- #1

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i drew the p-v graph of an gasoline engine cycle now i dont know how to calcualte work done. is it by calculating the area inside or how?

no need of formulas...just using the graph..

WORK DONE USING A GRAPH !

- Thread starter Apple4ever
- Start date

- #1

- 8

- 0

i drew the p-v graph of an gasoline engine cycle now i dont know how to calcualte work done. is it by calculating the area inside or how?

no need of formulas...just using the graph..

WORK DONE USING A GRAPH !

- #2

Doc Al

Mentor

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Yes, the work done per cycle equals the area enclosed by the PV diagram. Read this: http://hyperphysics.phy-astr.gsu.edu/Hbase/thermo/heaeng.html#c2"is it by calculating the area inside or how?

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- #3

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- #4

HallsofIvy

Science Advisor

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- #5

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Just a picture. now becaususe it's a p-v diagram. i got 31 full squares. i didnt count the half squares which are halfed because of the curve. do i need to count them all as well?

and if it's 31 then what is the unit do i have to use for the answer?

- #6

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As for units, you know that you're looking for the area of a pressure-volume plot. Thus the units of your area should be the same as the units of pressure multiplied by the units of volume. In an MLT system (mass, length, time) your units should be equivalent to:

[tex]ML^{2}T^{-2}[/tex]

or in other words, equivalent to a force times a length, which gives you work.

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