A block and tackle consisting of 5 pulleys is used to raise a load of 400N through a height of 10m. If the work done against friction is 1000joules. Calculate

Question

A. The work done by the effort
B. The efficiency of the system
C. The effort applied

Answer 1

A. The work done by the effort can be calculated using the work formula:

Work = Force * Distance

Given:
Force (effort) = ?
Distance = 10m
Work = ?

Since no information is given about the force applied, we cannot directly calculate the work done by the effort. We need additional information in order to solve this part of the question.

B. The efficiency of the system can be calculated using the formula:

Efficiency (%) = (Useful Work Output / Total Work Input) * 100

Given:
Total Work Input = 1000 joules (work done against friction)
Useful Work Output = 400N * 10m (work done to raise the load)

Efficiency (%) = (400N * 10m / 1000 joules) * 100
Efficiency (%) = 40%

C. The effort applied cannot be calculated without additional information about the force applied.