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3 years ago

Which of these personal protective equipment items prevents injury from falling objects ?

1 answer:

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OSHA requires that if you work in an environment in which you're at risk of being hit by something that falls, you must: Secure tools and materials to prevent them from falling on people below. Barricade hazard areas and post warning signs. Use toe boards, screens on guardrails or scaffolds to prevent falling objects.

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Select the correct answer. Linda has written a program that works well on various operating systems, but she needs to increase t

FinnZ [79.3K]

The best answer in this case to improve readability of the program is for Linda to improve the structure (Answer C). Code structure in a program can help convey logic and make the code much more readable to the user. This can include things like using tabs and spacing more effectively, and adding functions that can be called instead of repeating the same lines of code in order to repeat a certain process.

8 0

3 years ago

Disk requests come in to the disk driver for cylinders 10, 22, 20, 2, 40, 6, and 38, in that order. A seek takes 6 msec per cyli

oksano4ka [1.4K]

Answer:

For FCFS = 876msec For SSTF = 360msec For SCAN(elevator) = 348msec

Explanation:

Considering FCFS algorithm.

In FCFS, the requests are addressed in the order they arrive in the disk queue, this means that the number of cylinders traveled becomes equal to the total of disk requests. With the arm initially at 20, the first request is to read cylinder 10.

Therefore the cylinders traversed for the first request = 20 – 10 = 10

For the second request i.e. a movement from cylinder 10 to cylinder 22, the number of cylinders traversed is = 22 - 10 = 12.

Similarly, for the third request seek arm will return to 20 from 22 so, cylinders traversed through would be = 22-20 = 2.

Also for the fourth request, cylinders traversed would be = 20 – 2 = 18.

For the fifth request, cylinders traversed = 40 – 2 = 38.

Now for the sixth request cylinders traversed = 40 – 6 = 34.

For the seventh and last request, cylinders traversed = 38 – 6 = 32.

So now to get the how much seek time is required for Disk scheduling algorithm

First we would add the total cylinders traversed = 10 + 12 + 2+ 18+ 38 + 34 + 32

= 146 cylinders

So therefore the total seek time = number of cylinders traversed X seek time per cylinder

= 146 X 6

= 876msec

Considering SSTF algorithm.

In SSTF (Shortest Seek Time First), requests having shortest seek time are executed first. So, the seek time of every request is calculated in advance in the queue and then they are scheduled according to their calculated seek time. What this means is that the closest disk (cylinder) next to the position of the seek arm is attended to first. With the arm at 20 initially, the first request is to read cylinder 22 (i.e. the closest cylinder to the seek arm)

Therefore the cylinders traversed for the first request = 22-20 = 2

For the second request, the disk to focus on is disk 20 and the cylinders traversed = 22-20 = 2

Similarly for the third request the seek arm will move to 10 from 20 so, cylinder traversed = 20-10 =10

For fourth request, cylinder traversed = 10 – 6 = 4

For the fifth request, cylinder traversed = 6 – 2 = 4

For sixth request, since all other disk request closer to it has been attended to the seek arm will move to disk 38 to attend to that disk request So, the cylinder traversed = 38 – 2 = 36

For the last request, cylinder traversed = 40 -38 = 2

So now to get the how much seek time is required for Disk scheduling algorithm

First we would add the total cylinders traversed = 2 + 2 +10 + 4 + 4 + 36 + 2

= 60 cylinders

So therefore the total seek time = number of cylinders traversed X seek time per cylinder

= 60 X 6 = 360msec

From Here we see that SSTF is better or an improvement to FCFS as it decrease the average response time (Average Response time is the response time of the all requests).

Considering SCAN (elevator) algorithm

In SCAN algorithm the disk arm moves into a particular direction and services the requests coming in its path and after reaching the end of disk, it reverses its direction and again services the request arriving in its path. So, this algorithm works as an elevator and hence also known as elevator algorithm. Therefore the number of cylinder traveled becomes equal to the total of disk request. With the arm at 20 initially

The first request is to read cylinder 22 i.e. the first cylinder on the upward movement

Therefore the cylinders traversed would be = 20 – 22 = 2

For the second request is to read cylinder 38, and the cylinders traversed would be = 38 – 22 =16

For the third request, seek arm will move to 40 So, the cylinders traversed would be = 40 – 38 = 2

For the fourth request, seek arm will return to 20 since from 40 since 40 is the highest in this upward elevator movement So, cylinders traversed would be = 40 -20 = 20

For the fifth request, cylinder traversed would be = 20 – 10 = 10

For the sixth request, cylinder traversed would be = 10 – 6 = 4

For the seventh and last request, cylinder traversed = 6 – 2 = 4

So now to get the how much seek time is required for Disk scheduling algorithm

First we would add the total cylinders traversed = 2 + 16 + 2 + 20 +10+ 4 + 4 = 58 cylinders

So therefore the total seek time = number of cylinders traversed X seek time per cylinder

= 58 X 6

= 348msec

From Here we see that SCAN is better or an improvement to FCFS and SSTF as it decrease the average response time (Average Response time is the response time of the all requests).

6 0

3 years ago

A. True

vitfil [10]

The answer would be True.

8 0

3 years ago

Your organization's network has multiple layers of security devices. When you attempt to connect to a service on the Internet. H

Sindrei [870]

Answer:

The host-based firewall settings are blocking the service

Explanation:

Host-based firewall settings can be configured on each workstation. The firewall can be provided by the operating system itself, or it can be a standalone software package that provides security features and functionality for the device's network connection. If this firewall contains incorrect settings, legitimate services can be blocked, and if so, a message will usually notify the user of such a breach. In these cases, the firewall settings need to be adjusted to make the desired service work.

7 0

3 years ago

Consider a physical transmission medium of capacity C bits/sec between two stations that have I bits of information sent/receive

levacccp [35]

Answer:

Check the explanation

Explanation:

when calculating the total time to send the I bits of information or The packet delivery time or latency which can be said to be the amount of time from when the first bit leaves the point of transmission until the last is received. When it comes to a physical link, it can be computed or determined as: Packet delivery time = Transmission time + Propagation delay.

Kindly check the attached image below to get the step by step explanation to the above question.

5 0

3 years ago