$1-$How long will it take a crawler dozer with straight blade to move $6,700m^3$ for $150$ meters?

The ideal production for $150m$ distance is $320$LCM. Ideal production values are based on a

soil density of $2,300k\frac{g}{L}CM.$

Grade $-2\%($down grade correction $1\mathrm{.}07).$

Dry clay, $1,950k\frac{g}{L}CM.$

Operator of average skill $($operator skill $0\mathrm{.}75).$

The operating time is $50-mi\frac{n}{?}$ hour.

$2-$A track$-$type tractor whose weight is $15$ tons has a drawbar pull of $5,685kg$ when operated on

a level road with a rolling resistance of $110k\frac{g}{t}on.$ If the tractor is operated on a level road

with $180k\frac{g}{?}$ ton rolling resistance, what will be the effective drawbar pull?

$3-$A wheel tractor scraper is used on a road project. When the project begins, the scraper will

experience high rolling and grade resistance at one work area. The rimpull required to

maneuver in this work area is $42,000kg.$ In fully loaded condition, $52\%$ of the total vehicle

weight is on the drive wheels. The fully loaded vehicle weight is $230,880kg.$ What minimum

value of coefficient of traction between the scraper wheels and the traveling surface is needed

to maintain maximum possible travel speed?

$4-$A contractor proposes to use scrapers on an embankment job. The performance characteristics

of the machines are shown in the figures. The scrapers have a rated struck capacity of $14-$cy$.$

Operating weight empty is $69,000lb.$ The weight distribution of the scraper when loaded is

$53\%$ on the drive wheels. The contractor believes that the average scraper load will be $15\mathrm{.}2$

$BCY.$ The haul from the excavation area is a uniform adverse gradient of $5\mathrm{.}0\%$ with a rolling

resistance of $60I\frac{b}{t}on.$ The material to be excavated and transported is common earth with a

bank unit weight of $3,200I\frac{b}{B}CY.$

a$.$ Calculate the maximum travel speeds that can be expected. Equivalent Grade $\%=$

rolling resistance factor $($lb$/$ton$)/20.$

b$.$ If the job is at elevation $12,500ft,$ what will be the operating speeds when consideration

of the nonstandard barometric pressure is included in the analysis? For operating at an

altitude of $12,500$ ft$,$ the manufacturer has reported that these scrapers, which have

turbocharger engines, can deliver $82\%$ of rated horsepower.