Thank you very much Tech99 and Sophiecentaur, substituting the weight to be 40 kg, I did the calculation on the worse case if one line is straight, and found that the tension is as huge as 8 kN, and needed to use some support for sure. The support is also drawn in the diagram.
Here is the free...
Hello,
My friend needs to transfer construction objects across a pond, came up with this idea of tying a rope between the pond and a big tree then transfer objects through a pulley, I'd like to know how to calculate the tension and will the thin concrete wall withstand the load? Here a diagram...