Recent content by user8899

No because the vectors have to be tip to tail to add up?

Yes, that is what I meant. Do we add the two normals to get the third normal? I am really confused.

Homework Statement The acute angle between two planes is called the dihedral angle. Plane x−3y+2z=0 and plane 3x−2y−z+3=0 intersect in a line and form a dihedral angle θ . Find a third plane (in point-normal, i.e. component, form) through the point (-6/7,0,3/7) that has dihedral angle θ/2 with...

oh! okay that makes sense! Thank you everybody :)

Thanks, so for time what would I do since when you find the derivative t is no longer there?

I am really confused now. Could you give me some guidance? So the derivative is velocity right? The magnitude of the vector would be √((2)^2 + (-2)^2)? Then that would be speed which is √8? Is this right? Thanks

So the speed is 0? How do we find the time then? That's what I am stuck on.

Yea sorry it's <2,0,-2>

Ok, so I would just get <2,3,-2>. Then what would I do?

Homework Statement The position function of a particle is given by r(t) = <2t, 3, -2t+1> where t is the time in seconds. When is the speed a minimum? What is the minimum speed? Homework Equations v(t) = r'(t) The Attempt at a Solution The derivative of r'(t) = 2 + 0 + (-2) = 0. The t is...

Hi, Thank you! well I substituted <a,b,3-b-c> into the vector projection equation, but I think my problem is the algebra... I'm not sure

Homework Statement Determine the vector(s) whose vector projection on u =< 1,2,2 > is v =< 3,6,6 > and its scalar projection on w =< 1,1,1 > is √3. Homework Equations Vector Projection of b onto a: (|b.a| \ |a|) * (1/ |a|) * a Scalar Projection: (|b.a| \ |a|) The Attempt at a...