you set up a pulley to help you left something. You anchor the rope at one end and arrange a moveable pulley?

7 Answers

• Assuming only one pulley, on the object being lifted, then you will have pulled 5 m of rope through that one pulley.

  It is interesting that you posted your question in boating. Did you do this to get a sailor’s opinion? We use pulleys all the time for rigging sails, etc…, sometimes with multi part pulleys with 6 or even 8 to one ratios.

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  RE:

  you set up a pulley to help you left something. You anchor the rope at one end and arrange a moveable pulley?

  to achieve a mechanical advantage of 2. By the time you have lifted the object 5m off the ground, how much rope have you pulled through the pulley?

  A. 2m

  B.5m

  C.7m

  D.10m

• I’m not sure which pulley you are referring to. If its the lower pulley the rope has travelled through it 5cm and if its the upper pulley 10cm. That’s because the lower pulley is supported by rope on both sides so the rope has to travel 10cm through the upper pulley to lift the lower pulley 5cm.

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  Mechanical advantage, distance moved and length of line required with pulleys is a simple mathematical equation. Simply multiply the distance you need to cover with the mechanical advantage factor and you will get the length of line required. In this case, 5m x 2=10m of line required (not including enough to go around the pulleys and to hang on to).

• To achieve a mechanical advantage of 2, you need to pull twice as much rope through the pulley as you have lifted the object.

  So the correct answer is “D”, 10m.

  Just remember, you don’t get something for nothing. To lift twice as much, you have to lift the same twice as far.

  Regards,

  Dan

• Don’t know but it’s called a anchor (rode) not a rope when it’s on a boat>

• try wikipidia/block and tackle. all youll ever need to know. simple math!! not trying to be mean, I do the same thing to my kid!