Consider a disk that rotates at 3600 rpm. The seek time to move the head between adjacent tracks is 2 ms. There are 32 sectors per track, which are stored in linear order from sector 0 through sector 31. The head sees the sectors in ascending order. Assume the read/write head is positioned at the start of sector 1 on track 8. There is a main memory buffer large enough to hold an entire track. Data is transferred between disk locations by reading from the source track into the main memory buffer and then writing the data from the buffer to the target track. a. How long will it take to transfer sector 1 on track 8 to sector 1 on track 9

Answer:

The SANS Top 20 Critical Security Controls For Effective Cyber Defense

Explanation:

Password/PIN Policy

Developing a password and personal identification number policy helps ensure employees are creating their login or access credentials in a secure manner. Common guidance is to not use birthdays, names, or other information that is easily attainable.

Device Controls

Proper methods of access to computers, tablets, and smartphones should be established to control access to information. Methods can include access card readers, passwords, and PINs.

Devices should be locked when the user steps away. Access cards should be removed, and passwords and PINs should not be written down or stored where they might be accessed.

Assess whether employees should be allowed to bring and access their own devices in the workplace or during business hours. Personal devices have the potential to distract employees from their duties, as well as create accidental breaches of information security.

As you design policies for personal device use, take employee welfare into consideration. Families and loved ones need contact with employees if there is a situation at home that requires their attention. This may mean providing a way for families to get messages to their loved ones.

Procedures for reporting loss and damage of business-related devices should be developed. You may want to include investigation methods to determine fault and the extent of information loss.

Internet/Web Usage

Internet access in the workplace should be restricted to business needs only. Not only does personal web use tie up resources, but it also introduces the risks of viruses and can give hackers access to information.

Email should be conducted through business email servers and clients only unless your business is built around a model that doesn't allow for it.

Many scams and attempts to infiltrate businesses are initiated through email. Guidance for dealing with links, apparent phishing attempts, or emails from unknown sources is recommended.

Develop agreements with employees that will minimize the risk of workplace information exposure through social media or other personal networking sites, unless it is business-related.

Encryption and Physical Security

You may want to develop encryption procedures for your information. If your business has information such as client credit card numbers stored in a database, encrypting the files adds an extra measure of protection.

Key and key card control procedures such as key issue logs or separate keys for different areas can help control access to information storage areas.

If identification is needed, develop a method of issuing, logging, displaying, and periodically inspecting identification.

Establish a visitor procedure. Visitor check-in, access badges, and logs will keep unnecessary visitations in check.

Security Policy Reporting Requirements

Employees need to understand what they need to report, how they need to report it, and who to report it to. Clear instructions should be published. Training should be implemented into the policy and be conducted to ensure all employees understand reporting procedures.

Empower Your Team

One key to creating effective policies is to make sure that the policies are clear, easy to comply with, and realistic. Policies that are overly complicated or controlling will encourage people to bypass the system. If you communicate the need for information security and empower your employees to act if they discover a security issue, you will develop a secure environment where information is safe.

Answer:

anyone know if the other answer in right?

Explanation:

Answer:

D is correct

Explanation:

Think of it by plugging in values. Clearly the exponential version, according the graph, is more efficient with lower values. But then it can be seen that eventually, the linear will become more efficient as the exponential equation skyrockets. D is the answer.

Answer:

Block Chain is a system of recording information that makes it difficult or impossible to change, hack, or cheat the system.

A blockchain is essentially a digital ledger of transactions that is duplicated and distributed across the entire network of computer systems on the blockchain.

Hope this helps.

x

Answer:

In Python:

year = int(input("Year: "))

if (year % 4) == 0:

  if (year % 100) == 0:

      if (year % 400) == 0:

          print("Leap year")

      else:

          print("Not a leap year")

  else:

      print("Leap year")

else:

  print("Not a leap year")

Explanation:

This line prompts user for year

year = int(input("Year: "))

This condition checks if input year is divisible by 4

if (year % 4) == 0:

If yes, this condition checks if input year is divisible by 100

  if (year % 100) == 0:

If yes, this condition checks if input year is divisible by 400

      if (year % 400) == 0:

If divisible by 4, 100 and 400, then it is a leap year

          print("Leap year")

      else:

If divisible by 4 and 100 but not 400, then it is not a leap year

          print("Not a leap year")

  else:

If divisible by 4 but not 100, then it is a leap year

      print("Leap year")

else:

If it is not divisible by, then it is not a leap year

  print("Not a leap year")

Answer:

Use the stack data structure with both best-case and worst-case time complexity of O(1) for insertion and deletion of elements.

Explanation:

The stack data structure is used in programs to hold data for which the last data in the stack is always popped out first when retrieving the data sequentially, that it, first-in, last-out.

The elements in the stack are located in an index location, which means that they can be retrieved directly by choice with constant time complexity of 1 or O(1) for best and worst-case.

So inserting, and deleting the minimum and maximum elements in the stack data structure executes at a speed of the constant 1 (big-O notation, O(1) ).

Answer:

D. Refrigerants

Explanation:

In the United States of America, the agency which was established by US Congress and saddled with the responsibility of overseeing all aspects of pollution, environmental clean up, pesticide use, contamination, and hazardous waste spills is the Environmental Protection Agency (EPA). Also, EPA research solutions, policy development, and enforcement of regulations through the resource Conservation and Recovery Act .

The Clean Air Act Amendments of 1990 prohibit service-related releases of all refrigerants such as R-12 and R-134a. This ban became effective on the 1st of January, 1993.

Refrigerants refers to any chemical substance that undergoes a phase change (liquid and gas) so as to enable the cooling and freezing of materials. They are typically used in air conditioners, refrigerators, water dispensers, etc.

Answer:

D

Explanation:

Answer:

fraction = input("enter fraction x/y: ")

if len(fraction) == 3:

   if fraction[1] == "/":

       try:

           num = int(fraction[0])

           den = int(fraction[2])

           if num < den:

               print(f"{num}/{den} is a proper fraction")

           else:

               if num% den == 0

                   print(f"{num}/{den} is an improper fraction and can be reduced to {num/den}")

               else:

                   print(f"{num}/{den} is an improper fraction and can be reduced to {num//den} + {num - (den * (num//den))}/{den}")

       except ValueError:

           print("numerator and denominator must be integer numbers")

Explanation:

The try and except statement of the python program is used to catch value error of the input fraction of values that are not number digits. The program converts the numerator and denominator string values to integers and checks for the larger value of both.

The program prints the fraction as a proper fraction if the numerator is lesser and improper if not.

ok sorry i cant help u with this

Answer:

mass = float(input("Mass: "))

velocity = float(input("Velocity: "))

momentum = mass * velocity

print("The object's momentum is ", momentum)

Explanation:

*The code is in Python.

Ask the user to enter the mass and velocity. Since both of the values could be decimal numbers, cast them as float

Calculate the momentum using given information, multiply mass by velocity

Print the momentum as example output

Answer:

In C:

#include <stdio.h>

int main() {

   int mynum;

   scanf("%d", &mynum);

   if(mynum%3 == 0 && mynum%5 != 0){

       printf("CS");    }

   else if(mynum%5 == 0 && mynum%3 != 0){

       printf("1714");    }

   else if(mynum%3 == 0 && mynum%5 == 0){

       printf("CS1714");    }

   else    {

       printf("ERROR");   }

   return 0;

}

Explanation:

This declares mynum as integer

   int mynum;

This gets user input

   scanf("%d", &mynum);

This condition checks if mynum is divided by 3. It prints CS, if true

   if(mynum%3 == 0 && mynum%5 != 0){

       printf("CS");    }

This condition checks if mynum is divided by 5. It prints 1714, if true

   else if(mynum%5 == 0 && mynum%3 != 0){

       printf("1714");    }

This condition checks if mynum is divided by 3 and 5. It prints CS1714, if true

   else if(mynum%3 == 0 && mynum%5 == 0){

       printf("CS1714");    }

This condition checks if num cannot be divided by 3 and 5. It prints ERROR, if true

   else    {

       printf("ERROR");    }

Answer:

media frame all news items by specific values, facts, and other considerations, and endowing them with greater apparent for making related judgments

Explanation:

Answer:

The answer is "option b and option d"

Explanation:

In this question, both choice "b and c" is correct because Java is compiled and run on a JVM  and it uses the byte code. On the other hand, PHP has interpreted language, that compiled into the bytecode after that the output engine interpreted. Similarly, the COBOL is used for enterprise, finance, and administrative systems, and PHP is used in web creation.

Answer:

B

Explanation:

Answer:

B is the answer

Explanation:

Answer:

Create a small, collapsible navigation bar at the top of the home page so users can see new topics without scrolling

Explanation:

By so doing the user experience on the website would be improved because, instead of struggling through several pages to read through discussion threads, they can simply click on the navigation bar and pick a discussion topic that interests them.

Answer:

D. The object in a program is called a class.

Explanation:

Java is a object oriented and class-based programming language. It was developed by Sun Microsystems on the 23rd of May, 1995. Java was designed by a software engineer called James Gosling and it is originally owned by Oracle.

In object-oriented programming (OOP) language, an object class represents the superclass of every other classes when using a programming language such as Java. The superclass is more or less like a general class in an inheritance hierarchy. Thus, a subclass can inherit the variables or methods of the superclass.

Basically, all instance variables that have been used or declared in any superclass would be present in its subclass object.

Hence, the relationship between an object and class in an OOP program is that the object in a program is called a class.

For example, if you declare a class named dog, the objects would include barking, color, size, breed, age, etc. because they are an instance of a class and as such would execute a method defined in the class.

Answer:

Explanation:

The following code is written in Python. It is a function that takes the three arrays as parameters. It loops over the first array comparing to see if a number exists in the other arrays. If it finds a number in all three arrays it adds it to an array called same_elements. Finally, it prints the array.

def has_same_elements(arr1, arr2, arr3):

   same_elements = []

   for num1 in arr1:

       if (num1 in arr2) and (num1 in arr3):

           same_elements.append(num1)

       else:

           continue

   print(same_elements)

Answer:

An array.

Explanation:

An array can be defined as a structure that organizes data in a list that is commonly 1-dimensional or 2-dimensional.

Simply stated, an array refers to a set of memory locations (data structure) that comprises of a group of elements with each memory location sharing the same name. Therefore, the elements contained in array are all of the same data type e.g strings or integers.

Basically, in computer programming, arrays are typically used by software developers to organize data, in order to search or sort them.

Binary search is an efficient algorithm used to find an item from a sorted list of items by using the run-time complexity of Ο(log n), where n is total number of elements. Binary search applies the principles of divide and conquer.

In order to do a binary search on an array, the array must first be sorted in an ascending order.

Hence, array elements are mainly stored in contiguous memory locations on computer.

substitution and transport

Answer:

In Python:

#1

service = input("Enter desired auto service: ")

print("You entered: "+service)

#2

if service.lower() == "oil change":

   print("Cost of oil change: $35")

elif service.lower() == "car wash":

   print("Cost of car wash: $7")

elif service.lower() == "tire rotation":

   print("Cost of tire rotation: $19")

else:

   print("Invalid Service")

Explanation:

First, we prompt the user for the auto service

service = input("Enter desired auto service: ")

Next, we print the service entered

print("You entered: "+service)

Next, we check if the service entered is available (irrespective of the sentence case used for input). If yes, the cost of the service is printed.

This is achieved using the following if conditions

For Oil Change

if service.lower() == "oil change":

   print("Cost of oil change: $35")

For Car wash

elif service.lower() == "car wash":

   print("Cost of car wash: $7")

For Tire rotation

elif service.lower() == "tire rotation":

   print("Cost of tire rotation: $19")

Any service different from the above three, is invalid

else:

   print("Invalid Service")

Answer:

In Python:

loop = True

while(loop):

   nm1 = float(input("Number 1: "))

   nm2 = float(input("Number 2: "))

   nm3 = float(input("Number 3: "))

   if (nm1 >= 0 and nm2 >= 0 and nm3 >= 0):

       result = nm2 * nm3 + nm1

       print("Result: "+str(result))

       loop = True

   else:

       print("All inputs must be greater than or equal to 0")

       loop = True

Explanation:

First, we set the loop to True (a boolean variable)

loop = True

This while loop iterates, indefinitely

while(loop):

The next three lines prompt user for three numbers

   nm1 = float(input("Number 1: "))

   nm2 = float(input("Number 2: "))

   nm3 = float(input("Number 3: "))

The following if condition checks if all of the numbers are greater than or equal to 0

   if (nm1 >= 0 and nm2 >= 0 and nm3 >= 0):

If yes, the result is calculated

       result = nm2 * nm3 + nm1

... and printed

       print("Result: "+str(result))

The loop is then set to true

       loop = True

   else:

If otherwise, the user is prompted to enter valid inputs

       print("All inputs must be greater than or equal to 0")

The loop is then set to true

       loop = True

Answer:

yes its true  :)

Explanation:

Answer:

Answered below.

Explanation:

#Answer is written in Python programming language

#Get inputs

radius = float(input("Enter radius in inches: "))

height = float(input("Enter height in feet: "))

#Convert height in feet to height in inches

height_in_inches = height * 12

#calculate volume in cubic inches

volume = 3.14 * (radius**2) * height_to_inches

#convert volume in cubic inches to volume in gallons

volume_in_gallons = volume * 0.00433

#output result

print (volume_in_gallons)

Answer:

b. Person p = new Person ("Homer", 23);

Explanation:

The statement that will create an object that represents an adult person would be the following

Person p = new Person ("Homer", 23);

This statement creates a Person object by called the Person class and saving it into a variable called p. The Person method is called in this object and passed a string that represents the adult's name and the age of the adult. Since the age is greater than 18, the method will return that adult = true.

The other options are either not passing the correct second argument (needs to be an int) or is passing an int that is lower than 18 meaning that the method will state that the individual is not an adult.

Answer:

Attached please find my solution in JAVA

Explanation:

long hashMap(String[] queryType, int[][] query) {

       long sum = 0;

       Integer currKey = 0;

       Integer currValue = 0;

       Map<Integer, Integer> values = new HashMap<>();

       for (int i = 0; i < queryType.length; i++) {

           String currQuery = queryType[i];

           switch (currQuery) {

           case "insert":

               HashMap<Integer, Integer> copiedValues = new HashMap<>();

               if (currKey != 0 || currValue != 0) {

                   Set<Integer> keys = values.keySet();

                   for (Integer key : keys) {

                       copiedValues.put(key + currKey, values.get(key) + currValue);

                   }

                   values.clear();

                   values.putAll(copiedValues);

                   currValue = 0;

                   currKey = 0;

               }

               values.put(query[i][0], query[i][1]);

               break;

           case "addToValue":

               currValue += values.isEmpty() ? 0 : query[i][0];

               break;

           case "addToKey":

               currKey += values.isEmpty() ? 0 : query[i][0];

               break;

           case "get":

               copiedValues = new HashMap<>();

               if (currKey != 0 || currValue != 0) {

                   Set<Integer> keys = values.keySet();

                   for (Integer key : keys) {

                       copiedValues.put(key + currKey, values.get(key) + currValue);

                   }

                   values.clear();

                   values.putAll(copiedValues);

                   currValue = 0;

                   currKey = 0;

               }

               sum += values.get(query[i][0]);

           }

       }

       return sum;

   }

Answer:

mkdir homeworks    // make a new directory called homeworks.

touch homework_instructions.txt //create a file called homework_instruction

sudo -i    // login as root user with password.

chmod u+rwx homework_instructions.txt  // allow user access all permissions

chmod go-wx homework_instructions.txt // remove write and execute permissions for group and others if present

chmod go+r homework_instructions.txt  // adds read permission to group and others if absent.

grep POINTS homework_instructions.txt | ls -n

Explanation:

The Linux commands above first create a directory and create and save the homework_instructions.txt file in it. The sudo or su command is used to login as a root user to the system to access administrative privileges.

The user permission is configured to read, write and execute the text file while the group and others are only configured to read the file.

Answer:

[tex]\pi[/tex]

Explanation:

Answer:

Explanation:

The following code is written in Java and uses Switch statements to connect the month to the correct number of days. It uses the year value to calculate the number of days only for February since it is the only month that actually changes. Finally, the number of days is printed to the screen.

import java.util.Scanner;

public class NumDaysPerezGabriel {

   public static void main(String args[]) {

       int totalDays = 0;

       Scanner in = new Scanner(System.in);

       System.out.println("Enter number for month (Ex: 01 for January or 02 for February): ");

       int month = in.nextInt();

       System.out.println("Enter 4 digit number for year: ");

       int year = in.nextInt();

       switch (month) {

           case 1:

               totalDays = 31;

               break;

           case 2:

               if ((year % 400 == 0) || ((year % 4 == 0) && (year % 100 != 0))) {

                   totalDays = 29;

               } else {

                   totalDays = 28;

               }

               break;

           case 3:

               totalDays = 31;

               break;

           case 4:

               totalDays = 30;

               break;

           case 5:

               totalDays = 31;

               break;

           case 6:

               totalDays = 30;

               break;

           case 7:

               totalDays = 31;

               break;

           case 8:

               totalDays = 31;

               break;

           case 9:

               totalDays = 30;

               break;

           case 10:

               totalDays = 31;

               break;

           case 11:

               totalDays = 30;

               break;

           case 12:

               totalDays = 31;

       }

       System.out.println("There are a total of " + totalDays + " in that month for the year " + year);

   }

}