https://w3id.org/framester/conceptnet5/data/en/electromagnetic_force <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/natural_phenomenon> <https://w3id.org/framester/conceptnet5/data/en/multi_dimensional_quantity> <https://w3id.org/framester/conceptnet5/data/en/force_vector> <https://w3id.org/framester/conceptnet5/data/en/electrical_quantity> risorse dalla linked data cloud