Finding X and Y components of a vector of magnitude

  • Thread starter Sonny18n
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  • #1
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1. A- What are the x and y components of a vector of magnitude 25m/s and direction of 45 degrees?

B- What are the x and y components of a vector of magnitude 75N and a direction of 60 degrees.


2. Are these the formulas you use?

Vx=(R)Cos0
Vy=(R)Sin0



3. help plz
 

Answers and Replies

  • #2
Simon Bridge
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Welcome to PF;
Never mind trying to figure out which formula is for which - instead, use your knowledge of geometry.
Start by drawing out a pair of x and y axes, then sketch the vector on those axes.
If you draw a dotted line at 90deg from the x axis to the tip of the vector arrow, you will have a triangle where the vector is the hypotenuse.
The components are the other two sides.
 
  • #3
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90 degrees? As in a right angle? Can you clarify that
 
  • #5
Simon Bridge
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90 degrees? As in a right angle? Can you clarify that
That's right - "deg" = "degrees" (it's easier to type than those little circles).
90deg = (pi/2)rad = "perpendicular to" = (yes) the right angle.
It's how you normally read off a coordinate from an axis.

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