ESSENTIAL ENVIRONMENT
6th Edition
ISBN: 9780134838885
Author: WITHGOTT
Publisher: PEARSON
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Chapter 1, Problem 3SS
To determine
To describe: Ethical perspective or worldview as it pertains to individual relationship with its environment and do individual fit into any particular category. How an individual think his culture has influenced his worldview. How his personal experience shaped it and the environmental problems individual feel most acutely to himself.
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Homework 8
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Question 3 of 5
Entering Steam
>
>
Check table lookups for correct values.
Check significant figures.
Check unit conversions.
Calculate the required flow rate of the entering steam in m³/min.
0.00132
m³/min
eTextbook and Media
Hint
0/1
Assistance Used
Determine the specific enthalpy change of each stream first. Then use the known flow rate of the methanol to calculate the
steam flow rate.
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Heat Transferred
× Check units and significant figures.
Calculate the rate of heat transfer from the water to the methanol (kW).
i 44.5
kW
Hint
Don't forget to convert minutes to seconds.
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Attempts: 3 of 5 used
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Assistance Used
Attempts: 2 of 5 used
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Consider, M people (aka pax) who want to travel by car from O to D. They all start working at
D at Q (e.g., Q-8am). If a person departs at time t, assume the time needed to go from O to D
is given by c(t)=A+Bx(t), where x(t) is the flow of people departing at time t [car/unit of time].
In addition, a is the penalty for being early at work (E(t) is how early the person arrived when
departing at time t), and ẞ is the penalty for being late at work (L(t) is how late the person
arrived when departing at time t). Assume 0 < a < 1 < ß. Further assume the departure time
choice problem under the equilibrium conditions. Prove that the arrival time of people who
depart when most of the M people start their trips is equal to Q.
Create the PLC ladder logic diagram
for the logic gate circuit displayed in
Figure 7-35. The pilot light red (PLTR)
output section has three inputs: PBR,
PBG, and SW. Pushbutton red (PBR)
and pushbutton green (PBG) are inputs
to an XOR logic gate. The output of the
XOR logic gate and the inverted switch
SW) are inputs to a two-input AND
logic gate. These inputs generate the
pilot light red (PLTR) output.
The two-input AND logic gate output
is also fed into a two-input NAND logic
PBR
PBG
SW
TSW
PLTR
Figure 7-35. Logic gate circuit for Example 7-3.
PLTW
Goodheart-Willcox Publisher
gate. The temperature switch (TSW) is the other input to the NAND logic gate. The output generated from
the NAND logic gate is labeled pilot light white (PLTW).
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