Recent content by rzn972

For b) I say it is counterclockwise. My reasoning is that the field is decreasing as time passes (e^(-t)). The field will want to come out and the way to do that is for the induced current to flow counterclockwise. I am not clear on c). Doesn't the y variable account for the different flux...

Ahh I forgot that they gave us the length of the square. I think I was able to get it. Does this look right?

Okay so the derivative of magnetic flux is the induced voltage. I am having trouble calculating flux. Flux = BA cos (theta). How do I get the area...?

Sorry! Yeah I meant magnitude.

Homework Statement Hey everyone I have a physics e&m question: [/B] http://blob:https%3A//www.physicsforums.com/aa779f37-be23-43d7-a888-d70263a3854b Homework EquationsThe Attempt at a Solution I took the derivative to find the magnitude of the induced voltage. (do I need to add a constant...

Right, my mistake. Det(A)=0 implies linear dependence. Thanks everyone!

Okay, I think I get it. I am still a bit hazy on one part though . If the det=0, it implies that it is linearly independent meaning there are infinite solutions. I thought that if det=0 it could mean there are infinite or no solutions. When is there a case of no solutions?

Since the det is not equal to zero, it means that the vectors are independent. If they are independent it means that there are infinite solutions?

If the determinant is zero, doesn't that mean there is no solution so that "There is exactly one solution, but the system is close to having none?". The answer is supposed to be the other one, "There is exactly one solution, but the system is close to having infinity many".

Homework Statement Suppose a mass- spring is modeled by x''+ cx'+100x. What should the damping constant c be in order that critical damping occurs? Homework Equations The Attempt at a Solution I set the discriminant equal to zero so that there are real repeated roots. B^2-4ac=0...

Homework Statement For a system Ax= 0, suppose det (A)= .0001. Which of the following describes the solutions to system? There is exactly one solution, but the system is close to having infinity many. There is exactly one solution, but the system is close to having none. Homework Equations...

Homework Statement PART A only Homework Equations The Attempt at a Solution The answer suppose to be mg sin theta- t cos alpha = 0 ( Newton's law). 15g sin36.9 = t cos 30 However, why don't we need a force of static friction?

Homework Statement Homework Equations The Attempt at a Solution A) I am not sure how to go about solving this. I would say no you can't find Us. Can you just say that you do not know when the object will move? B) First I found acceleration x= 1/2 at^2, 18= .5a(9), a= 4. Then I...

Homework Statement A 16 kg block is initially at rest on a rough horizontal surface (uk= .2). The block has a small explosive charge inside it. The charge explodes, splinting the block into two fragments and adding 76.8 joules of kinetic energy. The other 10kg slides 1.47m along the rough...

Okay, so abs (change in impulse) = force *times. So I change the velocity final to -v. abs (-.06v -2.7) = 5 v= -128.3 v= 38.3 I use the positive 38.3 because I already put in the negative sign? And yeah "Assume the ball is still moving at 45.0 m/s when it is returned." confused me too... The...