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

Question

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

Answer 1

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

Answer 2

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

Answer 3

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.