What caused the cable to break during the lifting of a 4500kg container?

AI Thread Summary
The investigation into the cable break during the lifting of a 4500kg container indicates that the cable's maximum tension capacity is 50,000N. Calculations show that the tension experienced during the lift was 48,645N, which is below the cable's safety rating, suggesting the load was not too heavy. The crane's specifications for speed and acceleration were adhered to, confirming it was not defective. Further analysis indicates that the cable must have been defective, as it failed under conditions that should have been safe. The conclusion is that the cable's integrity was compromised, leading to the accident.
ixbethxi
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You've been called to investigate an accident in which a cable broke while lifting a 4500kg container. The steel cable is 2.0cm in diameter and has a safety rating of 50,000N. The crane is designed not to exceed speeds of 3.0m/s or accelerations of 1.0m/s^2, and your tests find the crane is NOT defective. what is your conclusion? did the crane operator life too heavy a load or was the cable defective.

can someone check my solution? i don't know if its right

the max tension the cable can hold is 50,000N

T-((4500kg)*(9.81m/s/s))=4500(1.0m/s/s)

T= 48,645<50,000 which means the cable must of been broken because it could possibly hold more.
 
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What about speed, vertical or horizontal?
 
ixbethxi said:
You've been called to investigate an accident in which a cable broke while lifting a 4500kg container. The steel cable is 2.0cm in diameter and has a safety rating of 50,000N. The crane is designed not to exceed speeds of 3.0m/s or accelerations of 1.0m/s^2, and your tests find the crane is NOT defective. what is your conclusion? did the crane operator life too heavy a load or was the cable defective.

can someone check my solution? i don't know if its right

the max tension the cable can hold is 50,000N

T-((4500kg)*(9.81m/s/s))=4500(1.0m/s/s)

T= 48,645<50,000 which means the cable must of been broken because it could possibly hold more.

Yes. You are somehow right.

If u were to work out the acceleration allowed to lift the weight. 50000-(4500*9.81)= 4500a By working out a, u will get the max acceleration allowed for the lifting of the mass. From there, you can see that the acceleration is more than that of those specified in the qn. Thus, its not that the mass is too heavy but its due to the defective cable.
 
ixbethxi said:
... and your tests find the crane is NOT defective. what is your conclusion?...
 
i concluded that it waas the cable that was defective
 

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