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# Q6 A crane is hoisting a 500 kg crate. The boom OA is 12 m long with a mass of 150 kg which acts at the mid-point. The hinge at O is a smooth...

it is the same question number 6

Q6 A crane is hoisting a 500 kg crate. The boom OA is 12 m long with a mass of 150 kg which acts at the mid-point. A cable CB of circular cross section is attached to the boom at B where the length OB is 9 m. The hinge at O is a smooth pin-joint which is free to turn (g=9.81ms -2 .( Calculate the minimum diameter required for the cable CB if the maximum allowable tensile stress in the cable is σ allow = 150 MPa . The pin at O is in Double Shear calculate the minimum diameter of this pin if the maximum allowable shear stress in the pin is τ allow = 60 MPa . AOx =55 o BCX =15 o 15

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