From: Giorgos Makris (giorgosmakris(@)hotmail.com)
Date: Τετ 25 Οκτ 2000 - 17:30:48 EEST

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>Loipon sumfwna me tin Geniki 8ewria tis Sxetikotitas
>uparxei i arxi tis isodunamias pou leei oti:
>an eiste mesa se ena asanser xwris pedio barutitas
>pou epitaxunetai pros ta panw me epitaxunsi g
>einai akribws to idio me to na briskeste panw stin epifaneia
>tis gis (ka8e planiti) me epitanunsi barutitas g.
>Isodunama leei oti an eiste se eleu8eri ptwsi (sto keno)
>einai san na eiste xwris pedio barutitas.
>Duo erwtiseis:
>1. H epitaxunsi mesa se ena oxima einai ais8iti
>kai malista 8anatifora an einai megali.
>Ti diafora exei apo tin epitaxunsi se pedio barutitas ?
>Se eleu8eri ptwsi giati den einai ais8iti i epitaxunsi ?
>2. An balete mia aktina LASER na kineitai ka8eta anamesa
>se duo teleiws parallila katoptra panw stin epifaneia tis gis
>ti troxia 8a kanei i aktina ?

Loipon as diakrinoume 4 periptwseis
A sto edafos tis gis
B se eleu8eri ptwsi stin gi (sto keno)
C xwris baritiko pedio akinitos
D xwris baritko pedio se asanser me epitaxunsi g pros ta panw

To para3eno einai oti periptwseis pou kanoun to idio einai A (akinitos) me tin D (epitaxunomenos)
B (peftei me g) me tin C (akinitos)

An balete ena elatirio or8io me baros stis 4 periptwseis 8a to katalabete to giati.
Stis A kai D to elatirio SYMPIEZETAI.
Stin A apo to edafos kai to baros tou
enw stin D apo to edafos kai ka8e simeio sumpiezei ta apo panw (afou ka8e simeio epitagxunetai).
Anti8eta stin B den sumpiezetai AN KAI EPITAGXYNETAI giati ka8e simeio tou exei baros pou to epitagxunei omoia. Auti einai i diafora anamesa stin epitaxunsi se oxima kai se pedio barutitas.
Auti i sumpiesi se ena oxima einai ais8iti kai paromoia nme tin sumpiesi sto edafos enos planiti.

An baloume mia aktina LASER na kineitai ka8eta anamesa se duo teleiws parallila katoptra panw stin epifaneia tis gis tote 8a pa8oume to sok tis zwis mas giati i aktina 8a PESEI (san na itan petra)
Eipame oti to A einai opws to D.
Kai o D 8a eblepe tin aktina na peftei
(enw stin periptwsi auti 8a itan akiniti gia ton C)

Bebaia den uparxei allos tropos na doume to fws na peftei giati se 1 second dianuei 300 ekatommuria metra (paei Selini) kai an peftei me g se 1 second peftei peripou 5 metra.

Swsta apantisan

Baggelis Kapoulas (plirws)
Solaxidis Basilis (gia tin aktina)
Tsoukalas Giorgos (gia tin epitaxunsi se oxima)

Giorgos Makris

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