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4.A push of 180 N and pull of 350 N act simultaneously at a point. Find the resultant of theforces, if the angle between them be 135°.Ans. 494 N , 3091 |
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Answer» Let the resultant be R. R^2 = P^2 + Q^2 + 2PQ cos (theta)= (350)^2 + (180)^2 + 2 (350) (180) cos (135°)= 65804.55 R = 256.52 newton Let R make an angle x with P. tan (x) = Q sin (theta) / (P + Q cos (theta))= 180 sin (135°) / (350 + 180 cos (135°))= 0.57 x = arctan (0.57) = 29.68° |
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