A crane's safe working load is 9kn at 20degrees above horizontal, this limit is determined by the torque
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A crane's safe working load is 9kn at 20degrees above horizontal, this limit is determined by the torque

[From: ] [author: ] [Date: 11-05-07] [Hit: ]
......
Can withstand
What is the angle of elevation that can safely lift 12kn?

I've tried the law of levers etc but can't work it out any help?

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9 kN * L * Cos(20) = 12 kN * L * CosΘ
CosΘ = 9/12 * Cos(20) = 0.70477
Θ = 45.2º
1
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