Easiest way for two men to lift a pipe

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In summary, the conversation discussed why it is easier to lift a pipe when the rope is loose around it compared to when the rope is tied tightly and shorter. The explanation given was that the tension in the rope is less when it is longer, making it easier for the porters to lift the pipe. However, this explanation was challenged by the fact that a shorter rope with a greater angle (theta) did not result in easier lifting.
  • #1
voyager221
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If rope is wrapped around a pipe and two men are lifting it up why is it easier to lift when the rope is loose around the pipe (A) and harder when the rope is tied tightly to the pipe in a knot at both ends (B) ?

I presumed this was because on A the weight is less concentrated?
 
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  • #2
I'm guessing a bit at the diagram...
Rope attached to one end of pipe, rises at angle theta to horizontal to first porter, proceeds horizontal to second porter, descends at angle theta to attach to other end of pipe. And the question is, why does a longer rope (greater theta) make it easier on the porters?
Pipe weight W, tension in rope T = W cosec(theta)/2.
To balance the tension locally, each porter has to pull at angle theta/2 to vertical with force F = 2T sin(theta/2).
Thus F = W sec(theta/2)/2. This is minimised when theta is 0.
So it doesn't support your observation.
Maybe I have the diagram wrong.
 
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1. What is the easiest way for two men to lift a pipe?

The easiest way for two men to lift a pipe is to use a lifting device such as a crane or forklift. This will allow for the pipe to be lifted safely and with minimal effort from the two men.

2. Can two men lift a pipe without a lifting device?

It is possible for two men to lift a pipe without a lifting device, but it may require a significant amount of strength and may not be safe. It is recommended to use a lifting device for the safest and easiest way to lift a pipe.

3. How should two men position themselves to lift a pipe?

Two men should stand on opposite sides of the pipe, with one man at each end. They should have a firm grip on the pipe and communicate with each other to ensure they are both lifting at the same time.

4. Is there a specific technique for lifting a pipe with two men?

Yes, there are a few techniques that can make lifting a pipe with two men easier. These include using a lifting strap or rope to evenly distribute the weight, and using a leg lift technique where the men use their legs to lift the pipe rather than their backs.

5. What safety precautions should be taken when lifting a pipe with two men?

When lifting a pipe with two men, it is important to wear proper safety gear such as gloves and steel-toed boots. In addition, proper lifting techniques should be used to avoid injury. It is also important to communicate with each other and have a plan in case the pipe becomes too heavy to lift safely.

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