# Homework Help: Find the magnitude of resultant of OA, OB and OC.

1. Jun 17, 2011

### devvaibhav

1. Find the magnitude of resultant of OA, OB and OC ( there is an arrow sign upwards of OA, OB and OC showing these are vectors.)

(Sorry but i am not good at making computer drawings.)

3. The attempt at a solution

I tried to find the resultant of OA and OC and then the angle of resultant with OA but the whole thing turned out to be a mess. please help me in it.....

2. Jun 17, 2011

### Redbelly98

Staff Emeritus
Please show what you tried, then we can help figure out how it is wrong.

3. Jun 17, 2011

### devvaibhav

i have cut that solution by pen..should i scan that and upload it?is that ok??

4. Jun 22, 2011

### devvaibhav

plz someone reply it...there is no need to scan and upload my solution as i know that whatver i have done is totally wrong as the angle b/w resultant of OA and OB was in points( i had to calculate it via calculator)...plz some one reply me....You might consider me fool bocz i am telling my attempt wrong bcoz of only the angle was in points.I knw it was wrong bcoz in the book, there is no question who has angle in points..So i think my attempt is incorrect.......

5. Jun 22, 2011

### RTW69

Vector A: ri
Vector B: rcos45i +rsin45j
Vector C: rj

Add vectors together. Redraw. Use trig to find magnitude and direction of resultant vector

6. Jun 22, 2011

### Redbelly98

Staff Emeritus
Sorry for not responding sooner, devvaibhav. As RTW69 suggested, you can write each vector in terms of its x and y (or "i" and "j") components. Add like components together.

7. Jun 23, 2011

### devvaibhav

@RTW69 tnx....it was hell simple..i was confused..tnx for it...
@Redbelly98 its ok.....

thanks everyone...........