ESC 577 - HOMEWORK 2 – ANSWER SHEET
QUESTION1: (30 points)
1.a. (5 points)
ATMOSPHERIC CO2 CONCENTRATION
CARBON EMISSIONS
CARBON ABSORPTION BY PLANTS
CARBON ABSORPTION BY OCEANS
ATMOSPHERIC CO2 CONCENTRATION
CARBON EMISSIONS
CARBON ABSORPTION BY PLANTS
CARBON ABSORPTION BY OCEANS
(STOCK)
(FLOW)
(FLOW)
(FLOW)
: MtC
: MtC / year
: MtC / year
: MtC / year
1.b. (5 points)
SALINITY
SALTS FLUSHED
SALTS RELEASED
SALINITY
SALTS RELEASED
SALTS FLUSHED
(STOCK)
(FLOW)
(FLOW)
:ppt (parts per thousand)
:ppt/month
:ppt/month
1.c. (5 points)
INFECTED FISH
SUSCEPTIBLE FISH
INFECTION
SUSCEPTIBLE FISH
INFECTD FISH
INFECTION
(STOCK)
(STOCK)
(FLOW)
:# of fish
:# of fish
:# of fish/day
1.d. (5 points)
HOMEWORK ASSIGNED
HOMEWORK COMPLETED
HOMEWORK COMPLETION
HOMEWORK COMPLETION
HOMEWORK ASSIGNED
HOMEWORK COMPLETED
(FLOW)
(STOCK)
(STOCK)
ESC 577 – HOMEWORK #2 – ANSWER SHEET
: questions/week
: questions
: questions
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ESC 577 - HOMEWORK 2 – ANSWER SHEET
1.e. (5 points)
BOOKS CHECKED OUT
BORROWING
RETURNING
BOOKS CHECKED OUT
BORROWING
RETURNING
(STOCK)
(FLOW)
(FLOW)
:# of book
:# of book/day
:# of book/day
1.f. (5 points)
KNOWLEDGE
FORGETTING
LEARNING
KNOWLEDGE
LEARNING
FORGETTING
(STOCK)
(FLOW)
(FLOW)
: (dimensionless)
: (dimensionless)
: (dimensionless)
QUESTION 2: (34 points)
ORDERED BOOKS
NEW COMING BOOKS
Book Barrowing
BOOKS ON THE SHELVES
Book Indexing
Book Order Rate
Orders Receiv ed
Book Returning
BOOKS CHECKED OUT
The book circulation of a library can be summarized as follows:
Books that are ordered by the instructors (if it is a university library) or librarian come to the library after some
amount of time. After the books are received, they are indexed by the librarians and take place on the shelves of
the library. As a member of the library checks out a book, this book become unavailable for others and others
have to wait until the book is returned. Stocks and flows of the dynamic problem and their units are listed below:
VARIABLE
BOOK ORDER RATE
ORDERED BOOKS
ORDERS RECEIVED
NEW COMING BOOKS
BOOK INDEXING
BOOKS ON THE SHELVES
BOOK BORROWING
BOOKS RETURNING
STOCK/FLOW
(FLOW)
(STOCK)
(FLOW)
(STOCK)
(FLOW)
(STOCK)
(FLOW)
(FLOW)
ESC 577 – HOMEWORK #2 – ANSWER SHEET
UNIT
:# of books/month
:# of books
:# of books/month
:# of books
:# of books/month
:# of books
:# of books/month
:# of books/month
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ESC 577 - HOMEWORK 2 – ANSWER SHEET
QUESTION 3: (36 points)
ESC 577 – HOMEWORK #2 – ANSWER SHEET
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