Relationships Definition and 155 Threads

Why does the Moon keep the same face toward the Earth but the Earth not keep the same face toward the Sun?

I've been trying to think of a really good experiment in which the data gathered would be non-linear. The only ideas I've managed to come up with were either way to simple and boring, or way to hard for me to set up and measure accurately. Some examples of experiments include splash radius of a...

Hi, I am currently a Bachelor student in Physics, and I am planning to pursue an academic career. If everything works out as planned, I am going to obtain my Bachelor degree in the summer and my Master degree 2 years later. Sometimes, when I look ahead with this plan in mind, I wonder...

Heads up... according to my TV's program guide, "The Big Bang Theory" is repeating "The Friendship Algorithm" tonight. That's the one where Sheldon comes up with a flowchart to guide him through cultivating a prospective colleague, and gets stuck in... oh well, see it for yourself if you haven't...

Other than sex, children, and legal stuff(if married), of course.

Homework Statement I need to find the relationship between object-lens distance and image-lens distance for a lense(converging) but cannot graph the relationship in a way that the focal length is the slope for the graph Homework Equations 1/u + 1/v = 1/f where u= object lense distance...

Homework Statement Formalize (in PL) the relations/predicates stated in (a)-(e) using just these relations/predicates: 1) Pxy: x is a parent of y 2) Fx: x is a female 3) Sxy: x is a sibling of y (a) x is an uncle of y (b) x is a great-aunt of y (c) x is an aunt (d) x is a great-uncle (e) x...

Hi everyone, I'm struggling to get my head around the convention of internal moments and shear forces of a loaded beam. I just can't seem to make any sense of why F is facing upwards and F+dF is facing downwards. It's driving me absolutely insane. Surely both of them will be facing upwards...

Im working on the conclusion for my lab report, and rather than plagiarize the work like most I know, I am trying to write it myself. I've spent probably between 30-40 hours on it so far, so don't think I am trying to cheat or get ahead here. But I need to describe relationships of density to...

ive noticed that education of guys who i want to date is the first thing that i usually notice about them. so how about you people? do you consider education of your partner as an factor or you are one of those people who even don't know whatever their partner is studying or what his work is .

http://img40.imageshack.us/img40/8591/ques.png [/URL] a(t)=dv/dt v(t)=dx/dt I thought it was just v(t)= (alpha)t^2/2 + w x(t)=((alpha)t^2)/6 + wt + a But the answer is ((alpha)t^2)/6 + wt + a - 2w - 4(alpha)/3 Can someone please explain this to me...

it is suspected that cells in a sample are dividing so that the number of cells present at anyone time t (measured in seconds) is growing exponentially according to the relationship y = 64 x 2^2t. it would be hard to check this relationship accurately by plotting measurements of y against t, so...

http://news.bbc.co.uk/2/hi/americas/8080239.stm Does this implies that US (or any other nation) thinks that its diplomats should even talk (informally/formally) with their counterparts who are from enemy nation? This looks quite immature to me that if I find some differences with...

I'm trying to learn SQL, specifically for SQL server. One question I have is about defining relationships. I know how to build a relationship graphically (showing that the primary key from one table is the foreign key of another), but I'm not sure how to assert the relationship with an...

Someone mentioned in a thread recently they they had a dream about something happening on PF. It got me wondering, is this common? Do you dream about PF? Do you dream about the relationships that you have online, the way you dream about person-to-person relationships? If so, what form...

Hi, I need help with this: Let V be a vector space (V may be infinite) and let W be a subspace of V, if "B" is a vector in V that doesn't belong to W, prove that if "A" is a vector in V such that "B" exists in the subspace WU{A} then "A" exists in the subspace WU{B}. I also have a...

I am trying to find out about the relationship between current and voltage in: a) filament lamps b)semi-conductor diodes c) a metal conductor at constant temperature d) a solution of copper (II) sulphate using electrodes. I pretty much know the results I am supposed to get, but could...

Homework Statement Figure 4.46 shows the second derivative of h(x) for -2 \leq x \leq 1 a) Explain why h'(x) is never negative on this interval. b) Explain why h(x) has a global maximum at x=1 c) Sketch a possible graph of h(x) for this interval. I realize this is probably a fairly...

moved... moved to the calculus forum

http://www.funnyordie.com/videos/da06f4eb0e/kitten-still-loves-puppy-from-zackscott

Homework Statement An object of mass m1 on a frictionless horizontal table is connected to an object of mass m2 through a very light pulley P1 and a light fixed pulley P2 as shown below. (a) If a1 and a2 are the accelerations of m1 and m2, respectively, what is the relation between these...

Homework Statement Styrene is a Hydrocarbon. If 0.438g of Styrene is burned in Oxygen and produces 1.481g of CO2 and 0.303g of H20, what is the empirical formula of styrene? Homework Equations The Attempt at a Solution No. of moles of CO2 - 1.481g / 44.0107g/mol = 0.0337mol No...

Homework Statement when doing work on something how does work relate to the gravitational potential energy that it acquires? Homework Equations The Attempt at a Solution

I did a pendulum lab and determined that length affected the period. So the values got where: 10 cm = 6.47 s 15 cm = 7.895 s 20 cm = 8.94 s 25 cm = 9.89 s 30 cm = 10.5 s 35 cm = 11.905 s With these values, it seems like graphing this straight as it is results in a linear line, but I...

http://www.breitbart.com/article.php?id=upiUPI-20071011-122541-6886&show_article=1

First of all, I just want to take the time and thank anyone who helps me with this, it is greatly appreciated. Homework Statement We take a mounted slingshot where you can adjust the launch angle and pull the rubber band back to a set position that is the same everytime. We launched it...

Money is a very powerful and quantitative tool to measure relationships. Here's my logic. Your loved one is sick and about to die. The doctor says, there is a medicine which would cost you $5, can save his/her life or extend the life for one more year. I'm sure most of us would buy the...

Given S is set for all real number. A is set for all even number, B is set for all positive integer, C is set for odd number represent the relationship between the sets with Venn diagram. This question is seems easy. However, there is a problem that how can we illustrate the three sets in...

After much thinking I am trying to get a help from the board. Sorry for being naïve and thank you in advance for your answers. Suppose you have to arrays made up of zeros and ones a=(1,1,0,1,0,0) b=(1,0,0,1,1,0) and a logic relationship to compare the elements of the two arrays in a...

What's the correct way to state the relationship between these two Lie groups? One is the "covering group" of the other, right? Okay, then - what's that mean, to a non-expert? I know the basics, i.e. SO(3) can be represented by rotation matrices in 3-space, and U(2) does the same in a...

what is the meaning of orthogonal relationships in addition to right angles in the xyz coordinate system? for instance, if a 3 piece rocket separated in space in an orthogonal way...will there be any significance when compared to the 3 piece rocket that does not separate in an orthogonal...

Relationships between thinking, logic and deductive reasoning .. I have to admit that philosophy is normally not "my thing" and that the reason that I found this wonderfull forum was that I was searching for something about physics and technology. My idea was/is to collect some central...

Let b be the vector such that B = [A b] , and let a1, a2, a3 and a4 be the columns of A. Let m be the number of linearly independent columns of A, let k be the number of parameters (free variables), and let n be the total number of columns in A. In our example above, n = 4. Do you suppose...

Years ago people knew each other in their street/road whatever, but now if some one new buys a house in your local, you may never meet/socialise with them, it is sad that people do not interact as they used to.

Homework Statement An inertial frame R in which the particles’ positions and velocities are related by A1= - m2 (A2) / m1 V1 = - m2(V2) / m1 at time t = 0. Show that these relationships persist at all subsequent times. Homework Equations The Attempt at a Solution...

Suppose that we choose an inertial frame R in which the particles’ positions and velocities are related by A1= - m2 (A2) / m1 V1 = - m2(V2) / m1 at time t = 0. Show that these relationships persist at all subsequent times.

Does thermal conductivity have any connection with heat transfer coefficient? If so what is one in terms of the other.

Ok, so as part of a lab, I had to make an excel graph of the relationship between skid distance and cone length (if you want to know more, look at my post below about science fair which was posted yesterday at 6:25 pm). Anyways, I made the graph and I can't tell the relationship between the two...

Can somebody take me through the steps of solving this problem? http://img56.imageshack.us/img56/7987/anglerelationships13ot.jpg I just want to know how to do it. This is the appropriate forum right? Kind of lost here

1) In the basic probability theory the concepts of mutually exclusive events and independent events share prominent roles, can two events be both mutually exclusive and independent at the same time? 2) What are two vital concepts and the relationship between "Critical Value Method" and the...

So, I had a question for all of you, regarding the relationships between area and circumference, and surface area and volume. For the longest time I was confused as to how these two quantities were related. I saw that the derivative of the area of a circle was equal to its volume, but then...

Question 3 A toy rocket is fired vertically upwards with an initial velocity of 29.2 ms-1. Calculate how long (in s) the rocket stays in the air before it returns to the ground. s=? u=29.2 v=0 a=-g t=? i've used t=(v-u)/a and then multiplied the answer by 2 is this the correct method...

Physics Help?? In an AC circuit write down the voltage (V) versus current (I) relationships for a resistor, a capacitor and an inductor in terms of agnular frequency (w) and the resistance (R), Capacitance (C) and inductance (L), respectively. From this define capacitive reactance and inductive...

Linear Systems 1 . Use your graphing calculator and linear regression to find the best fit line for each of these data tables . A ) x 1.5 0.8 3.5 8.5 6.8 7.5 Y 7.0 5.9 11.9 24.5 21.5 22.5 B ) x 12 9 3 11 7 2 Y 8 45 120 20 70 133 2 . Two large tanks are sitting next to one...

I have to do an assembly on receiving to 15 year olds this friday. the title of the assembly is Receiving and Relationships. Has anyone got any ideas on what i can do, to make it as interesting and fun as possible? i would also like some quotes or philosophy i could use to end the...

In Dawkin's book "The Selfish Gene", he discusses genetic relationships in family lines (e.g., your genetic similarity is 1/2 that of one of your parents, 1/4 of your grandparents, etc.). He mentioned that going back only a few generations, your genetic similarity to your family line is no...

The lists below show the relationship between value of x, y & z. List A, x: 3, 6, 9, 12, 15,... List B, y: 28, 26, 24, 22, 20,... List C, z: 10.5, 10, 9.5, 9, 8.5,... Find a) a fomula for z in terms of x and y, b) the nterm of each sequence. I can see the pattern in A, B & C but i just...

The Sun has effect on its Planets (and vice versa). The Planets have an effect on their Moons (and vice versa). Do nearby Stars effect the Sun (and vice versa)? If this is true, how large of an effect could there be? What would be the cause of the effects? Would it have anything to do...

This is by far the most exciting site on pi and phi I have ever seen. You must see this. http://goldennumber.net/five(5).htm Don't forget to see the side links to other pages in the site that describe other interesting facts.

Hi. Could someone please post a quick summary of which string theories are out there and how they relate to each other? I could only find partial information on this... Thank you.