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Finding angle for this resultant vector

  • Thread starter RandellK02
  • Start date
  • #1
Hello I am working on this problem and just cant figure it out...


Consider two displacements, one of magnitude 3.0 m and another of magnitude 3.8 m. What angle between the directions of this two displacements give a resultant displacement of magnitude (a) 5.7 m, (b) 2.5 m, and (c) 3.6 m.



I have tried to draw the triangle and then use law of cosines and sines to find the appropriate angle but it seems to not be going the way I want it. Is this the correct solution or is there another way to go?

Any help is greatly appreciated.
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
25,832
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Welcome to PF!

Hello RandellK02! Welcome to PF! :wink:
I have tried to draw the triangle and then use law of cosines and sines to find the appropriate angle but it seems to not be going the way I want it. Is this the correct solution or is there another way to go?
It should work.

(You are drawing the two given sides head-to-tail, aren't you?)

Show us one of your attempts. :smile:
 
  • #3


Okay I will retry my math.
Thanks
 
  • #4
6
0
Website states this is Incorrect.

Consider two displacements, one of magnitude 2.9 m and another of magnitude 4.4 m. What angle between the directions of this two displacements give a resultant displacement of magnitude (a) 5.6 m, (b) 2.9 m, and (c) 4.6 m.

98.1
40.7
75.0
 

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