Problem # $16$

Given the pulley system, what is the force required to raise the $3[$kN$]$ load?

a$)0\mathrm{.}5[kN]$

b$)0\mathrm{.}67[kN]$

c$)1[kN]$

d$)1\mathrm{.}5[kN]$

Problem # $17$

A $120[cm]-$long hollow aluminum tube with an inner and outer diameter of $7\mathrm{.}5[cm]$ and $10[cm],$ respectively, is fixed at one end. The other end experiences a $9[kN]$ torque. If $G=28[$GPa$],$ what is the maximum shear stress in the shaft

a$)8[MPa]$

b$)33[MPa]$

c$)46[MPa]$

d$)67[MPa]$

e$)134[MPa]$

f$)$ None of the above