Couple Definition and 423 Threads

1. A woman at an airport is towing her 29.0 kg suitcase at constant speed by pulling on the strap at an angle above the horizontal. She pulls on the strap with a 40.0 N force, and the friction force on the suitcase is 12.0 N. (a) What angle does the strap make with the horizontal? (b) What...

the first one says: Prove that: a) |sin z | \geq |sin x| b) |cos z | \geq |cos x| Where I guess z = x+iy... What I have done: Well I am pretty stumped on this one, I have though about expanding sin z into (sin x) (cosh y) + (i cos x) (sinh y) . I don't think that helps me prove...

Hey everyone, I've been having a little trouble with a few HW questions. If you guys could point me in the direction (ie- help me find the method to solve) I would really appreciate it. The q's are: 1. The definite integral from 3 to 8 of- x^4(ln3x)dx For this one I am not sure wether I...

I am completely stuck on a couple of questions and would like a bit of help on these. First one. This I have no idea where to even start and I can't find anything on it in my text either. So maybe a formula or point me in the right direction would help.:biggrin: Calculate the fraction of...

can you please help me find a good article on all that weird stuff in modern physics? the article can be specific or general ... it doesn't really matter as long as it pertains to modern physics

Ok so I recently took a sceience test, and it was a disaster, but he's giving us the chance to retake it. The first time through, the only thing that saved my grade was my "creative" answers (my definition for farad was: "Farad Hazim was the first Arabian telemarketer to eat his own head in...

I'm having many a woes with angular accelaration in my DE Physics class. Could you guys explain to me how to do these 3 problems. (If I can get one of them by logical deduction from the other problems don't go out of your way.) Thanks. A merry-go-round accelerating uniformly from rest...

Hi, I’m having a really difficult time in physics, and I need some help on this homework assignment. Here are the questions and the work I’ve done. I really don’t know how to approach them, and at this point, I’m just kinda throwing equations at them haphazardly… 5. A 175 kg weather...

1. Mass M is sliding down the inclined part of a slide at a speed of 1.93 m/s. The mass stops a distance of S2= 2.1 m along the level part of the slide. The distance S1= 1.22 m and the angle theta= 34.70 deg. Calculate the coefficient of kinetic friction for the mass on the surface. I used...

1.) A cookie jar is moving up a 39.7o incline. At a point 0.56 m from the bottom of the incline (measured along the incline), it has a speed of 1.48 m/s. The coefficient of kinetic friction between the jar and incline is 0.15. (a) How much farther up the incline will the jar move? (b) How...

I have another thread for another problem, but no one seems to be responding about this second problem, so i'll post it here. Need to find the magnitude and direction/space angles of the resultant couple moment of two valve handles being turned, as pictured...

Okay, having some problems figuring out how to start this problem on a moment couple: http://img347.imageshack.us/img347/6939/problem55hb.jpg And the same thing for this one: http://img347.imageshack.us/img347/2488/problem64sx.jpg Any tips on how to start each one? I think I just need...

I have a general question about dipoles. Doesn't the magnitude of the electric field attain its highest values in the vicinity of the midpoint of the distance between the positive and negative point charges? This is interesting, because if you consider only one point charge, then the magnitude...

Thank you. Consider a particle moving in a straight line. Does a Large change in speed always lead to a large acceleration? Explain. For a car traveling at a given speed, there is corresponding stopping distance associated with that speed. The stopping distance is the the distance the...

I tried to write a function that would count all possible combinations that 4 couples could sit at a table assuming no man can sit next to his wife or next to another man. and 1wife and 1 husband sit at fixed positions. my problem doesn't compile and it says i either have too many or too few...

Right now I've only learned 3 equations dealing with constant accleration v_f=v_i+a_s\Delta t s_f=s_i+v_i\Delta t+1/2a_s(\Delta t)^2 v_f^2=v_i^2+2a_s\Delta s Ok first problem: A Porsche challenges a Honda to a 400-m race. Because the Porsche's acceleration of 3.5m/s^2 is...

Hello everyone, I'm stuck on some problems, This is the first homeowrk assignment and I'm pretty lost! I'm going to list the directions and show you what I have done so far, any help would be great! Here is my work to the problems: //http://img175.imageshack.us/img175/4090/4108rz.jpg...

ok this is a new subject and my teacher is just horrible, so any help will be great thanks 1. One cubic centimeter (1.0 cm3) of water has a mass of 1.0 e-3 kg. Determine the mass of 1.0 m3 of water (in kg). -I thought you would take the 1.0 e-3 kg and multiply it by 100 since you are going...

I have a couple math questions that I am a bit rusty with. I know they are probably really easy, but bare with me, as I haven't done problems like these in a while. Here we go: A man makes $75,000. He must pay federal personal income tax of 10% on the first $12,000 of his income, 15% on...

what is this problem searching for? A 25-lb force acting in a vertical plane parallel to the yz plane is applied to the 8-in.-long horizontal handle AB of a socket wrench. Replace the force with an equivalent force-couple system at the origin O of the coordinate system. See attached pic...

Hi, I have a couple general (pretty much abstract) mechanics questions, and I'm not sure I'm going the right way about doing them. Any help would be appreciated. 1)On a flat surface with friction, you have a massless spring with a spring constant (k) attached to a wall on one end, and on the...

A few trig problems that require the same thing or concept. As always I appreciate the help. 1) If Tan A=1/3 and Tan B=1/2 show that Tan(1/3 + 1/2) = 1 (Tan1/2 + Tan1/3) / 1-tan(1/2)tan(1/3) I am a little confused with this because I can't use a calculator and am confused on what...

Good evening scholars! i just had a couple of questions about QNs. ok so the problem says: Give the sets of {n, l, m, s} for the electrons in: a) 4p^2 b) 6s^2 i just want to see if I'm on the right track. here's what i put for the first one (a): n= 4 l= 1 m= -1, 0 s= +/- 1/2...

Physics 2 exam tomorrow. Need help with a couple more problems and I am good! :) 1. a circuit has a 137 mH inductor across AB (the whole curcuit is a square with corners ABCD), a 50 ohm resistor across BC, and a 25 uF capacitor across CD with a 115V @ 60 hz power source between DA. What is...

we recently started integrals over the complex plane, in complex analysis. But, I am confused on the iterpretation of some of it. From what I've heard/understand, there Is no geometrical interpretation of a complex integral. Why is this? Also, why is it 'illegal' to do an indefinate integral...

1. Two builders carry a sheet of drywall up a ramp. Assume that W = 1.70 m, L = 3.20 m, = 18.0°, and that the lead builder carries a weight of 137.0 N (30.8 lb). What is the weight carried by the builder at the rear ? I know torque and all forces add up to zero, as the drywall is not...

Hi to anyone reading this. This is my first thread on this site. I am enthusiastic and very interested in physics. Currently i am trying to understand the universe around me. I have a couple of questions id like to ask and if they could be answered that would be greatly appreciated. Personally...

Why do two objects when dropped on the floor make different sounds? (i.e, coin and piece of wood) What's a system? and please give me an example of it demonstrating Newton's First Law of Motion. How do I calculate the speed of an object that demonstates linear motion?

I have applied to a physics program (bachelor) at a university where i live. The program is "open", there are no grade limitations (it's the same most places in Norway - studying science is not that popular). But as far as I've understood, the university is good. They have exchange programs...

E = 15 i - 8 k at a point on a conductor surface, what is the surface charge density at that point? assume Eo. surface charge density is just -Eo*E correct? but i take the magnitude of the electric field and than multiply it by Eo. am i right?

A couple of electric potential "theory" problems OK, so let's say Person A is on Planet A, where the ground potential is 1,000,000 V. Person A touches an object insulated from ground at a potential of 1,000,001 V. Person B is on Planet B, where the ground potential is 0 V. Person B touches...

i have been at this time since 2 this afternoon, and I've only got 3 of 8 problems completely done. i need to get these done before i go insane. heres the first: plane x+2y=5 carries charge Ps = 6nC/m^2. determine E at (-1,0,1) okay, this is obviously a surface charge problem. and E =...

OK this problem has been giving me nonstop headaches and nightmares for over 4 days! :cry: I just can't seem to understand something here! :frown: Here's the actual problem: Suppose that you have 80 feet of fence to enclose a garden. For each garden design below, find the dimensions...

First the easy one (I think): Show that x4-22x3+1 is irreducable (is that how it's spelled?) over Q. Now the one that's giving me a headache: Suppose E/F, when [E:F]=2, and char(E)>2. Prove that there exists u in E, s.t. E=F(u), when u is a root of p(x)=x^2-a, for a in F. Tried all...

a couple of "basic" physics problems i am stuck on a couple of my homework problems for my "basic" physics class. any help with either of them would be greatly appreciated. 1. a window washer pulls herself up in a bucket-pulley apparatus (single massless, frictionless pulley). how hard must...

1. For http://www.pen.eiu.edu/~cuemc4/circuit.bmp picture.. Calculate the potential at point D. 2. I 15-V battery is connected to three capacitors in series. The capacitors have the following capacitances: 4.5microFarads, 12.0microFarads, and 32microFarads. Find the voltage across the...

For the following questions there is a club consisting of six distinct men and seven distinct women. 1. In how many ways can we select a committee of three men and four women? There are C(6,3) ways to select the men and C(7,4) ways to select the woman. For each combination of the...

Hey, this is my first week in Quantum class, going pretty well so far. My first questoin is: 1.) What is an eV a Unit of...give it in terms of MKS Well my answer is that it is a unit of energy, and for MKS... 1 Electron*Volt = Joules 1 electron has a charge of 1.602*10^-19 C 1...

First Problem ---------------- A flat plate moves normally toward a discharging jet of water at the rate of 3 m/s. The jet discharges water at the rate of .1 m^3/s and at a speed of 18 m/s. (A) Find the force on the plate due to the jet. (B) Compare it with if the plate were stationary...

A mass of 0.39 kg connected to a light spring with a spring constant of 22.2 N/m oscillates on a frictionless horizontal surface. If the spring is compressed 4.0 cm and released from rest, determine the following. (a) the maximum speed of the mass (b) the speed of the mass when the spring...

I've been thinking about the following few quotes, and each time, it reminds me of how many different ways one's thoughts can be processed. I'll give my thoughts... what do you guys think about them? "Sometimes I wonder, what's the reason why... we long for someone to embrace and say hello to...

Boredom... I'm just plain stupid... (Don't know which equations to use...) If a 256 kg spacecraft weights 436 Newtons when it is on the moon, what is the gravitational field strength (in N/kg) there? To slide a 9.0 kg object at constant speed along the ground requires a force of...

Problem Find the sum of the series s(x) = \sum _{n=1} ^{\infty} \frac{1}{2^{n}} \tan \frac{x}{2^n} Solution If s(x) = \sum _{n=1} ^{\infty} \frac{1}{2^{n}} \tan \frac{x}{2^n} = \frac{x}{3} + \frac{x^3}{45} + \frac{2x^5}{945} + \dotsb \cot x = \frac{1}{x} - \frac{x}{3} -...

1) First ones just I am curious about what's the relationship between the velocity of a liquid being projected, like out of a hose, vertically and the height it goes. 2) An actual problem: A cylindrical tank .9 m in radius rests atop a platform 6 m high. Initially the tank is filled with...

1. Why Gas turbines are placed in open atmosphere while steam turbines under roof in Combined Cycle Power Plant? 2. What are the reasons for not using the reciprocating compressors with Gas turbines other than mass flow rate? Thanks in advance!

1.) I use dial-up to get online. Windows is supposed to remember my logon name and password. It has no problem with the name, but the password it gives has twice as many letters as the correct one. I assume it is giving the password twice. No matter how many times I change the password, or make...

1) For one question, the forcing term is 8cos2x - 4sinx. I am trying to solve by the method of undetermined coefficients. The solution to the homogeneous equation is c1cosx + c2sinx so for the particular solution I was using : Acos2x + Bsin2x + Cxcosx + Dxsinx, where I added the x's into the...

Had a lab few days ago and a question was presented: Some people claim that women possesses better color vision than men. Suppose ths is true. Two people perform this experiment and their results are as follows: Student1: Acetic Acid Concentration - 4.5% Student2: Acetic Acid...

I kinda have a question and an answer check... well here's my check. Let f(x) = x^2 + x. For any readl number a, let Ty be the y-intrecept of the tangent line to f(a), let Nx and Ny be, respectivly, the x-intercept and y-intercepts of the normal line to f(a). SHow that a = 0 is the only value...

HELP! pulley problems, can't figure formula out... ok, for physics here at uf, there are 2 problems in this homework i just can't figure out, and I am sure I am just being stupid, but can anyone help me? here they are... In Figure 5-50, three ballot boxes are connected by cords, one of which...