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NikAS [45]
3 years ago
5

Nitrogen at an initial state of 300 K,150 kPa and 0.2 m3is compressed slowly in an isothermal process to a final pressure of 800

kPa. Determine the work done to the nitrogen and the amount of heat transfer during this process.
Engineering
1 answer:
Dmitry_Shevchenko [17]3 years ago
3 0

Answer:

-50.22kJ

Explanation:

Given:

Initial state Temperature =300k

Pressure 1= 150kPa

Pressure 2 = 800kPa

Volume 1 = 0.2m^3

Work done = Pressure 1 × Volume 1 × (inverse of pressure 1 ÷ pressure 2)

= 150kPa × 0.2m^3 × (inv 150 kPa ÷800 kPa)

= - 50.22kJ

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Answer:

a) For this case the new time to run the FP operation would be reduced 20% so that means 100-20% =80% from the original time

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And since the new total time would be given by 250-14=236 s

b) For this case the total time is reduced 20%  so that means that the new total time would be (1-0.2)=0.8 times the original total time (1-0.2) *250s =200 s

The original time for INT operations is calculated as:

250 = 70+85+40 +t_{INT}

t_{INT}=55s

For this part the only time that was changed is assumed the INT operations so then:

200 = 70+85+40 \Delta t_{INT}

And then: \Delta t_{INT}= 200-70-85-40=5 s

c) A reduction of the total time implies that the total time would be 205 s from the results above. And the time for FP is 70, for L/S is 85 and for INT operations is 55 s, so then if we add 70+85+55=210s, we see that 210>205 so then we cannot reduce the total time 20% just reducing the branch intructions.

Explanation:

From the info given we know that a computer running a program that requires 250 s, with 70 s spent executing FP instructions, 85 s executed L/S instructions and 40 s spent executing branch instructions.

Part 1

For this case the new time to run the FP operation would be reduced 20% so that means 100-20% =80% from the original time

(1-0.2)*70 s =56s

The reduction on this case is 70-56 s=14s

And since the new total time would be given by 250-14=236 s

Part 2

For this case the total time is reduced 20%  so that means that the new total time would be (1-0.2)=0.8 times the original total time (1-0.2) *250s =200 s

The original time for INT operations is calculated as:

250 = 70+85+40 +t_{INT}

t_{INT}=55s

For this part the only time that was changed is assumed the INT operations so then:

200 = 70+85+40 \Delta t_{INT}

And then: \Delta t_{INT}= 200-70-85-40=5 s

And we can quantify the decrease using the relative change:

\% Change = \frac{5s}{55 s} *100 = 9.09\% of reduction

Part 3

A reduction of the total time implies that the total time would be 205 s from the results above. And the time for FP is 70, for L/S is 85 and for INT operations is 55 s, so then if we add 70+85+55=210s, we see that 210>205 so then we cannot reduce the total time 20% just reducing the branch intructions.

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3 years ago
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