Recent content by pearss

oh i see. There is in fact another way (using geometry) but i was being stubborn and trying to force the double integrals. Thank you for the help sir :D

Homework Statement I'm doing work finding the centroids of 2d graphs. I'm working these problems using double integrals of regions that are horizontally or vertically simple. To do this I have to be able to convert line equations from one variable to the other. Some are simple but others...

so if i find the value for t1 to be 3 and the value for t2 to be 3 and they satisfy all equaitons for x, y and z then these lines collide because both "t" values are the same and all intersections are the same?

Homework Statement Determine whether r1 and r2 collide or intersect: r1(t) = <t^2 + 3 , t + 1 , 6t^-1 > r2(t) = <4t , 2t -2 , t^2 - 7> I am completely lost in this problem and was hoping for a just a hint at where to begin. I'm unsure what it even means if two lines collide or...

sorry, reviewing my post i found my mistake.

Homework Statement ||V|| = 2 ||W|| = 3 angle between vectors = 120 degrees V(dot)W = -3 Find ||2V+W|| Homework Equations Cos120 = V(dot)W / ||V|| ||W|| V(dot)V = ||V|| ^2 W(dot)W = ||W|| ^2 The Attempt at a Solution instead of solving for ||2V+W|| i instead try...

Thanks for the comfirmation nvn

Homework Statement I have a force in three dimensions such that: F=600N Alpha(angle with x axis) = 120 Beta(angle with y axis) = 60 Omega(angle with z axis) = 45 I'm to find the projection of F along the y axis. The Attempt at a Solution I found the force vector for this force by...