Let`hata, hatb, hatc` be vectons of length 3,4, 5 respectively. Let `hata` be perpendicular to `(hatb+hatc), hatb` to `(hatc+hata)`, and `hatc` to `(hata + hatb)`,. Then `|hata+hatb+hatc|` is

If vector (hata+ 2hatb) is perpendicular to vector (5hata-4hatb) , then find the angle between hata and hatb .

If vector (hata+ 2hatb) is perpendicular to vector (5hata-4hatb) , then find the angle between hata and hatb .

If vector (hata+ 2hatb) is perpendicular to vector (5hata-4hatb) , then find the angle between hata and hatb .

If hata and hatb are two mutually perpendicular unit vectors what is the value of (2hata + 3hatb). (4hata - 5 hatb) ?

hata, hatb and hatc are unit vectors. If the hata +hatb = hatc , them the magnitude of hata -hatb is :

IF hata + hatb = hatc [ hata , hatb , hatc are unit vectors ] find the angle between hata and hatb .

Let hata,hatb and hatc be unit vectors and alpha, beta , and gamma the angles between the vectors hata,hatb,hatb,hatc and hatc, hata respectively . If hata + hatb+hatc is also a unit vectors, then cosalpha + cosbeta +cosgamma is equal to -