1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
tensa zangetsu [6.8K]
3 years ago
15

As a project manager of Very Good Construction you want to plan renting a fleet of 25 cu yd tractor-scrapers and have them hauli

ng between the pit and a road construction job. The haul road is a rutted dirt road that deflects slightly under the load of the scraper. There is a slight grade of 2.5% from the pit to the fill location. Rolling resistance factor is assumed as 100 lbs/ton. The return road is effectively level. The haul distance to the dump location is 0.50 miles and the return distance is 1.50 miles. The scrapers are push loaded in the pit. The cycle time for the pusher is 1.50 minutes and the cycle time for the scrapers is 8 minutes. Assume that the weight on the wheels is 75 tons (full) and 50 tons (empty).
a. What are the rolling resistances and grade resistance?
b. What are the effective grades?
c. How many scrapers you recommend to be rented? Explain.
d. What is the production of the system in case 4 scrapers would be rented?
Business
1 answer:
zzz [600]3 years ago
7 0

Answer:

Explanation:

a. Rolling resistance factor = 100 lb/ton for hauling as well return path Grade for haul route = 5%. Grade for return route = 0 From Table 14.2 – rutted dirt road – rolling resistance factor = 100 lb/ton, Rolling resistance on haul route = 100(75) = 7,500 lbs Rolling resistance on return route = 100(50) = 5,000 lbs Grade resistance, GR = % grade 20lb/ton/%grade weight on wheels (tons) Grade resistance on haul route = 5 × 20 × 75= 7,500 lbs

b. Effective (Equivalent) Grade = RR% + GR% To convert rolling resistance, RR into rolling resistance factor, RR%, divide rolling resistance by 20 (see section 14.5 in the text book) and therefore; Effective grade = + grade Effective grade while hauling = + 5 = 10% Effective Grade while returning = + 0 = 5%.

c) Considering the cycle time of the pusher and the scrapers, Scrapers to be used = = 6.4 The motivation is to keep the pusher busy all the time instead of waiting for the scraper to return If 6 scrapers are used, the pusher will be idle and the cost will be lower (since we will have 6 scrapers and 1 pusher). So is the productivity. If 7 scrapers are used, the scrapers will be idle and the productivity will be higher. So is the cost.

d)The productivity will depend on the scrapers (the pusher with idle time) which will be:

You might be interested in
What are the business reasons behind john deere's offshoring of tractor production from the u. S. To other countries?
Yuri [45]

Reasons for shifting production to other countries John Deere is a global leader in the tractor market and its strategic objective is to expand rapidly outside of North America. One of the ways to expand globally is to make the product closer to the target market

Offshoring is the practice of a firm moving its service and production operations to a different nation. A corporation with American roots, John Deere is well recognised for assembling and producing agricultural tractors.

Samuel Allen, the company's CEO, predicts that Offshoring the company's tractor manufacture overseas will boost overall sales to $50 billion by 2018, with half of that amount coming from nations other than the US and Canada. Offshoring production would aid in growing the business to a worldwide scale in addition to boosting revenue.

Due to differences in time zones, the company's production processes and services would be available around the clock. The cost of manufacture would also be reduced by offshore tractor production.

The business would stop paying the costs of transporting tractors from the base production site to foreign nations. The need to exert more control, an effort to reduce risks, and a desire to concentrate on business development are some further justifications for outsourcing.

To learn more about offshoring here,

brainly.com/question/22541228

#SPJ4

8 0
2 years ago
1.The percentage of the labor force that belongs to a union is known as the
Helen [10]
1) The percentage of the labor force that belongs to a union is known as the UNIONIZED PERCENTAGE RATIO.

2) The equilibrium wage rate is determined by the point of intersection of labor market supply and labor market demand. Equilibrium wage is the wage where the company agrees to pay and the worker agrees as the value of his work.

3) The effect of union exclusion of nonunion workers is to lower the wages of nonunion workers.

4) A market with one buyer and one seller is a bilateral monopoly. Monopoly is a market with only one seller. Monopsony is a market with only one buyer.
4 0
3 years ago
You have saved​ $120,000 for your child to attend college. If it is in an account earning an annual rate of​ 8%, how much can yo
harkovskaia [24]

Answer:

I will take $36,230.5 to pay for the education of child.

Explanation:

Cash Invested in the saving account will earn a return of 8% each year and this amount could be withdrawn by the me to pay for the education of child.

We will use following formula to calculate the annual payments

P = r ( PV ) /  [ 1 - ( 1+ r )^-n ]

where

PV = amount of investment = $120,000

r = rate of return = 8%

n = number of period = 4 years

P = 8% ( 120,000 ) / [ 1 - ( 1 + 0.08 )^-4 ]

P = 36,230.5

3 0
3 years ago
The federal funds rate is the interest rate that banks charge one another for short-term (typically overnight) loans. When the F
WARRIOR [948]

Answer: decreases

                                                                         

Explanation: The following practice is done by the central bank in the situation of inflation when there is an excess supply of money in the economy.

The central bank tries to decrease the funds by selling the govt bonds to the banks. This results in decrease in funds from banks as they have to buy such bonds from their respective funds.

6 0
2 years ago
According to current law, for works created after 1976, what are the copyright durations for a creator and for a corporation?
Elenna [48]
Answer:
For the creator, the copyright duration is the lifetime of the author plus 50 years.
For a corporation, the copyright duration is 75 years.

Details:
The copyright Act of 1976 was a revision of the previous copyright Act of 1988.
Another revision enacted by the 1976 copyright law was to increase the extension of copyrighted material before 1978 that was not in the public domain. The increase was from 28 to 47 years or a total duration of 75 years.
5 0
3 years ago
Other questions:
  • Which of the following is true about planned economies?
    8·1 answer
  • Adam smith called the force that guided the competition from scarce resources in a free market the _____ a0 hand
    10·1 answer
  • Present and future value tables of $1 at 3% are presented below:
    14·1 answer
  • Kevin is the human resource manager for a large company. he actually has a favorable attitude toward the handicapped in general.
    5·1 answer
  • BBQ Corporation has a target capital structure that is 70 percent equity, 30 percent debt. The flotation costs for equity issues
    6·1 answer
  • Determine the profit-maximizingLOADING... prices when a firm faces two markets where the inverse demand curves are Market​ A: p
    9·1 answer
  • In a particular setting where the newsvendor model applies, demand is Normally distributed and the critical ratio is 0.4. Then,
    12·1 answer
  • Given the equity portion of a firm's balance sheets below, determine the average price per share at which new shares were sold b
    10·1 answer
  • Perpetual Life Corp. has issued consol bonds with coupon payments of $50. (Consols pay interest forever and never mature. They a
    5·1 answer
  • An indication of one’s lifestyle is __________________.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!