Recent content by dbatten

Hi HallsofIvy, thanks for your response. I'm still quite unsure as to what a projection actually is in this context. Is there any way you could briefly explain the basic idea? Thanks

Homework Statement In R4 equipped with the standard inner product find the projection of a=(1,2,0,-1) on the plane V spanned by v1=(1,0,0,1) and v2=(1,1,2,0) Homework Equations The Attempt at a Solution Firstly I'm not sure if a is a point or a vector, which would surely affect...

Homework Statement Consider any sequence a1, a2,..., an and the nxn array of values bij = aiaj. Which terms in the array are involved in the sums L = Ʃ(between i=1 and n)Ʃ(between j=1 and i) bij and U = Ʃ(between j=1 and n)Ʃ(between i=1 and j) bij? Also, by symmetry, show that L=U. Homework...

Oh yes I got it the wrong way around. n2 = 2.5n1. Thanks for your help

Ok so I worked out that n1 is roughly 2.5n2 using the data given so can I just let n1 = 2 and n2 equal 5?

Hi Redbelly I know this thread is a year old but I'm working on the same problem at the moment. Does your hint mean that the frequency of vibration is the same throughout the wire regardless of the fact that it is a compound wire? So you can set f1=f2 and work out n1 in terms of n2 but how...