Asked in Premeth — Coordination and Control, Vectors and EquilibriumModerate

Resultant of two forces 30N and 40N acting perpendicular to each other is

Correct answer: C. 50N

  • A. 70N
  • B. 10N
  • C. 50N
  • D. 40N

Explanation

Of course, with a triangle with a 90° angle, a right triangle, you can simply use.Pythagoras theorem (a2+b2=c2) then SOH-CAH-TOA to solve for the angle (\theta=Cos-1(\frac{adjacent}{hypotenuse} )) .(θ=Cos−1(adjacent/hypotenuse)).But what if it isn't a right triangle? The cosine rule works for all triangles, even if they don't have a 90° angle.a2=b2+c2−2(b)(c)Cos(A)aWhere a is the missing side, and A is the angle opposite to side a.With this rule, we can find a missing angle or a missing side to any type of triangle, assuming you have the needed variables.Let's plug your example in:Let b=40 c=30 and A=90°a2=402+302-2(40)(30)Cos(90)a Cos(90)=0 which is why Pythagoras theorem works at 90°, but I'll continue as if it did matter.a2=2500-2(40)(30)Cos(90)a 2 =2500−2(40)(30)Cos(90)a2=2500-2400*0a2 =2500−2400∗0a=√{2500}a= 2500a=50Na=50N

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Vector addition combines directed quantities using the head-to-tail, parallelogram and component methods. Work includes finding the resultant magnitude and direction for two or more vectors, resolving vectors into perpendicular components, and distinguishing vector addition from scalar addition, where direction has no role.

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