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. 1m , ,<br />
2<br />
S = 1cm . , <br />
, h t <br />
.<br />
: , <br />
dV<br />
Q = = 0.62 S 2 g h<br />
d t<br />
<br />
<br />
d V = 0.62<br />
<br />
2gh<br />
d t<br />
<br />
h<br />
o<br />
h<br />
h<br />
r<br />
+ d h<br />
100cm<br />
[ t , t + d t ] h h + d h ( d h < 0),