about A to get: -12L - 56L +40Dy = 0 Dy=1.7L Sum the forces in the y...

Homework Statement The right angle boom which supports the 230-kg cylinder is supported by three cables and a ball-and-socket joint at O attached to the vertical x-y surface. Determine the reactions at O and the cable tensions. Homework Equations M [/B]= r x F unit vector =...

Homework Statement I've used all the proper equations and done all the work with no problem. My only question is when computing the maximum stress, how do I know which one is the tensile and which on is the compressive? I've attached all my work and came out with Max stress = 3.84 Mpa and Max...

Homework Statement Homework EquationsThe Attempt at a Solution 1. I first found the angles each cable made with the pillar. 2. With these angles I found the components of the forces in the x and y direction. 3. So ∑Fx and ∑Fy were found. 4. Then using these values I equated...

Dear All, I am often get confused when four terms STATICS,DYNAMICS,KINEMATICS and KINETICS are used in physics Mechanics.can someone please differentiate between these four terms.i will be thankful.

Homework Statement A solid uniform hemisphere rests in equilibrium with its curved surface in contact with a rough inclined plane which is elavated by an angle α where sin(α) = 3/16. Find the angle between the symmetry axis of the hemisphere and the vertical.[/B]Homework Equations Sine rule...

Homework Statement [/B] Shown below is a slew gate controlling the flow of salt water flowing into fresh water in a submarine depressurising chamber (used to measure the pressure depth and which is compared to a control signal that has been calibrated). On the inlet side, the depth of...

Homework Statement 1. Pulley B is free to move on the cable ABC which is fastened at A and being pulled by force F through the pulley C. Neglecting friction: a. Determine location of point B as a function of d. b. Express the force F required to maintain equilibrium in terms of P...

Homework Statement For my statics homework, we are directed to: Draw the free body diagram and use the force and moment equilibrium to determine the support reactions for the following systems I'm having a bunch of trouble with problem 4.10, which is displayed in the following picture I'm...

Hi! Can anyone help me with these problems? When I try to draw a parallelogram, I couldn't find the angles. Please help. http://imageshack.com/a/img673/8733/GsXt9f.jpg http://imageshack.com/a/img910/1949/1AB7iB.jpg

Homework Statement [/B]Homework EquationsThe Attempt at a Solution [/B] Honestly, I don't even know how to begin this problem. I've drawn myself some free body diagrams, but I'm uncertain of all of them. The weight of the bar is just (0,-mg) at .9r from the pivot point. But I don't know how...

hey, so I'm currently studying electronic engineering on year 2 of level 3 and having to study mechanical principles this year which I don't really know anything about and my tutor doesn't explain properly. I would appreciate some help on the method of calculating the questions. I've added clear...

Homework Statement a concrete dam, 20m in height, has a vertical upstream face. if the water level is coincident with the top of the dame, calculate and plot the pressure intensity at 4m intervals over a vertical and thus determine the total hydrostatic force acting per unit width. Show that...

Homework Statement You're carrying a 4.0-m-long, 24kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. I've drawn a diagram of the problem on Paint... Homework Equations ∑τ=0...

Homework Statement Homework Equations The answer in the back on the book shows 4.06i -7.61j + 5.07k. I do not understand why my signs are backwards.The Attempt at a Solution I ended with -4.06i +7.61j - 5.07k

Homework Statement There is a copy of the problem in the picture with the graph. Homework Equations M = F*d, M = Fxr, F_x = Fcos(theta), F_y = Fsin(theta) where theta is measured off the positive X axis, The Attempt at a Solution I tried splitting the force vector into X and Y components and...

Homework Statement This problem is from WileyPLUS. I've been looking through my book, but none of the methods they present work for me. I guess I just don't know how to use them properly. Determine the moments of the 5.6-kN force about the point O and about point B. Homework Equations I...

Homework Statement The body is connected to the ground with a moving joint at B, the body slides with no friction at A. Homework Equations ΣF=0 => ΣFx=0 & ΣFy=0 ΣM=0 The Attempt at a Solution First I made a drawing: At this point I started calculating: ΣFx=>P-R2-F1, so: P=R2+F1 ΣFy=>...

Homework Statement Homework Equations ∑M = 0, ∑Fx = 0, ∑FY = 0 The Attempt at a Solution If so, If so, I will be using the method of sections to cut along the red line as indicated in the picture. This gives me 3 equations of equilibrium as shown above. However, before solving these...

There isn't much data, I'm just supposed to simplify the drawing of the body OA and find the forces. The body has a mass m and is connected to the ground with a moving joint in O. Below I post the drawing that I made. I changed the line into a force S, which I then divided into Sx and Sy. I...

Homework Statement The beam ABC is1000LBs and its center of mass is given as 6.5ft to right of B. B is a pin joint. A & D are frictionless rollers. Find tension in cable.Homework Equations Call the tension in the cable T. Trig shows us that the left-hand triangle is 45 degrees at ABD and the...

1. The Problem 2. The Free Body Diagram 3. The Question I've always had trouble determining the direction of the vertical and horizontal components in FBDs for statics problems, especially for a pin. Prior to looking at the solution, I wasn't sure on almost all of the directions of the...

When examining a member, how do I tell whether it is undergoing tension or compression? It's more of a general question, but since a visual might help with the explanation, this could be useful:

Homework Statement I signed up for Mechanics of Materials, but it turns out my statics is very rusty. Here is the problem, we are to compute the six component forces about the joints: Homework Equations Force and moment equations are the name of the game. The Attempt at a Solution [/B]...

Homework Statement Find the magnitude and direction of the resultant force Fr=F1+F2+F3 by first finding F'=F1+F2 then Fr=F'+F3 known values are in the link Homework Equations Basic vector addition. Law of cosines. Law of sines. The Attempt at a Solution Here's my attempt. I'm not convinced by...

Homework Statement There isn't really a problem statement. This is for something I am myself designing but I'm struggling conceptually with the basic statics analysis. It's a simple square truss. If I were to write a problem statement it would be "What are the reaction forces at A and B?" My...

Hi all, I was reading an article that utilized a 3x4 statics Jacobian and said to calculate the kernel vector: You can row by row, where Where Ai is the statics Jacobian with the ith column removed. The problem is I have a 3x3 statics Jacobian, so if I remove the ith column I will end up...

Homework Statement On this vector I didnt get the right answer: x = [ 5 8 10 11 137 ] [/B] q3: i = (p/100)*n = (75/100)*5 = 3.75 >> 4th in vector is 11 q1: i = (25/100)*5 = 1.25 >> 2nd is 8 in MATLAB is solution Homework EquationsThe Attempt at a Solution

Please Help! I've been working on the problem for all day now and can't seem to get it right. One of my attempts came close to the answer in the back of the book but was off by about 4, the it should be at 30 degrees M=5860lb ft, and I got 5856. Along with this I have to enter the equations into...

Homework Statement The tank shown in the figure is filled with water and fastened to the ground. There is a small opening on top of the semi-spherical part of the tank. a) What is the magnitude of the horizontal force on the screws? Explain using a free body diagram. b) Consider the proper...

< Mentor Note -- thread moved to HH from the technical physics forums, so no HH Template is shown >[/color] I didn't attend the lecture in which the professor explained trusses so I don't really know. Am I doing something wrong so far? is the force DE 0? because if go at the point C and...

Hi, I am looking for a really good reference textbook for learning classical mechanics.I understand it's pretty absurd to quote the subject as references to "Engineering Mechanics" as it's nothing different from the classical mechanics in physics.But I am looking for a perfect reference...

Homework Statement Two 10* wedges of negligible weight are used to move and position the 400-lb block. Knowing that the coefficient of static friction is 0.25 at all surfaces of contact, determine the smallest force P that should be applied as shown to one of the wedges. Homework Equations I...

Homework Statement A 120lb cabinet is mounted on casters that can be locked to prevent their rotation. The coefficient of static friction between the floor and each caster is 0.30. If h=32in, determine the magnitude of the force P required to move the cabinet to the right (a) if all casters are...

Homework Statement Find magnitude of net upward force on a cube in terms of l, ρ (rho), g and h. then show that h = m/ρl2 A solid cube, mass m, side length l, is placed in a liquid of uniform density, ρ(rho), at a depth h0 below the surface of the liquid, which is open to the air. The upper...

Homework Statement I've solved all but one force. I can't seen to get the force within element D-C. All relevant variables are shown on the pics attached i.e loads, supports, dimensions etc... Homework Equations Sum of forces in x=0, sum of forces in y=0, sum of moments=0 on Here are links...

My plot didn't come out correctly, so I know I did it wrong. Where did I go wrong or was I even close? 1. Homework Statement The hydraulic car lift shown in Fig 1 will be used to lift a vehicle of weight W. Determine the force in the hydraulic actuator required support the vehicle as a...

Homework Statement The crate shown is held against wedge B by a spring. The spring is 96.0% of its original uncompressed lengthl=2.75m, and the spring constant is given ask=1650N/m. The coefficient of static friction at all contacting surfaces is μs=0.150. The mass of the crate is m=22.0kg ...

I'm sort of self-teaching statics. Failing to see why when they sum moments around A, the force Fbc is coming in at an angle (and hence being multiplied by the 5/13). Can someone please clarify?

Homework Statement Find the components (a) of the reactions at E, (b) of the force exerted at C on member CDE. Homework Equations Equations are on attachment The Attempt at a Solution Okay so I am having a hard time figuring out how to obtain Reaction D without using a force triangle because...

Homework Statement A 500lb box is being pushed up a ramp which is sloped at 10 deg. The center of mass of the box is at the geometric center of the shown area. If the static coefficient of friction is 0.35 and the kinetic coefficient of friction is 0.28, what is the force P that will cause the...