# Kinematics Problem

1. Sep 11, 2004

### shawonna23

In diving to a depth of 635 m, an elephant seal also moves 590 m due east of his starting point. What is the magnitude of the seal's displacement?

Would I just take the 590m and subtract if from 635m to get the answer?

2. Sep 11, 2004

### Tide

Pythagoras

3. Sep 11, 2004

### Sirus

Use vector addition for these types of problems. Find vectors for the two separate displacements and add them vectorally.

4. Sep 11, 2004

### HallsofIvy

Staff Emeritus
Yep, Pythagoras!

5. Sep 11, 2004

### shawonna23

would I do this?

Take the Square root of 635^2 + 590^2 to get the answer?

6. Sep 11, 2004

### COCoNuT

dont take my word for it(im not good at physics, lol), but this is how i think your suppose to do it:

x=590 (east)
y=-635 (south, cause it's diving and negative because it's south)

mag is just a^2+b^2=c^2
so... 590^2 + (-635)^2 = c^2

and direction is... arctan(y/x) = arctan (-635/590)

im trying to do as many physics problems as i can and reading over my notes agian this weekend(got a test this monday)

can anyone tell me if my work is correct?

Last edited: Sep 11, 2004
7. Sep 11, 2004