A mobile equipment has the performance chart shown beneath. Knowing that the empty weight is $16800$ kg while the loaded weight is $28500$ kg and assuming the efficiency is $100\%,$ the grade is $4\%,$ and the hauling process is done while downhill, calculate:

a$.$ The maximum value of rolling resistance $($in $l\frac{b}{t}on)$ over which the fully loaded unit can maintain a speed of $35k\frac{m}{h}r.$

b$.$ The minimum value of coefficient of traction between the tractor wheels and the traveling surface that is needed to satisfy the requirements in part $($a$).$ Assume that $50\%$ of the weight is distributed to the drive axle.

GROSS WEIGHT

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$2.$ A track$-$mounted D$375$A $($power$-$shift$)$ dozer is used in a pushing operation. The material is dry & cohesionless and swells by $15\%$ from bank to loose state. The hauling distance is $80$ m downhill at a grade of $4\%$ and the traction is ideal. The job efficiency is $50$ min per hour. The operator's wage is LE $300$ per day and the working day is $8$ hrs $.$ Using the Komatsu charts and factors in pages $1$B$-27$ and $1$B$-28$ of the Komatsu handbook, calculate the cost per banked cubic meter for the following cases:

a$.$ If a semi$-$universal dozer is used with an O&O cost of LE $600/$hr$.$

b$.$ If a universal dozer is used with an O&O cost of LE $800/$hr$.$

$3.$ Redo problem $3$ using AI$.$ Compare the AI answers with your answers in question $2.$