- #1

- 719

- 1

## Homework Statement

[itex]2sin(t) \vec i +5t \vec j -2cos(t) \vec k for -5 <= t<=5[/itex]

## The Attempt at a Solution

[itex]let \vec r (t)= 2sin(t) \vec i +5t \vec j -2cos(t) \vec k[/itex]

Then [itex] d \vec r(t) = 2cos(t) \vec i +5 \vec j + 2sin(t) \vec k[/itex]

[itex]|| d\vec r(t) ||= \sqrt( (2cos(t) \vec i)^2+(5 \vec j)^2+ (2 sin(t) \vec k )^2)[/itex]....?