Ответ:
F1l1=F2l2
F2=F1l1/l2=50*40/20=100 H
2) F1=20 H
F2=180 H
l2=9 cm
l1=F2l2/F1=180*9/20=81 cm
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Ответ:
F1l1=F2l2
F2=F1l1/l2=50*40/20=100 H
2) F1=20 H
F2=180 H
l2=9 cm
l1=F2l2/F1=180*9/20=81 cm