(c) What is the purpose of the pulley B?
(d) If the tension is T, deduce the relation between (i) T and E, and (ii) E and L.
(e) What is the velocity ratio of the arrangement?
(f) Assuming that the efficiency of the system is 100%, what is the mechanical advantage?

Solutions :

(c) The fixed pulley B’s purpose is to change the direction of effort from upward to downward

(d) The fixed pulley B’s purpose is to change the direction of effort from upward to downward  The effort E balances the tension T at the free end. E = T is the result

(e) This configuration has a velocity ratio of two

(f) The mechanical advantage is 2 if the system efficiency is 100 percent.