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

[ixbethxi]

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.

 

[mukundpa]

What about speed, vertical or horizontal?

 

[gunblaze]

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.

 

[mukundpa]

... and your tests find the crane is NOT defective. what is your conclusion?...

 

[ixbethxi]

i concluded that it waas the cable that was defective