•  14
    Bell’s spaceship ‘paradox’ [1] in special relativity is a particularly good one to examine with students, because although it deals with accelerated motions, it can be dissolved with elementary space–time diagrams. Furthermore, it forces us to be very clear about the relativity of simultaneity, proper length, and the ‘reality’ of the Lorentz contraction
  •  5
    Our goal here is to determine the spatial and temporal constraints on communication between two observers at least one of which moves with constant proper acceleration in two-dimensional Minkowski spacetime. We take as a simplified model of communication one observer bouncing a light signal off another observer. Our derivations use only elementary mathematics and spacetime diagrams, and hence are accessible to students taking their first course in special relativity. Furthermore, the qualitative…Read more
  •  32
    The equivalence of mass and energy
    Stanford Encyclopedia of Philosophy. forthcoming.