Find New Density of Heated Cube

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To find the new density of the heated cube, the original density is 869 kg/m3 with a volume of 125 cm3. Upon heating, the cube's volume increases to 125.00255 cm3, but the mass remains constant as the number of atoms does not change. The relevant equation for density is d = m/v, where mass is calculated from the original density and volume. The new density can be determined by using the original mass and the new volume. The final density will reflect the slight increase in volume while maintaining the same mass.
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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
 
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When you heat the cube, which quantity remains constant?
 
Can you tell us what equations you think are relevant and how you've attempted the problem?
 
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
 
Mass doesn't change because the number of atoms in the material doesn't change. So yes, find the mass.
 

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