1. The problem statement, all variables and given/known data What's the tension on each cable ? and the power required to overcome tension (?) Here's the diagram: http://en.wikipedia.org/wiki/File:Planincline-schema.JPG 2. Relevant equations F=Vsin(theta) ( constant velocity ) = a= 0 Inclined (24.25 degrees) to the horizontal plane) Weight of block: 25T lighter then the counterweight when pushed upwards. and 25T heavier when pushed downwards the inclined plane. Ascending and descending journey time: 4 min vertical height: 55m Average velocity calculated: Inclined displacement = 55M/ sin(24.25) Average velocity= (55m/sin(24.25))/2(60)s = 1.11 m/s on each journey upwards and downwards. ( is this right ? ) should it be divided by 4(60) instead? 3. The attempt at a solution F(push) = (25 x 10^3)(9.81)sin(24.25) F(counterweight) = (50 x 10^3)(9.81)sin(24.25) Tension on cables: ((50 x 10^3)(9.81)sin(24.25)) - (25 x 10^3)(9.81)sin(24.25) The block is attached to the counterweight by two groups of 14 cables so is the tension on each group of cable = T= Total tension/2 = 50.350KN The power required to lift the block on each group of cable Work done = Tension x displacement Work done= 50.350 KN x 134m Work done= 6747.0 KN.m Work = 6747.0 KN.m/2(60) = 56.2 KW for each group of 14 cables. is this calculations correct ?