Civil and Environmental Engineering Answers

Consider the following nuclear transmutation:²³⁸₉₂U(n,β^-)X. What is the identity of nucleus X?

perform the forward pass and backward pass calculation for the following network and determine the following information

perform the forward pass and backward pass calculation for the following network and determine the following information

Two instructors announced that they “grade on the curve,” that is, give a fixed percentage of each of

the various letter grades to each of their classes. Their curves are as follows:

If a random student came to you and said that his object was to enroll in the class in which he could

expect the higher grade point average, which instructor would you recommend?

Annual savings due to an energy efficiency project have a most likely value of $30,000. The high

estimate of $40,000 has a probability of 0.2, and the low estimate of $20,000 has a probability of 0.30.

What is the expected value for the annual savings?

A project has a life of 10 years, and no salvage value. The firm uses an interest rate of 12% to evaluate

engineering projects. The project has an uncertain first cost and net revenue.

What is the joint probability distribution for first cost and net revenue?

A road between Fairbanks and Nome, Alaska, will have a most likely construction cost of $4 million per

mile. Doubling this cost is considered to have a probability of 30%, and cutting it by 25% is considered

to have a probability of 10%. The state’s interest rate is 8%, and the road should last 40 years. What is

the probability distribution of the equivalent annual construction cost per mile?

A company just purchased an intelligent robot, which has a first cost of $80,000. Since the robot is

unique in its capabilities, the company expects to be able to sell it in 4 years for $95,000. (a) If the

company spends $10,000 per year in maintenance and operation of the robot, what will the company’s

MACRS depreciation charge be in year 2? Assume the recovery period for robots is 5 years and the

company’s MARR is 16% per year when the inflation rate is 9% per year. (b) Determine the book value

of the robot at the end of year 2.

A video recording system was purchased 3 years ago at a cost of $30,000. A 5-year recovery period

and DDB depreciation have been used to write off the basis. The system is to be replaced this year with

a trade-in value of $5000. What is the difference between the book value and the trade-in value?

Equipment for immersion cooling of electronic components has an installed value of $182,000 with an

estimated trade-in value of $40,000 after 15 years. For years 2 and 10, use DDB book depreciation to

determine (a) the depreciation charge and (b) the book value.