1. The problem statement, all variables and given/known data Find the minimum uncertainty of the momentum of a small particle with mass m=1g, which is confined within a region of width a=1cm. 2. Relevant equations Delta(p)*Delta(x)>=hbar/2 3. The attempt at a solution Delta(p)*Delta(x)=hbar/2 Delta(p)*10^(-2)=hbar/2 Delta(p)=10^2*hbar/2 This looks pretty straightforward to me, but the given mass in this problem is what confuses me.