Sorry but I'm having a difficult time figuring these questions out... :*( Gladly they're all related to Elastic Energy! :thumb:
1. A man is on a bridge 22.9m above a lake. He is 1.8m tall and weights 60.0kg and he is tired to a bungie cord that is 12.2m in length. He jumps off the bridge at his head just touches the water. What is the value of k for this to be possible? What acceleration does he have at the bottom of his fall?
Well I already got the correct value of k for the bungie cord which is 405N/m but than fining the velocity is kinda wonky cause I thought was I could find the elastic energy that is contain in the cord and make that to E=fd but the problem is that he's on the cord and so I'm lost and I don't know what to do :*(
2. A 0.5kg mass is connected to a string which is connected to a wall and it is sitting at point A. You pull it and it flies at 3.375m/s as it passes point A. At what distance did you pull the mass at from point A? This was conducted at ground level.
I really have no clue here >.> I tried making it so that the initial elastic energy of the string is equal to the final kinetic energy Ee = Ef ' but apparently I'm getting the wrong answer and I can't think of any other way to get the answer so I'm sad :*(
3. At ground level, a spring with a spring constant of 555N/m is attached to a wall and is being pushed 0.12m by a wooden block weighing 1.50kg, the spring is than released. What is the speed of the block it leaves the string? Ignore friction and the mass of the string is irrelevant.
Again I tried doing something similar where I though the initial elastic energy is equals the final kinetic energy but sadly it's the wrong answer again, so I don't know what I'm missing >.<
Help pl0x :*(