Question

L=20cm
l=20cm
hh40cm
ro=2,89/cm³
m=?​

Answer 1

 

$\displaystyle\bf\\L=20~cm\\l=20~cm\\h=40~cm\\\rho=2,\!89~g/cm^3\\m=?\\\\Rezolvare:\\\\V=L\times l\times h=20\times20\times40=16000~cm^3\\\\\rho=\frac{m}{V}\\\\ m=\rho\times V = 2,\!89 \times 16000=\boxed{\bf46240~g}=\boxed{\bf46,24~Kg}$

 

 

Answer 2

Explicație:

ro=m÷v

m=ro×v

v=s×h

s=arie=l × l=20×20=400cm pătrați

v=400×40=16000

m=2,89×16000=46240 g=46,24kg