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.
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...
Homework Statement
Does lim x> 2 (3x2+ax+a+3)/(x2+x2) exist?
If so, find the limit.
Homework Equations

The Attempt at a Solution
I've tried factorizing the denominator to (x+2)(x1), but then I don't know how to proceed on the exercise. I have seen that the limit exists...
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.
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.
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.
You can use that "thumbrule" with the right hand? As the current is going into the paper, the magnetic field would be in a clockwise direction. On the other hand, the lines would be circles in which the magnetic field is in a clockwise direction.
The "right hand rule" is used because the...
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.
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.
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...
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: 9.81ms2
Homework Equations
Ep=mgh
Ec=(mv2)/2...
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?