Civil and Environmental Engineering Answers

A construction company has an opportunity to submit a bid for the construction of a new apartment building. From the specification provided by the developer, the PERT network along with the three time estimate (in week) for each activity as shown in figure-1.

For the water shooting out of the pipe and nozzle under the conditions shown

in figure below, find the height, h about the nozzle to which the water jet will

shoot. Assume negligible head loss.

nozzle

diameter=0.1m

point A

dia=0.2m

PA=55kPa

Find the centroid of the solid generated if the region bounded by y = 2- x^2, x=0, and y=0 is revolved about the y-axis.

Find the area between the curves y^2 - y + x = 0 and y^2 = x + 3.

The city of a population of 161,565 has requested to evaluate its solids waste collection system.

Determine:

i) mean time per collection stop plus the mean time to reach the next stop,

ii) number of pickup locations per load

iii) minimum number of trucks the city must own.

Consider the following data:

a) Average truck capacity =18 m3

b) Average observed compaction ratio =3.28

c) Crew size = 2 persons

d) Number of pickups = 1/week (no rear-of-house service)

e) Average number of residence per stop= 2.5

f) Average uncompact density = 122 kg/m3

g) Average transport time to disposal site including delay and dumping = 1.5 h/trip

h) Average number of trips to disposal site =2/day

i) Rest breaks = 2 at 15 min

j) Average maintenance downtime = 36 min/day

k) Average work day = 8 hours

l) Average percentage of truck out of service for majority repairs = 15%

m) Average number of cans per stop = 2.5/wk at 0.0911 m3/can

A contractor is trying to estimate the distance to be expected of drawdown of 4.81 m from pumping well under the following conditions:

a) Pumping rate 0.028 m3/s

b) Pumping time = 1066 days

c) Drawdown in observation well = 9.52 m

d) Observation well is located 10.0 m from the pumping well

e) Aquifer material = medium sand

f) Aquifer thickness = 14.05 m

Assume that the well is fully penetrating in an unconfined aquifer.

AGGREGATE MOISTURE (ASTM C566)

MOISTURE CONTENT

DATA AND TABULATION

Mass of Container, Mc = _______35____g.

Mass of Container + original sample, Mc+w = ______520___g.

Mass of container + dried sample, Mc+D = ____472______g.

Mass of original sample, W = _______g.

Mass of Dried sample, D = ________g.

MOISTURE CONTENT

DATA AND TABULATION

Mass of Container, Mc = _______35____g.

Mass of Container + original sample, Mc+w = ______520___g.

Mass of container + dried sample, Mc+D = ____472______g.

Mass of original sample, W = _______g.

Mass of Dried sample, D = ________g.

An open cylindrical tank 4 ft in diameter and 6 ft deep is filled with water and rotated about it's axis at 60 rpm. How much liquid is spilled, and how deep is the water at the axis?

1.Aside from area by triangles, what are other common methods used in determining/ measuring the required area?

2. What are the similarities and/or differences of each method?