
Sustainable Energy, Si Edition
2nd Edition
ISBN: 9781337551670
Author: DUNLAP, Richard A.
Publisher: Cengage Learning
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Chapter 17, Problem 15P
(a)
To determine
Find the payback period for the additional investment in polystyrene.
(b)
To determine
Find the payback period for the additional investment in polystyrene for San Francisco.
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Find forces in all members of the truss shown in Fig.
Also find reactions at supports.
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20 kN
ΙΟΧΟΙΟΙ
2 m
2 m
2 m
3 m
C
G
E
4 m
B
Determine forces in members BC, GF and CG and nature of forces
9 m
D
4 m C
4 m
F
4 kN
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Assignment-2
Part 3: Problem-Solving. Solve the following problems. Show all calculations.
1. A retaining wall 5.80m high supports soil that has the following properties:
Unit weight = 17.3 kN/m³
Angle of internal friction = 26 deg.
Cohesion = 14.5 kPa
a) Calculate the normal pressure acting at the back of the wall assuming no tensile crack
occurs in the soil.
b) Find the location of the tensile crack measured from the surface of horizontal backfill.
c) Determine the active pressure acting on the wall in tensile crack occurs in the soil.
2. The soil material is supported by a retaining wall to a height of 6m. The unit weight of the soil is
16 kN/m³ and the angle of internal friction is 29 deg. Assume the soil is cohesionless.
a) Determine the earth pressure on the wall.
b) Find the total active pressure if surcharge of 14 kPa is applied on the surface of
horizontal backfill.
c) Locate the position of the total pressure from the bottom.
Question 3 (20 points): The traffic volume on a 2-lane highway is 1600 veh/hr in each direction
Page 3 of 6
with a density of 20 veh/mi. A large dump truck enters the traffic stream from an adjacent
construction site at 20 mph and carries on this way for 2 miles before turning off to the dump
site. Because flow is so high in the opposite direction, no one can pass the truck. As a result,
traffic back up behind the truck at four times the density (i.e., 4x20 = 80 veh/mi) at a volume of
1000 veh/hr. How many vehicles get caught in the traffic congestion before the truck exits the
highway?
Chapter 17 Solutions
Sustainable Energy, Si Edition
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- What is the budgeted unit work hours, in work hours per unit for the concrete walls?arrow_forwardWhat are the total earned work hours at completion for the column forms?arrow_forward6000 units have been installed to date with 9,000 units to install. Labor costs are $23,300.00 to date. What is the unit cost for labor to date?arrow_forward
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- Please explain step by step and show formulasarrow_forward5. (20 Points) Consider a channel width change in the same 7-foot wide rectangular in Problem 4. The horizontal channel narrows as depicted below. The flow rate is 90 cfs, and the energy loss (headloss) through the transition is 0.05 feet. The water depth at the entrance to the transition is initially 4'. 1 b₁ TOTAL ENERGY LINE V² 129 У1 I b₂ TOP VIEW 2 PROFILE VIEW h₁ = 0.05 EGL Y₂ = ? a) b) c) 2 Determine the width, b₂ that will cause a choke at location 2. Determine the water depth at the downstream end of the channel transition (y₂) section if b₂ = 5 feet. Calculate the change in water level after the transition. Plot the specific energy diagram showing all key points. Provide printout in homework. d) What will occur if b₂ = = 1.5 ft.?arrow_forward4. (20 Points) A transition section has been proposed to raise the bed level a height Dz in a 7-foot wide rectangular channel. The design flow rate in the channel is 90 cfs, and the energy loss (headloss) through the transition is 0.05 feet. The water depth at the entrance to the transition section is initially 4 feet. b₁ = b = b2 1 TOTAL ENERGY LINE V² 129 Ут TOP VIEW 2 hloss = 0.05 " EGL Y₂ = ? PROFILE VIEW a) Determine the minimum bed level rise, Dz, which will choke the flow. b) If the step height, Dz = 1 ft, determine the water depth (y2) at the downstream end of the channel transition section. Calculate the amount the water level drops or rises over the step. c) Plot the specific energy diagram showing all key points. Provide printout in Bework. d) What will occur if Dz = 3.0 ft.?. Crest Front Viewarrow_forward
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