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Two boys raising a bucket pull it at an angle \theta¸ to each other. If each exerts a force of 20N.and their effective pull is 30N, what is the angle between their arms? |
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Answer» let the angle between the lines of action of their equal forces F be 2θ F = 20 N resultant force in the vertical direction upwards = 2F cosθ => 30 = 2(20) cos θ => cosθ = 3/4 or θ = 41.410° => 2θ = 41.410° x 2 = 82.819° Ans: angle b/w their arms = 82.819° |
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