- #1
sAXIn
- 12
- 0
The problem is:
we have a rope of total mass M and length L the rope starts from rest on surface and being pulled up by a force F , it's pulled up with constant speed V until the upper end reaches height x .
Find the power (P) needed the pull the rope up as a function of X .
What I did was :
P=dw/dt so if w = Fdx we have P=FV so F is M/L*xg .
so P=MgxV/L [j/s]
But I feel I need integration somewhere it a variable mass problem I think but where ?
thank you in advance
we have a rope of total mass M and length L the rope starts from rest on surface and being pulled up by a force F , it's pulled up with constant speed V until the upper end reaches height x .
Find the power (P) needed the pull the rope up as a function of X .
What I did was :
P=dw/dt so if w = Fdx we have P=FV so F is M/L*xg .
so P=MgxV/L [j/s]
But I feel I need integration somewhere it a variable mass problem I think but where ?
thank you in advance