engg mechanics -intro

8/3/2019 Engg Mechanics -Intro

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Deals with the state of rest or motion of

bodies

Historical Contributions: Archimedes ( 287 212 BC)

Galileo ( 1564 1642)

Newton ( 1642 1727)


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Einstein ( 1878 1955)

Schrodinger De- Broglie ( 1887 1965)

Students of AEC Bhongir ( 2011 2086)


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Greatest mathematician of all time

Accomplished physicist

Engineer

Astronomer

Philosopher


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Created field of hydrostatics

Founded fundamentals of mechanics

Discovered law of levers

Calculated centres of gravity for flat surfaces

and solids.


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2nd Punic War invented war machines todefend the city from the Roman siege (214-212 B.C.)

Machines included catapults, ropes, pulleys,and hook

Suggested the use of large mirrors to focusthe rays of the sun onto the Roman ships,thereby setting them on fire.
http://hassam.hubpages.com/hub/Some-Facts-About-The-Roman-Empirehttp://hassam.hubpages.com/hub/Some-Facts-About-The-Roman-Empire


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Given:ABandBCmake up a broken chord withBC>AB.Mis the midpoint of arcABCMFis perpendicular toBCArchimedes proved thatFis the midpoint of the broken chordABC.


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When the screw is turned, the water slides up thetube until it falls out of the top.


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If a polygon is inscribed within a circle, itsperimeter must be less than the circlescircumference.


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Similarly, if another polygon is circumscribedoutside a circle, its perimeter must be greater thanthe circles circumference.

Measuring both polygons perimeters and dividing

by the circles diameter gives a bound for thevalue of


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By using polygons with increasing numbers ofsides, the bound can be made more accurate.

Starting with a hexagon, Archimedes keptadding sides until he had polygons of 96sides which gave him a range of 310/71

engg mechanics -intro

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