Find New Density of Heated Cube

[robertsa]

Homework Statement

if the original density of a cube is 869 kg/m3 and volume 125cm3.. the cube is is heated to a new volume of 125.00255cm3 what's the new density

 

[rl.bhat]

When you heat the cube, which quantity remains constant?

 

[ideasrule]

Can you tell us what equations you think are relevant and how you've attempted the problem?

 

[robertsa]

Well i found the new volume first using Change V/V= linear expansion coeffecient(change tmp)... orginal v =125cm3...Delta V/125=17x10^-6 x 50... Change V=.31875 so the new volume is 125.31875cm^3... but I don't know how to find the new density..d=m/v... would mass not change even though the voume did

 

[ideasrule]

Mass doesn't change because the number of atoms in the material doesn't change. So yes, find the mass.