Question

The boy raising a bucket pull it an angle to each other if each extract a force of 20N and their effective pulls is 30N what is the angle thita between their arms

Answer 1

Explanation:

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°