Recent content by Lothar

Homework Statement A wire lies along the piecewise linear curve extending from the point (2,2) to the point (12,4) to the point (12,9). If the density of the wire is given by (xy)=2xy+6x, use a line integral to find the mass of the wire. Homework Equations The Attempt at a Solution...

Well I'm stupid. Still though, I don't see a point on the unit circle where 2cost - sint is equal to zero.

I'm not sure. That's why I asked. When the j component is equal to zero?

Where r' is equal to pi or 2pi? Maybe? I'm kind of lost now.

Homework Statement Consider the plane z = x + 2y and the cylinder x^2 + y^2 = 1 (a) Find a vector function r(t) describing their intersection. (b) Find the points if any where the tangent to ~r is horizontal (c) Find an equation for the tangent line to ~r at each of these points.Homework...

Homework Statement See the image http://tinypic.com/r/33z6vz5/7 Homework Equations The rules of dot product multiplication. The Attempt at a Solution I've determined that 2 of the solutions are valid, while two of the choices are invalid. I thought C and D looked correct, making A...

@ ImAnEngineer I understand that that is the formula. I don't know how to use it though. And I moved this to a new topic because I new that people would back away from a long topic (my last one), and if they did click it, they would not spend the time reading all the way to my new question...

Hello everyone, I've been working on this problem for the last hour and a half. My teacher has asked us to calculate the work done by friction on an inclined plane. This is the problem: A worker pushes a crate weighing W = 95 N up an inclined plane. The worker pushes the crate horizontally...

I don't understand it. How do you use coefficient of friction?

Got it. I used the compliment of the angle given. I'll google the last part of the question. We haven't learned anything about coefficient of friction. I'll stop bothering you now. Thanks for the help.

Oh ok. The guy is pushing 86N parallel to the ground. So is it 5m*86N*sin(36.87)?

So the 86N given is not parallel to the plane?

Oh. That makes sense. The positive direction would be up the ramp, so since the gravity would bring it down then the sign would be negative. Do I need to use one of the components for part a? The given force times the given hyp or opposite side is not the correct answer.

Question: A worker pushes a crate weighing W = 95 N up an inclined plane. The worker pushes the crate horizontally, parallel to the ground, as illustrated in Figure 10-21 Picture: http://i19.photobucket.com/albums/b188/Luigio97/physics.gif (a) The worker exerts a force(F) of 86 N. How much...

Yeah the hyp was 5 meters. 5m*95N*sin(36.87) = 285