Question 4 (5) Bituminous coals lumps are needed for boiler feed, CORE Crush labs uses a conventional Ball Mill crusher, such that the average size of coal lumps are reduced from 50mm to 5mm with a determined total energy consumption of 23kW/(kg/s). You need to compute what would be the consumption of energy (in kJ/kg ) needed to crush the same material of average size (5) 95mm to an average size of 5mm, use Rittinger's Law