A block and tackle system of pulleys consisting of 7 pulleys is used to raise a load of 1000N through a height of 10m. If the total work done against friction in the pulley is 500j. Calculate : (i) the work done by the effort , (ii) the efficiency of the system, (iii) the effort applied
(i) (1000N * 10m) + 500J = ? J
(ii) (1000N * 10m) / [(1000N * 10m) + 500J]
(iii) [(1000N * 10m) + 500J] / (10m * 7) = ? N