Răspunsuri

2014-05-18T22:41:53+03:00
2014-05-19T01:05:33+03:00
F1(scripete fix)=F2 /2 (scripetele mobil da cistig in forta de 2 ori)
F2= mg=100kg x 9,8 N/kg=980N
F1=980N/2=490 N
Raspuns: d)490N
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