Recent content by Ipos Manger

1. Limit of a function

a = 15. So that means I just have to learn that by heart? Isn't there sort of a formal proof to test that? On the other hand, how do you know there's a factor in common between the top and bottom knowing that numerator and denominator are zero? Thank you for your answer.
2. Matrices and infinite solutions

Homework Statement Find h so that: -8x + -7y = 7 16x + hy = 14 has infinitely many solutions (solve this exercise with matrices). Homework Equations - The Attempt at a Solution I converted the system to matrix form, but when I try to convert it to echelon form, I get the...
3. Limit of a function

Homework Statement Does lim x-> -2 (3x2+ax+a+3)/(x2+x-2) exist? If so, find the limit. Homework Equations - The Attempt at a Solution I've tried factorizing the denominator to (x+2)(x-1), but then I don't know how to proceed on the exercise. I have seen that the limit exists...
4. How to measure copper sulfate specific heat

Homework Statement I was wondering, how can i measure the specific heat capacity of a solution? Not the exercise, just doing an experimental work to measure it. Homework Equations q=mct The Attempt at a Solution I'm lost.
5. Wave pulses velocity

Bump, really need help!
6. Wave pulses velocity

Homework Statement In the picture. Homework Equations I guess λ=cv? I'm not sure on this one. The Attempt at a Solution I don't know how the velocity and the displacement are related in this exercise. However, i do recall the graphs of displacement, velocity and acceleration in SMH.
7. Magnetic field caused by a current-carrying wire

So i just sort of "expand" the magnetic field lines until it reaches the point P? And the direction would be upwards if i draw a "tangent" to the magnetic field (which is in a curve) at that point.
8. Magnetic field caused by a current-carrying wire

You can use that "thumb-rule" with the right hand? As the current is going into the paper, the magnetic field would be in a clock-wise direction. On the other hand, the lines would be circles in which the magnetic field is in a clock-wise direction. The "right hand rule" is used because the...
9. Magnetic field caused by a current-carrying wire

Homework Statement In the picture. Homework Equations Right/left hand rule? The Attempt at a Solution I have tried applying the right hand rule to this situation, but they only give me the current and nothing else, so i can't determine the direction of the magnetic field in the point P.
10. Mass between two springs

Hey, thanks for repplying! Well i've tried to mount it vertically.. but it doesn't work. Or maybe i'm doing it wrong. Gravity makes the mass go down, but not up.
11. Mass between two springs

Hello! My second time here, and this forum has really been helpful. I got a question: How could i do an experiment to study the SHM of a mass between two springs? I've tried doing it, but the mass can't complete one cycle, and friction is always a problem. Is there a way to reduce it...
12. Lifting Books - Potential Energy

Homework Statement A student has six books, all of them with a 4cm thickness and a weight of 30N. ¿What would be the minimum work to put the books in one pile, if the six books are in a table? Weight: 30N Thickness: 4cm. Gravity: 9.81ms-2 Homework Equations Ep=mgh Ec=(mv2)/2...
13. Lifting books - Potential Energy

I need help on this proble: A student has six books, all of them with a 4cm thickness and a weight of 30N. ¿What would be the minimum work to put the books in one pile, if the six books are in a table?
14. Measuring gravitational force of the Earth

Alright.. seems to complicated, thanks anyways! I've heard also of an experiment with a spring, how does it work?
15. Measuring gravitational force of the Earth

And how could i measure g with the Atwood machine? The equation should be: a = g(m-m2)/(m+m2)