A charge Q = -610 nC is uniformly distributed on a ring of 2…

A charge Q = -610 nC is uniformly distributed on a ring of 2.4-m radius. A point charge q = +480 nC is fixed at the center of the ring, as shown in the figure. An electron is projected from very far away toward the ring along the axis of the ring. This electron comes to a momentary halt at a point on the axis that is 5.0 m from the center of the ring. What is the initial speed of the electron? (mel = 9.11 × 10-31 kg)

Acquired immunity involves both a humoral immune response an…

Acquired immunity involves both a humoral immune response and a cell-mediated immune response.    Match the items into the appropriate category depending on whether they are involved in the humoral response, the cell-mediated response, or both the humoral and the cell-mediated responses.