Position vectors and magnitude

Exercise and reference answers

Questions

1. Question

   Magnitude of the position vector of P(x, y, z)

   Choices

   1. √(x² + y² + z²)
   2. x + y + z
   3. x² + y² + z²

   Correct choice

   √(x² + y² + z²)

2. Question

   The scalar components of a vector are also its

   Choices

   1. direction cosines
   2. direction ratios
   3. magnitudes

   Correct choice

   direction ratios

3. Question

   Direction cosines are obtained from ratios by dividing by

   Choices

   1. the largest component
   2. 3
   3. the magnitude r

   Correct choice

   the magnitude r

Explanation