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Find the resultant force in each case: a) Forces 33N and 47 N acting at a point at an angle of 40 degree to each other. b)A third force is acting on the point at an angle of 140 degree to the resultant force in part a.

Find the resultant force in each case:


a) Forces 33N and 47 N acting at a point at an angle of 40 degree to each other.


b)A third force is acting on the point at an angle of 140 degree to the resultant force in part a.

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1 Answers

vikas askiitian expert
509 Points
11 years ago

a) F1 = 33 , F2 = 47

resultant = R = [F12+F22 +2F1F2COS@]1/2

@ is the angle bw F1 & F2

@ is 40 , so cos@ = 0.72 approx

plugging all these values we get

R = 73N approx

 

b) here @ is 140 so cos140 = cos(180-40)

                                        =-cos40 = -0.72

resultant = R = [332 +472-2x0.72x33x47]1/2

                   = 34N approx

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