Consider a file system on a disk that has both logical and physical block sizes of 512 bytes. Assume that the information about each file is already in memory (i. e. the file control block and its metadata are in memory but everything else (such as the data or index blocks) are not). For each of the three allocation strategies (contiguous, linked, and indexed), answer these questions:

(a) How is the logical-to-physical address mapping accomplished in this system? (For the indexed allocation, assume that a file is always less than 512 blocks long.)
Contiguous:
Linked:
Indexed:

(b) If we are currently at logical block 10 (i. e. the last block accessed was block 10) and want to access logical block 4, how many physical blocks must be read from the disk?

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Which of these is most responsible for differences between the twentieth century to the twenty-first century?

Write a function balancechemical to balance chemical reactions by solving a linear set of equations. the inputs arguments are: reagents: symbols of reagents in string row array products: symbols of products in string row array elements: elements in the reaction in string row array elcmpreag: elemental composition of reactants in two dimensional numeric array elcmpprdcts: elemental composition of prducts in two dimensional numeric array hint: the first part of the problem is setting up the set of linear equations that should be solve. the second part of the problem is to find the integers from the solution. one way to do this is to mulitiply the rational basis for the nullspace by increasing larger integers until both the left-and right-side integers exist. for example, for the reaction that involves reacting with to produce and : reagents=["ch4", "o2"]; products =["co2", "h2o"]; elements =["c","h", "o"] elcmpreag=[1,4,0;