Couple Definition and 423 Threads

Consider the drawing of the lever. Determine the value of the couple, M, so that the resultant of the applied loads passes through the point O. The applied loads include the two forces (400 N, and 320 N), and the couple M. M=400\times0.15\timescos30+320\times0.3=148(Nm) Is this equation...

Homework Statement The steel plate shown supports six 2 in. - diameter idler rollers mounted on the plate as shown. Two flat belts pass around the rollers, and rollers A and D are adjusted so that the tension in each belt is 10 lb. Determine (a) the resultant couple acting on the plate is a...

Homework Statement hello, so I've got a couple of problems I need someone to kind of check over because on one of them, I'm not sure if it's correct, and then the other looks to be incorrect. For problem 1, we have a 2\pi periodic function where f(x) = xsin(x) For the second problem, I...

Hello there! Couple questions: 1. When a battery's terminals are connected by a copper wire, why is that called a circuit? Aren't the electrons moving, as a result of voltage difference, from the anion compartment of the battery to the cation compartment in a one-way direction? The fact...

I just wrote a physics exam today and I got stumped on a couple problems that have been bugging me, and I should probably find out how they are done the right way, or at least how to set them up just in case I use them again and I don't see any examples in my textbook: The first I'm pretty...

Back for a couple more I'm having a little trouble with. The first is sech(1/x)tanh(1/x) all over x^2 Here I'm not sure how to deal with integrating hyperbolics at all as we haven't gotten to it in class yet. I did some searching on the internet and found that the integral tanh(x)sech(x) =...

Ok, I'm reviewing for my exam and I'm having issues with a few of the answers they have given... Let me know what you think. This practice exam seems a little iffy to me... There seem to be mistakes in it all over. One question asked the angular momentum of the Earth and said the answer was just...

Homework Statement Suppose there is a square plate, of side a and mass M, whose corners are supported by massless springs, with spring constants K, K, K, and k <= K (the faulty one). The springs are confined so that they stretch and compress vertically, with unperturbed length L. The...

1. An urn contains 2 white balls and 8 red balls. A second urn contains 8 white balls and 2 red balls. An urn is selected, and the probability of selecting the first urn is 0.4. A ball is drawn from the selected urn and replaced. Then another ball is drawn and replaced from the same urn. If...

Question 1: I was told here that in Case A, the torque is equal to zero. I'm not really seeing that. I know torque is equal to rFsin\theta. If I draw a vector from the rotation point (the very center of the spool) to the point where the force is being applied, I get that the force and r...

Homework Statement Hi I have a beam that is supported at one end and at the other has a point moment (couple) acting on it at the end point. I was wondering the follwing equation is correct for the moment at any point on the beam. M= Cx/L Where M is the moment, C is the force of the...

Hello. I have a couple limit problems for my homework and I'm not sure what to do with them. 1. lim x->0 of (a^x - b^x)/x = ? I see that as x goes to zero, the top goes to 1-1 which would make the whole thing zero, but at the same time the bottom goes to 0 but you can't divide by zero of...

the question is: consider that a balloon filled with 1 liter of water (1000 cm^3) in equilibrium in a container of water, what is the mass of the liter of water? what is the weight of the 1 liter of water? what is the weight of water displaced by the balloon ? what is the bouyant force on...

Hey, I'm having some difficulty calculating couple moment. i understand that \sumM = \sumFd. here's an example: it asks to resolve the couple forces. the answer is: (4/5)(60lb) = 48lb and (40lb)(cos30) \sumM = -(48lb)(4ft) + (40lb)(cos30)(8ft) Now, i don't understand why...

Which of the following is a redox reaction? A. TiCl4(g) + 2 Mg(l) D Ti(s) + 2 MgCl2(l) B. NH3(g) + CO2(g) + H2O(l) NH4HCO3(aq) C. NaCl(s) + NaHSO4(s) D HCl(g) + Na2SO4(s) D. NaOH(aq) + H3PO4(aq) NaH2PO4(aq) + H2O(l) E. None of the above Is it A? Also another q. The primary reason for...

Homework Statement http://i124.photobucket.com/albums/p27/lollipopgourmet/untitled.jpg If the couple has a magnitude of M, determine the magnitude F of the couple forces. Since this is an X-Y plane, I assumed the equation would simple just be M=Fd, where I know the moment, and just have...

New to forum and having major problems with couple problems! 1)Two cars are towing a housing unit to a new location. The sum of the forces vector F A and vector F B exerted on the unit by the horizontal cables is parallel to the line L, and FA = 3200 N. Fa(angle)=48, Fb(angle)=32 Determine FB...

ok if you could just tell em if this sounds alright. (i) A large horizontal sheet of surface charge density \sigma has a hole of radius b cout out of it. Find the electric field directly above the centre of the hole. I already have expressions for the electric field due to the sheet and...

Hey everyone, I'm really stuck on a review of statics for Solid Mechanics. I got through everything but this problem. I know there has to be two forces at point a if it's attached to the wall(Ax,Ay). I would say I'm stuck trying to figure out how I can move two forces that are unkown into a...

A couple of physics questions on helmets!? 1. Why is the impact force reduced for a helmet with a soft interior vs.a hard interior? 2. How is the safety reduced if the helmet does not fir properly? 3. Once a helmet has been involved in a collision, it should be replaced. why? 4. What...

Homework Statement 1) The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person's eyes and the building is d = 68.0 m. In part a the person is looking at the base of the antenna, and his line of sight makes an angle of θ1...

Homework Statement I have a table with a data set #, and 2 variables (W and P) with values in the table. Homework Equations The equation (which I don't know what it means) says V= (summation with n on top and i=1 below Wi X Pi)/(summation with n on top and i=1 on bottom X Pi) The...

1. If gravity waves travel at the speed of light and it take about 8.5 minutes for to reach Earth from the sun, If the sun suddenly collapsed into a black hole would it take 8.5 minutes for us to start being pulled in? 2. If you could somehow set up 2 mirrors facing each other than...

Homework Statement 1.) 3logx2y + 2logxy 2.) 4logabc - 2loga2b - 3logbc Homework Equations The Attempt at a Solution I know that 3logx2 is the same as 6logx but I don't know what to do since there's a y there

Homework Statement 1.) a.) If the roots of equation px2 - 4x + 1 are equal then find value of p b.) Prove that the equation (k - 2)x2 + 2x - k = 0 has real roots (upside down A symbol) k E R Homework Equations The Attempt at a Solution I just don't know how to approach these...

I was just wondering, what math is needed to fully understand the mathematics of general relativity, quantum mechanics, and string theory? Can you be specific in naming them? For example General Relativity Algebra Calculus I know there has to be more than that but that was an example...

I know the formulas for coordinate geometry of the straight line and I've done a fair bit of it but I have trouble when it comes to converting equations into lines with coordinates. Heres an example of a question I can't answer L is the line 2x - 3y - 7 = 0. Verify that the point a(-1,-3)...

I have a couple of questions about the standard model: 1.) I read somewhere that the standard model describes 3 closely related Yang-Mills systems, but i thought yang-mills systems were non-abelian whereas U(1) is abelian. So is the statement false or have i misunderstood? 2.)Why do i see...

I need help with some physics questions. (Grade 11 Physics) Any help appreciated... 1. Assuming that the effective force of friction is 225N, what is the minimum work needed to push a 1.00 x 10^3kg car 45.0m up a 12.5 degree incline? 2. A 2.20kg pendelum has a period of 4.0 sec a)...

Can you give a couple of examples of chemical energy?

I am no scientist, nor did I stay at a Holiday Inn Express last night. I have been trying to understand this theory for a while, but it seems that my questions never get answered in what I read. Either that, or I am just too stupid to get it. As an example, I have been reading "The Dogschool...

Homework Statement a satellite is orbiting the Earth in a near-polar orbit. it's orbital height is 500km. the satellite carries a nadir-viewing push-broom scanning imaging instrument with 4 spectral bands. for each spectral band, the detector array consists of 1024 detector elements. the width...

First one (to check with others on whether or not it's correct, although I'm sure it's very easy) Homework Statement A vector makes an angle, theta, with the horizontal. The horizontal and vertical components of the vector will be equal in magnitude if angle theta is Four Choices (1) 30...

I'm real rusty on my physics, but here are five simple sample problems we were given, I'd appreciate your help in helping me solve these. Thanks! Homework Statement (1) A single horizontal 10.0 N force, F acts on a 2.0 kg block which is initially at rest at x=0 m. In response to the force...

Homework Statement A 63lb force F and 560lb in couple M are applied to corner A of the block shown. Replace the given force-couple system with an equivalent force-couple system at corner DHomework Equations The Attempt at a Solution I actually solved the problem but I had to guess and check. I...

Homework Statement The 140-lb uniform steel plate ABCD is welded to shaft EF and is maintained in the position shown by the couple M. Knowing that collars prevent the shaft from sliding in the bearings and that the shaft lies in the yz plane, plot the magnitude M of the couple as a function...

I've been fascinated by the posts and discussions here about "The Bounce" that seems to be emerging from some LQG models (thanks Marcus and others). I have a couple of questions, which I don't think I've seen in posts here (my apologies if they've been raised and discussed and I've missed it)...

Homework Statement Question 1:During a walk on the Moon, an astronaut accidentally drops his camera over a 13.8 m cliff. It leaves his hands with zero speed, and after 2.2 s it has attained a velocity of 3.3 m/s downward. How far has the camera fallen after 3.9 s? Question 2: A stone is...

Homework Statement 1)If either |z|=1 or |w|=1,prove that |\frac{z-w}{1-\overline{z}w}|=1 2)If z1,2,3, are complex numbers and \frac{z_2 - z_1}{z_3 -z_1}=\frac{z_1 -z_3}{z_2-z_3} Show that |z2-z1|=|z3-z1|=|z2-z_3| 3) Find the sum of the following series: nC1sinx + nC2 sin2x...

Suppose I am pulling on a cart at a constant velocity, what is my net force. Is it zero? If I throw a baseball in the air, neglecting air resistance, what does the ball experience when it comes out your hand and before it hits the ground? does it experience it's weight and also a decreasing...

Hi. I've just started learning about quantum mechanics, and I find the whole subject very interesting. I have read about the double-slit experiment, and I didn't understand a couple of things. Assuming one were to fire one particle at a time at the diffraction slit: - will all particles pass...

I have reduced the problem involving different forces and a couple in a 2D plane to an equivalent force-couple system. The force F is -27.5lbi + 11.65lbj, and the couple is -66.8inlbk. I need the single offset resultant that accounts for the couple. The way I thought to solve it was to take...

I have a couple of questions. Currently I'm a second year Mechatronics Engineering student at the University of Waterloo in Canada and I'm doing horrible. It's the more technical courses that are constantly screwing me up so I've decided to switch into physics. Now I've read the "So you want to...

Hello everyone, I have couple of online homework questions and I am not asking anyone to help me do the work. I will post the question and my answers to them and I would just like someone to verify if the answer is indeed correct because I only have one chance to submit my homework...

A couple of bothering questions! Alright docs, I've got the following couple of questions: 1- Is there any way (symptoms etc.) to judge whether a person masturbates or not? 2- I have a problem that one side of my body is different from other side. Is like this that one side of my body is...

Is there a better way to write this: g(x, n) = D(\frac{x}{n})*(n) Where D(h), unless already a decimal, expands h into a sum of its places i.e. 47=40+7, then subtracts all of the terms that are greater than or equal to one. Also, if I have a function, say f(x) = \sqrt{x}, and I only...

1. A led cylinder hangs on a string. By another string, another cylinder is hung on the previous cylinder. If you pull fast enough, the lower string tears, if you pull slowly, the upper one tears. How does one explain this? I tried to explain this with the help of Newton's second law, but I...

Homework Statement A person in a rowboat crosses a river which flows with 2.147 km/hr. The person rows with maximum velocity of 6.835 km/hr relative to the water (measured while rowing on a still lake) and wants to reach the opposite shore directly across from the start point - along a line at...

I have seen in one paper that photon is coupled to dilaton field which is scalar and motivated by string theory. I do not understand this. Photon is carrier of electromagnetic field and so I thought it can only couple to electrically charged fields. Can anyone explain?

I need to write the half equation for the S2O32-/S4O62- redox couple but I'm having trouble because they have the same ioic value. I've come up wth two solutions but am happy with nether... S2O32- + 3H2O + S2= S4O62- + 6H+ + 6e- or 2S2O32- = S4O62- + 2e- I know that the second one...