A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N; calculate the efficiency of the machine.

By: |Published on: Nov 3|Categories: Physics JAMB| 0 comments

A. 80.0%
B. 76.6%
C. 66.7%
D. 60.7%

Correct Answer:

Option C – 66.7%

Explanation

Efficiency = MA/V.R x 100

V.R = number of pulleys = 6

ma = Load/Effort = 200/50 = 4

Effiecieny = 4/6 × 100 = 66.67%

Users Also Read These:

SEE ALSO  A 120V; 60W lamp is to be operated on 220V A.C the supply mains. Calculate the values of non-inductive resistance that would be required to ensure that the lamp is run on current value.

Copyright warnings! Do not copy.