<p>a]ta co
<p>Fa=d.V=0,003.10000=30(N)<sub>
<p>b] taco': trong luc cuavat bi nhan chim va vat noi len =nhau=>1/3.0,003.10000=2/3.0,003.dvat<br>
<p>dvat=5000[N/m^3]
<p>khoi luongcuavat la :m=D.V=d/10.V=500.0,003=1,5
<p>C-H-U-C-B-A-N-H-O-C-T-O-T-T-I-C-K-C-H-O-M-I-N-H-N-H-E
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