Problem $3\mathrm{.}1$ A truck loaded with $2$ m$3$ dry sand appears to weigh $3$ tons$$ more

than the weight of the empty truck. What is the meaning of the term $3$ tons$,$ and

what is the volumetric weight of the sand?

Problem $3\mathrm{.}2$ If it is known that the density of the sand particles in the material

of the previous problem is $2600$ kg$/$m$3,$ then what is the porosity n$?$ And the void

ratio e$?$