Question

if the resultant of two equal force is times a single force . find the angle between the force

Answer 1

angle theta occurs hope you got the answer

Answer 2

LET THE FORCES ARE 'F' AND 'F' . THE RESULTANT IS ALSO 'F'. LET IN BETWEEN ANGLE IS 'A'.  WE KNOW THAT,------

  F = (F^2 +F^2 + 2*F*F*cosA)^0.5

or, F^2 =2*F^2 +2*F^2cosA

or, -F^2 = 2*F^2cosA

or, -1 =2cosA

or, cosA = -0.5

or, A = 120 degree

SO THE ANSWER IS 120 DEGREE