Answer to Question #86519 in Mechanics | Relativity for Joshua

Question

6.____ is the component contributions of the basis to the unit vector
a.Direction sines
b.Direction Cosines
c.Direction tangents
d.All the options

7.Find l,m,n of the vector r=2i+4jâˆ′3k
a.2√29,4√29,−4√29
b.−2√29,4√29,−4√29
c.2√29,4√29,3√29
d.2√29,4√29,−3√29

Answer 1

6. b.

Direction cosines

For more info see

https://en.m.wikipedia.org/wiki/Direction_cosine

7. The question text is distorted before the sign of k.

Depending on the sign, it's c or d.