Problem $1.$

$($L$.$O$.0\mathrm{.}1\mathrm{.}1)$

$($Hibbeler$,2015)$

Determine to three significant figures the gravitational force acting between two spheres that are touching each other. The mass of each sphere is $1Mg$ and the radius is $300mm.$

Hint: Include a sketch or figure of the system in the solution.

$F=G\frac{m_1{m}_2}{r^2}$

Problem $2.($L$.$O$.0\mathrm{.}1\mathrm{.}1)$

$($Hibbeler$,2015)$

A concrete column has a diameter of $400mm$ and a length of $2m.$ If the density of concrete is $2\mathrm{.}45M\frac{g}{m^3}$ determine the weight of the column in pounds force.

Hint: Include a sketch or figure of the system in the solution.