Question

The resultant of two forces p and q is at right angle to p . Show that the angle between the two forces is cos-1(-p/q)

Answer 1

Step-by-step explanation:

tan90 = q sinx / ( p + q cosx) = 1/0

x = angle between vectors

Learn the formula

p + q cosx = 0

q cosx = -p

cosx = (-p/q)

x = cos-1(-p/q)

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