You are using a single$-$engine scraper rated at $21$ cy heaped that is used to haul material from a pit to

a fill $900$ ft away under severe conditions. The average haul speed will be $14$ mph and the average

return speed will be $20$ mph$.$ Assume, at an average speed of $5$ mph$,$ that $200$ ft is required both to

accelerate and decelerate. The operating efficiency will be equal to a $50-$min hour. You will spend $\mathrm{.}6$

minutes loading this scraper.

A$.$ How much material will be carried in each load? $(10$ Points$)$

B$.$ What is the cycle time? $(10$ Points$)$

C$.$ What is the production per scraper per haul $($ie material moved per hour$)?(10$ Points$)$

D$.[$Bonus$]$ Assume the haul and return times are not given. The rolling resistance of the road is $140$

lb$/$ton$.$ You will be hauling the material down slope at a $6\%$ grade. What is the Total Resistance

of the Haul and the Total Resistance of the Return? $(10$ Points$)$

E$.[$Bonus$]$ Assume the Rimpull chart provided below is the correct one for this equipment. What

will be the haul and return speeds be$?$ What will the revised cycle time be$?(10$ Points$)$