What is the efficiency of a pulley and how do we calculate it?

[Stano123]

Homework Statement

I'm on my last question for my coursework and this is it.

I have managed to find out how to calculate the efficiency of a pulley but not "what is the efficiency of a pulley"

Could someone please help me.

Homework Equations

Efficiency = (Mechanical Advantage / Velocity Ratio) X100%

The Attempt at a Solution

 

[Spinnor]

The following explains what you need in the first page or so,

http://www.batesville.k12.in.us/physics/phynet/mechanics/energy/labs/pulley_lab_1.htm