How Strong Does the Cable Need to Be?

[Ingar]

I'm trying to figure out how strong the cable would need to be if that washer the hand is holding was 175 pounds and the string was 20 feet long and weighed 9 onuses and the weight was dropped from that angel.
I know there will be extra "weight", "tension" on the cable because of the momentum and weight, I just don't know how to calculate how much that is. This is a silly question, I really should know the answer, but it would be awesome if you could help me. Thank you so much. xD

 

[Deleted member 4993]

I'm trying to figure out how strong the cable would need to be if that washer the hand is holding was 175 pounds and the string was 20 feet long and weighed 9 onuses and the weight was dropped from that angel.
I know there will be extra "weight", "tension" on the cable because of the momentum and weight, I just don't know how to calculate how much that is. This is a silly question, I really should know the answer, but it would be awesome if you could help me. Thank you so much. xD

Draw the free body diagram of the particle at the lowest point. Neglect the mass of the string (mass of washer is >> mass of string)

velocity of the washer at the lowest point (assuming point mass and no-loss) = √(2gh)

Now equate the vertical forces (T - W) to centripetal acceleration - and solve for T.