A. A four-wheel tractor whose operating weight is 47877 Ib has pulled up a road whose slope is +3.5% and uniform speed. If the average tension in the cable is 4800 Ib, what is the rolling resistance of the road? B. A pneumatic-tired tractor with a 354-hp engine has a maximum of 6.5 mph in second gear. Determine the maximum rimpull of the tractor in current gear if the engine efficiency is 91%. C. An embankment is to be constructed at 10% moisture content. The material will be placed at the rate of 250 c-cy/hr. The specified dry weight of the compacted fill is 2850 Ib/cy. How many gallons of

A. A four-wheel tractor whose operating weight is 47877 Ib has pulled up a road whose slope is +3.5% and uniform speed. If the average tension in the cable is 4800 Ib, what is the rolling resistance of the road? B. A pneumatic-tired tractor with a 354-hp engine has a maximum of 6.5 mph in second gear. Determine the maximum rimpull of the tractor in current gear if the engine efficiency is 91%. C. An embankment is to be constructed at 10% moisture content. The material will be placed at the rate of 250 c-cy/hr. The specified dry weight of the compacted fill is 2850 Ib/cy. How many gallons of

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

A. A four-wheel tractor whose operating weight is 47877 Ib has
pulled up a road whose slope is +3.5% and uniform speed. If the
average tension in the cable is 4800 Ib, what is the rolling
resistance of the road?
B. A pneumatic-tired tractor with a 354-hp engine has a maximum of
6.5 mph in second gear. Determine the maximum rimpull of the
tractor in current gear if the engine efficiency is 91%.
C. An embankment is to be constructed at 10% moisture content. The
material will be placed at the rate of 250 c-cy/hr. The specified dry
weight of the compacted fill is 2850 Ib/cy. How many gallons of
water must be supplied each hour to increase the moisture content
of material from 5 to 10 by weight?
D. How many days required to excavate 456480 Bc-yd by utilizing
three shovels (size 5 c-yd – output 317 c-yd/hr) for 10 hours each
day.
E. Determine the productivity of (3 c-yd) shovel when the height
swing factor (0.97), fill factor 95%, and efficiency 50 min-hr. (cycle
time 23 second)

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A truck tractor unit, operating in its fourth gear range and at its full-rated rpm., is observed to maintain a steady speed of 7.5 mph, when operating under the conditions described herein. Ambient air temperature is 60°F. Altitude is sea level. The tractor is climbing a uniform 5.5% slope with a rolling resistance of 55 lb per ton, and it is towing a pneumatic-tired trailer loaded with fill material. The single-axle tractor has an operating weight of 66,000 lb. The loaded trailer has a weight of 48,000 lb. The weight distribution for the combined tractor trailer unit is 55% to the truck drive axle and 45% to the trailer rear axle. a. The manufacturer, for the environmental conditions just described rates the tractive effort of the new tractor at 330 rimpull horsepower. What percentage of this rated rimpull hp does the tractor develop? i. In performing your calculations, it will be acceptable to assume that the component of weight normal to the traveling surface is equal to the…
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