\textbf{191.} A metallic cubic block with dimensions $5\,\text{cm} \times 4\,\text{cm} \times 2\,\text{cm}$ and density $8\,\dfrac{\text{g}}{\text{cm}^3}$ is placed on a horizontal surface on one of its faces. What is the maximum pressure (in Pascals) that the block can exert on the surface? $\left(g = 10\,\dfrac{\text{N}}{\text{kg}}\right)$
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(1) $1.6 \times 10^3$ \hfill (2) $4 \times 10^3$ \hfill (3) $1.6 \times 10^4$ \hfill (4) $4 \times 10^4$
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