Engineering, 03.04.2020 17:20 lexie7752
Given the following characteristics for a magnetic disk pack with 10 platters yielding 18 recordable surfaces (not using the top and bottom surfaces):
Rotational speed = 13 ms
Transfer rate = 0.15 ms/track
Density per track = 19,000 bytes
Number of records to be stored = 200,000 records
Size of each record = 160 bytes
Block size = 10 logical records
Number of tracks per surface = 500
Find the following:
a. Number of blocks per track
b. Waste per track
c. Number of tracks required to store the entire file
d. Total waste to store the entire file
e. Time to write all of the blocks (Use rotational speed; ignore the time it takes to move to the next track.)
f. Time to write all of the records if they’re not blocked. (Use rotational speed; ignore the time it takes to move to the next track.)
g. Optimal blocking factor to minimize wasted space
h) What would be the answer to (e) if the time it takes to move to the next track were 5 ms?
i) What would be the answer to (f) if the time to takes to move to the next track were 5 ms?
Answers: 2
Engineering, 03.07.2019 14:10
If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.
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Engineering, 04.07.2019 18:10
A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.
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Engineering, 04.07.2019 18:20
What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.
Answers: 3
Engineering, 04.07.2019 19:10
Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj
Answers: 2
Given the following characteristics for a magnetic disk pack with 10 platters yielding 18 recordable...
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