Answer
A tie of particles 3, 4 and 6, then a tie of particles 1, 2, and 5
Work Step by Step
We are asked to rank the particles in order of mass; greatest first. Based on the triangle of Fig 37-14, we know that the length of the horizontal component of each triangle represents the mass energy, $mc^2$. Mass energy is a product of mass and so the higher the mass energy is, the higher the mass will be.
From the given triangles, particles 3, 4, and 6 have the most mass and are all equal. Particles 1, 2, and 5 are equal in mass and are each lower than particles 3, 4, and 6.
