Difficulties Definition and 77 Threads

Homework Statement I want to simplify the following (these are to do with the ratio test in series): a) \frac{(n+1)!}{(2n+1)}/\frac{n!}{2n-1} b) \frac{2^{2n+1}}{(2n+1)!} / \frac{2^{2n-1}}{(2n-1)!} The Attempt at a Solution a) \frac{(n+1)!}{(2n+1)}/\frac{n!}{2n-1}...

Homework Statement A 55 g particle is moving to the left at 27 m/s. How much work must be done on the particle to cause it to move to the right at 41 m/s? Answer in joules Homework Equations The Attempt at a Solution 27-(-41)=68 , 68*55= 3750 the units here are grams m/s. I...

so i understand how to resolve a limit at x->oo, but from a conceptual standpoint, i do not get it. for example, limit x->oo, 4x/5x so the answer is 4/5, but oo/oo is an indeterminate expression i understand that if i treat x as a variable, then it makes sense, but still if the example was...

Homework Statement This is problem 2.46 from Griffith's Electrodynamics. I've already solved the problem but there is one aspect of the solution which bothers me and I can't think of where it is originating. I have found that the potential given in the problem produces an electric field...

hello everybody . i have an exam in modern physics ,about relativistic kinematics and relativistic dynamics and quantum effects . but i have some difficulties when solving problems and i'd like to work it more . so if anyone knows an interesting link or a free ebook where i can find solved...

Chain rule difficulties, due tomorrow! Homework Statement Find the derivative of y=e^square root of 1+tan(sinx) Homework Equations chain rule: F'(x)=f'(g(x)) * g'(x)The Attempt at a Solution I thought I had it and then while I was looking at other chain rules and started doubting my...

Homework Statement A soccer ball is kicked with a speed of 7.50 m/s at an angle of 30.0° above the horizontal. If the ball lands at the same level from which it was kicked, how long was it in the air? (Neglect air resistance.) Homework Equations The Attempt at a Solution I...

hey guys i am now taking the Differential Equations and Linear Algebra class, and we are using the book written by Edwards Penney. it is the 2nd edition. i feel llike this book is disorganized and doesn't explain things very well at all. anybody use the same book? can you guys give me some...

[SOLVED] Show set is open - technical difficulties Homework Statement Let C be a closed convex set in a Banach space with non empty interior. Show that cl(int(C))=C (show that the closure of the interior of C is S itself). The Attempt at a Solution Since int(C) is included in C, we have...

Hello, Celestia runs fine, except when i go to satellites ( Hubble, ISS, etc). When i hit the 'g' key it doesn't show anything for the object, instead a blackish type sphere is displayed. I'm running it on an older system: Dell GX240 2.4Ghz Pentium4 1gb DDR 2700 Geforce MX440 64MB I...

[SOLVED] Difficulties with my assignment. Need help if anyone is up to it. Homework Statement Hello. I need to rewite the formula B so that it will become formula A, step by step. I need to explain what I do every step of the way and write all the middle-calculations also. That is, so that I...

Hello! I'm having a bit of a difficulty trying to solve this exercise mostly because of the resistors. So,when short circuiting the voltage source we have the 20ohm in parallel with 40 ohm right?But what about the other resistors are they in parallel or in series with the result 20//40?The...

Homework Statement I have a lot of questions, but once I understand this I will get the basis for the other problems: Calculate the maximum speed of the 100g pendulum mass when it has a length of 100 cm and an amplitude of 50cm. Homework Equations ? The Attempt at a Solution ...

I am studying computer science and i have just finished my first year. We had a little bit of C language. Now i can grasp the theory part of the language like the syntax and the components of the language, but i can't seem to be ale to write programs. I mean i can't form the correct algorithm or...

First post and not used to the symbols that I have seen used in posting formulae, so please be patient! :smile: The probability of obtaining the ith energy eigenvalue Ei is given by the square modulus of the integral psi_i*(x)PSI(x,t)dx where PSI(x,t) is the wave function of the system...

Homework Statement Objects with masses of 200kg and 500kg are separated by 0.4m a)Find the net gravitational force exerted by these objects on a 50kg object placed midway between them. b) At what position (other than infinitely remote ones) can the 50 kg object be placed so as to experience a...

Hi all, I m having some difficulties understanding some basic concepts of thermodynamics: -What is reversibility? Ok, i understand that if after the "go" and "return" processes, the system as well as the surroundings are back to their initial state, then we can say that the overral...

Ive been wondering about time dilation, and how it effects different observers. If an observer1 is in motion, in a frame of reference relative to an other observer2 at rest, observers1 and 2's measurements of time will differ from one another, observer1 will experience a slower time than...

According to Relativity, if a ship traveling at nearly the speed of light through interstellar space diffuse atoms (mostly Hydrogen, becase simply that is the most abundant atom in the universe, right?) would strike the front of the ship with increased mass, causing radiation. My question is how...

Difficulties with dipoles & point charges... Help would be appreciated a lot with the following problems: ~ A positive point charge +Q is at the origin, and a dipole of moment p is a distance r away (r>>L) and in the radial direction as shown below...

Hello; I'm having some difficulties with a thermo question of mine. at low density water vapor conforms well to the ideal gas equation provided the temp is higher than about 320K, but the heat capacity is a function of temperature. The following formula gives the specific heat capacity at...

What are the technological difficulties faced in making a microturbine? What is the main reason due to which are still not in vogue?

I'm given the statement: if m^2 is of the form 4k+3, then m is of the form 4k+3. I don't even know how to begin proving this. I'm guessing by contraposition. I really have a great deal of difficulty with proofs in general; whether I can't see ahead in written steps, I don't know. I can do...

Hello people. I am trying to understand how the Green's functions work, and how to come up with one for a given differential equation. Now, I need to write down the Green's function for 3 different types of differential equations. They are simply, underdamped, critically...

I am having increasing difficulty with the above types of problems. Does anyone know of an easier way to understand the two types of problems?

Hey, I came across this site on one of my many google searchs on my quest to solve this problem, and was hoping someone could help me out. The following word problem is the one I am trying to solve: An object is dropped from 100 feet up. Negating wind resistance, calculate the time it took...

This is a thread to discuss problems associated with giving Iraq a republican (with a lower-case 'r'!) form of government. I will start with an article from the Orlando Sentinel...