From Elementary physics, we know that, when an object is subjected to a constant acceleration a, the relationship between distance d and time t is given by d = ½at2. Suppose that, during a seek, the disk in Exercise 13.2 accelerates the disk arm at a constant rate for the first half of the seek, then decelerates the disk arm at the seek rate for the second half of the seek. Assume that the disk can perform a seek the an adjacent cylinder in 1 millisecond, and a fill-stoke seek over all 5000 cylinders in 18 milliseconds.
a. The distance of a seek is the number of cylinders that the head moves. Explain why the
seek time is proportional to the square root of the seek distance.
The head accelerates and decelerates and the same constant for equal amounts of time.
Therefore we can rewrite the equations d = ½ t2, or ((d*2)1/2) = t.
b. Write and equation for time as a function of distance. ((d*2)1/2) = t.
c. Calculate the total seek time for each of the schedules in Exercise 13.2. Determine
which schedule is the fastest (has the smallest total seek time).
86, 1470, 913, 1774, 948, 1509, 1022, 1750, 130
a.) FCFS = 327.8
b.) SSTF = 137.2
c.) SCAN = 148.6 – SCAN goes to zero which adds time
d.) LOOK = 137.2 – These are the same because the
e.) C-SCAN = 137.2 - starting point is the left most value
d. The percentage speedup is the time saved divided by the original time. What is the
percentage speedup of the fastest schedule over FCFS?
327.8-137.2 = 190.6
190.6/327.8 = .58 or 58%
13.16 The reliability of a hard-disk drive is typically described in tems of a quantity called mean time between failures (MTBF). Although this quantity is call a “time”, the MTBF is measured in drive-hours per failure.
a. If a system contain 1,000 disk drives, each of which has a 750,000 hour MTBF, which of the following best describes how often a drive failure will occur in that disk farm: once per thousand years, once per century, once per decade, once per year, once per month, once pre week, once per minutes, or once per second?
750,000 drive-hours per failure / 1,000 drives = 7500 hours per failure or 313 days per failure.
In the poem “Cartoon Physics, part 1” by Nick Flynn, children are idealistic and naive in their beliefs, however knowledge causes their views to change. The author uses many literary elements to help the audience understand the theme.
This shows that there is a difference of 2cm between A and B, and B
2) Analyze the graph that compares the Segment Sequence numbers of the three scenarios. Why does the Drop_NoFast scenario have the slowest growth in sequence numbers?
For over two hundred centuries, mankind has wrestled with the problem of how to hit an object with another object. From the earliest days of the bow and arrow, to today's modern missile defense system, the need to achieve maximum accuracy and distance from a projectile has been critical to the survival of the human race. There are numerous of ways to solve the problem ranging from trial and error—as early man did—to advanced mathematics including trigonometry and calculus. (While the specific mathematical operations are beyond the scope of this work, we will briefly touch on the equations of motion and how they apply to projectile motion as the project progresses.)
The given total number of years is 250 calculated in part a. So, again the same process as the previous questions m (t)
Historians will continue to work to understand the religions of the Roman Empire. The truth will continue to evolve as new archeological evidence is discovered, new translations are formed, and the human race as a whole continues to better understand this important time in history.
?The history of Rome is shrouded in myth and legend.? Tales of glorious victories, conquering heroes, and vanquished foes color our perception of this legendary city.? Myth and reality are so closely intertwined that we would be remiss to examine the one without the other.? From a cluster of humble villages, arose a mighty people who would capture the admiration of the world for centuries thereafter.? To look at the history of Rome is to look at the history of civilization itself, for with Rome, modern civilization began.
The great Greek thinker Aristotle was born in 384 B.C. in Stagirus, a city in ancient Macedonia in northern Greece. At the age of eighteen Aristotle went to Athens to begin his studies at Plato's Academy. He stayed and studied at the Academy for nineteen years and in that time became both a teacher and an independent researcher. After Plato's death in 347 B.C. Aristotle spent twelve years traveling and living in various places around the Aegean Sea. It was during this time that Aristotle was asked by Philip of Macedon to be a private tutor to his son, Alexander. Aristotle privately taught Alexander for three years before he returned to Athens after Philip gained control of the Greek capital. During this period back in Athens Aristotle founded his own school, the Lyceum, where he taught for twelve years. In 323 B.C. Alexander the Great died and the Macedonians lost control of Athens. Aristotle was forced to leave and he died one year later in Chalcis, north of Athens, at the age of 62.
b. The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three,
The technology and engineering used within the Roman Republican and Empirical eras define the current understanding of Roman society today. The ingenuity of this immense people, specifically seen within contributions made to agricultural, mining, transportation, and most notably, civil engineering technologies, characterize modern interpretation and appreciation of Roman society. The advancements made by the Romans, engineers specifically, have allowed portions of ancient buildings, bridges, and temples to withstand millennia, permitting individuals around the world to admire and experience the magnificence of this great civilization. In addition to the cultural impact that the Romans have had upon modern society, the today’s scholars have been able to obtain and interpret sources of historical information that are rarely found anywhere else in the world. In this way, the world’s classical empires have been able to have lasting and significant impacts upon modern humanity.
Computer games have steadily become a form of mainstream entertainment ever since Pong was released back in 1958. Today, it is hard to find an electronics department in any store that doesn't carry some sort of computer game. "Big deal," you say, "Everyone knows about computer games. What does they have to do with physics?" Well, the technology for creating more powerful software is constantly advancing, and since games are a form of software, they too become more and more advanced. As games become more advanced, game developers aim to create games that offer a more realistic experience. The technology has advanced to such a stage that making the games look real is no problem, but making a truly immersive experience is something different. That's where physics comes in.
A label was put on the curved surface of the flywheel. The mass was winded up again. 7. The height h of the mass was measured. The height h was recorded.
Sir Isaac Newton is the man well known for his discoveries around the term, Motion. He came up with three basic ideas, called Newton’s three laws of motion.
Useful for the military, projectile motion can now be used for a number of weapons; which is when an object (like a bullet or cannon) is thrown-projected- and mov...
Thermodynamics is the branch of science concerned with the nature of heat and its conversion to any form of energy. In thermodynamics, both the thermodynamic system and its environment are considered. A thermodynamic system, in general, is defined by its volume, pressure, temperature, and chemical make-up. In general, the environment will contain heat sources with unlimited heat capacity allowing it to give and receive heat without changing its temperature. Whenever the conditions change, the thermodynamic system will respond by changing its state; the temperature, volume, pressure, or chemical make-up will adjust accordingly in order to reach its original state of equilibrium. There are three laws of thermodynamics in which the changing system can follow in order to return to equilibrium.