Homework Statement
Figure 12-61 is an overhead view of a rigid rod that turns about a vertical axle until the identical rubber stoppers A and B are forced against rigid walls at distances rA = 7.0 cm and rB = 3.2 cm from the axle. Initially the stoppers touch the walls without being...
Homework Statement
The attached solution was given as an answer to a simple truss problem in my sophomore level Statics class. We were to solve for the forces in each member of the truss, using the method of sections for FE and BC, and by joints for the rest. The Hibbeler 12th edition we...
Homework Statement
A weight of 10 N is hanging from the top of a three-legged support. The legs are attached to the horizontal floor and form equal angles with each other. Find the forces in the legs, if they form an angle of 30 degrees with the rope.
Homework Equations
\sumFx=0...
Homework Statement
a block of mass m resting on a 20° slope. The block has coefficients of friction µs = 0.80 and µk = 0.49 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging block of mass m2 = 2.0 kg.
What is the minimum mass m that...
ok, i don't know why, but this question has been baffling me since morning
we have two supports both with reactions in x- and y-directions (in 2D), and one external load. now i have tried this with two sets of variables, but the problem i am facing is that in both cases i am getting different...
Hello I sometimes have difficulty determining weather a problem is solvable or have trouble gauging the difficulty of a certain approach.
I think this is because of a weak background in maths
Say you had a general 2d single rigid body problem
Which has 2 given forces and 3 unknowns...
Homework Statement
Homework Equations
I think that I need to find the moment of the force F about the line BC first.
Then, using that moment, find the "projection" of M_{BC} onto the X axis to find the answer. M_{BC}\sin \left(45^{o}\right)
However, I am not getting anything...
Homework Statement
The cup shown in the picture is filled with 6 oz of coffee. The center of gravity is located at G. If a vertical force is applied to the rim of the cup a shown in the picture, determine its magnitude so that the cup is on the verge of tipping.
Homework Equations
sum...
Homework Statement
The pipe assembly shown in the picture supports the vertical loads shown. Determine the reactions at the ball and socket joint (point A) and the tension in the two cords BC and BD.
Homework Equations
Sum of Forces = 0
Sum of Moments = 0The Attempt at a Solution
I first...
Homework Statement
A 0.5 x 0.8m gate AB is located at the bottomof a ank filled with water. The gate is hinged along its top edge A and rests on a frictionless stop at B. Determine the reactions at A and B when cable BCD is slack.
Homework Equations
Fx=0
Fy=0
The Attempt at a...
Statics Homework help -- find tension
[b]1. In Figure P4.111 determine the tensions in cables BC and BE. Neglect the weights of all members and assume that the support at A is a ball-and-socket joint. The 5200-N force has no x component.
(picture is attached below)[b]2. \Sigma Fx = 0
\Sigma Fy...
Homework Statement
A floor jack is used to support a 2000 lbf load. Calculate the pressure exerted on the hydraulic fluid by the piston H if the piston has a diameter of 2 in. SHOW ALL WORK AND FBDs. Note: CDE is a solid, continuous member.
*I attached the diagram****
Homework Equations...
Homework Statement
This is for Statics and mechanics of materials 1...
In this project, we were tasked with the re-design of a cheap thermal switch that is to be a component of a low cost product. The switch consists of three metal strips that are bounded on the top and bottom by a rigid...
1. Homework Statement :
If the resultant force acting on the bracket is required to be a minimum, determine the magnitude of F1.
I understand how to solve problems like this, I just don't understand what it means when it says that the force is required to be a minimum. Any help would be...
Homework Statement
A rectangular plate is acted upon by the force and couple shown. This system is to be replaced with a single equivalent force.
a) for a(alpha)=40 degrees, specify the magnitude and the line of action of the equivalent force.
b)Specify the value of a(alpha) if the line of...
Homework Statement
For the attached problem, I'm asked to solve for X
Homework Equations
Sum Fx = 0
Sum Fy = 0
Sum M = 0
The Attempt at a Solution
Sum Fx = 0 = No forces in x
Sum Fy = 0 = F1 + F2 - F3 = 0
Sum M = 0= (F1)(X) - (F2)(L-X)
Homework Statement
I am in my second year of mechanical engineering.
This is a statics problem i would like help starting
http://img230.imageshack.us/img230/9501/hw1z.jpg
Homework Equations
The Attempt at a Solution
I know I need to calculate the force time distance but...
I have a diagram below for the problem...what I am trying to understand is when the moments are found about point A as they are in the solution...the 800N force downward is considered positive and the Cy reaction is considered negative...and the Cx is considered positive...
What confuses me...
The problem statement:
My relevant equation:
\phi will be the angle between the X axis and F_{CO}
\theta = \phi + \arcsin\left(\frac{3}{5}\right)
My attempt at a solution:
\Sigma F_{x} = 0:
F_{CO}\cos\phi - F_{BO}\frac{4}{5} = 0
F_{CO} = \frac{F_{BO}\frac{4}{5}}{\cos\phi}
\Sigma F_{y} =...
http://img10.imageshack.us/img10/8880/capturejfu.jpg
I did arctan(12/5) to get the degrees + 180 to get the angle from the X axis to B, then I just split the angles into components.
I did 100*cos(246) + 100*cos(theta) = 0, and I got 67 degrees.
Then I was doing the Y components, and realized...
Homework Statement
It is known that a force with a moment of 960N*m about D is required to straighten the fence post CD. If d=2.8 (already replaced), determiethe tension that must be developed in the able of winch puller A o create the reuired moment point D.
Homework Equations
W=Fd...
STATICS PROBLEM! Need urgent help!
Hi boys(and girls),
I got stuck at a few questions of statics, and since I have to send the correct answers TONIGHT... I tried them all, but some answers I just don't know...
Please help me with the following problems, which are displayed in the...
Okay, i posted a picture of the problem above, sorry if blurry, do not have scanner. i will retype problem,
The mass of block A is 250 kg. Block A is supported by a small wheel that is free to roll on the continuous cable between supports B and C the length of the cable is 42 m. Determine the...
Homework Statement
Here is a horrible diagram representing the problem:
The problem is to find the minimum coefficient of static friction between the ball and the wall so that the ball remains motionless.
Homework Equations
torque = r*F
The Attempt at a Solution
I've divided the tension...
I need help on the first problem of this worksheet. I cannot figure out what I should include in the moment equation (M=Fd)
advice would be greatly appreciated.
https://moodle.uncc.edu/file.php/19847/Section_002/assn4_002.pdf
Homework Statement
The uniform work platform, which has a mass per unit length of 28kg/m, is simply supported by cross rods A and B the 90-kg construction worker starts from point B and walks to the right. At what location S will the combined moment of the weights of the man and platform...
Homework Statement
My question is about the method used for calculation.
The problem reads:
There is a steel pipe of uniform size and density at a length of 31 ft. It's weight is 81 lbs. It is hung from a concrete deck with five concrete hangers. Measuring from one end of the pipe, the...
Homework Statement
Two cables are used to secure the overhang boom in position and support the 1500N load. If the resultant force is directed along the boom from point A towards O, determine the magnitude of F_C(FsubC), F_B, and the resultant force, F_R. Set x= 1 and z= 4 .
Homework...
Hi everyone,
I’m not 100 percent sure if this is the right section for this question but I guess I will find out very soon.
I have come across some new material as part of my undergraduate engineering course relating to engineering mechanics, in particular truss analysis using the method...
Case closed. :)
Well, I've got quite a few questions I couldn't solve. I'd love to be pointed in the right direction, because there are some problems I just don't know how to approach at all.
This is just the first batch, I'll be adding a couple more in a while.
I've attached a link to...
So I'm totally stumped on how to start this problem. Anyone want to give me some clues.
Thanks,
Homework Statement
Find V,F, & M at points P and Q. Show direction. Answer: 13.3, 750, 1000, 290, 877, 700
Homework Equations
This is problem #3 on the attached document.
The...
Homework Statement
At ground level in Colorado Springs, Colorado, the atmospheric pressure and temperature are 83.2 kPa and 25 C. Calculate the pressure on Pike’s Peak at an elevation of 2690 m above the city assuming an adiabatic atmosphere.
Known
Patm = 83200 Pa
T0 = 25° C
z-z0 = 2690 m...
Homework Statement
Homework Equations
Nil
The Attempt at a Solution
Why does the bar y have a factor of 0.5 for the forumla of area centroid?
Thank you very much!
Homework Statement
Homework Equations
F = uR
The Attempt at a Solution
I don't understand the followings:
For equilibrium at A, the equation should be F1 = T sin \theta. Am I right?
While for the one at B, the equation should be F2 = T sin \theta. Am I right?
In...
Homework Statement
A solid sphere and a hollow sphere of same radius and same material are dropped from the top of a beaker filled with water. The height of water in the beaker is 'H'. Which sphere will reach the bottom of the beaker earlier and why? (Neglect any viscous force)
Homework Statement
http://img512.imageshack.us/img512/2617/staticsquestion4.jpg
Homework Equations
- Ability to resolve forces into components
- M = Fd
The Attempt at a Solution
(a)
Resolve the force acting at an angle into components...
10kN force = -10cos50i - 10 sin 50 j...
Homework Statement
http://home.exetel.com.au/peleus/EIDEprob.jpg
2. The attempt at a solution
Basically did the standard sum of moments around point A to try and get the vertical component of point D.
-6.2*997 + 9.2*Dy - 12.4*1472
Dy = 2655.89
From there working out Dx...
Homework Statement
The tension in the tow rope pulling the car in Newtons is 2 500N. Determine the minimum length of the rope l, between A and B, so that the tension in either AB or AC does not exceed the tension of 3 200 N.
Homework Equations
Fy = 0
Fx = 0
The Attempt at...
Homework Statement
A man, of m = 70 kg, walks along a thin rigid plank, of M = 210 kg. The plank sits on the roof of a 10 story building and is placed so that its center of mass sits directly on the edge of the roof.
Where, along the plank, can the man move before the plank tips over the...
Homework Statement
QUESTION 3
Assume that the pulley at A is a small frictionless pulley. The cord AB, and the cord supporting the block are made from the same cord.
Determine the maximum weight rounded down to the nearest Newton of the block that can be suspended in the position shown if...
Homework Statement
http://i42.tinypic.com/b4jp6c.jpg
Homework Equations
\sumFx=0
\sumFy = 0
\sumMa=0
The Attempt at a Solution
I stuck don't kno what to do
Homework Statement
see attachement
Homework Equations
sum of Fx=0
sum of Fy=0
sum of M=0
The Attempt at a Solution
There are 4 forces that I have found. 12W acting in the negative y direction at A. 3W acting in the negative direction acting 2 feet from pt B. A F acting in the...
Homework Statement
I got a problem solving this question.
http://img228.imageshack.us/img228/7049/image164.jpg The Attempt at a Solution
Im not sure if I am missing a rule here. I take CW to be positive and CCW to be negative.
But my attempt to solve it failed =[...
Homework Statement
Ok, Let's see, this problem consists of two (2) cars with a cable of unknown tension between them.
The first car has a weight of 2100Kg and is at an angle of 10 degrees from the normal.
The second car weighs 1360Kg and is at an angle of 26 degrees from the normal...
Homework Statement
#16Homework Equations
F=kx
and sum of all the vertical and horizontal forces each has to = 0The Attempt at a Solution
Because each end of the spring is like a pin it has an opposing force of 175/2 N on each end to balance out the 175N being pulled in the middle.
So I took at...
Homework Statement
Two forces P and Q with respective magnitudes 100N and 200N are applied to the upper corner of a crate. The sum of the two forces is to the right (+x direction) with a magnitude of 250N. Find the angles that P and Q make with their sum - that is, with the horizontal line...
Homework Statement
How do i know how to calculate it properly ? Like i Know M=Fd but, how can i tell if its positve counterclockwise or negative clockwise. Expecially when you have components.
Something Like this that's broken into compoents how can i calculate the moment ? I am totally...
Ok, I've come across this problem in fluid statics, but seem to be getting the integration wrong:
"A semicircular plane is submerged vertically in a homogeneous liquid with its diameter d at the free surface. At what depth s is the centre of pressure?"
The answer should be
s = (3*pi*d)...
Problem Statement
A steel shaft 120 mm in diameter is supported in flexible bearings at its ends. Two pulleys, each 500 mm in diameter, are keyed to the shaft. The pulleys carry belts that produce the forces shown. Determine the internal forces on a vertical section through point A.
I've...