How Do You Calculate the Center of Mass for Multiple Cubes?

[Oomair]

[SOLVED] Finding Center of mass

Homework Statement

Three cubes, of side 0, 20, and 30, are placed next to one another (in contact) with their centers along a straight line as shown in the figure. What is the position, along this line, of the CM of this system? Assume the cubes are made of the same uniform material and 0 = 2.5 cm.

Homework Equations

Xcm = m1x1 + m2x2.../ m1 + m2 +...

The Attempt at a Solution

it does not give the mass of the cubes, so i don't know how to relate to such a problem

 

[Dick]

If they have the same density, then you may not know the masses, but you know the ratio of the masses. That's all you need to know. Assume any density you like and work it out. Now choose another density and work it out. You'll get the same answer.