Đáp án:
3>
a>\(P = m.10 = 1350.10 = 13500N\)
b>\[D = \frac{m}{V} = \frac{{1350}}{{{{500.10}^{ - 3}}}} = 2700kg/{m^3}\]
c> \[d = \frac{P}{V} = \frac{{13500}}{{{{500.10}^3}}} = 27000N/{m^3}\]
4>
\[D = \frac{m}{V} = > m = D.V = {11300.250.10^{ - 3}} = 2825kg\]
\[P = m.10 = 2825.10 = 28250N\]
\[d = \frac{P}{V} = \frac{{28250}}{{{{250.10}^{ - 3}}}} = 113000N/{m^3}\]
