A model rocket is launched straight upward. Its altitude y as a function of time is given by y = bt - ct2 , where b = 82 m/s, c = 4.9 m/s2 , t is the time in seconds, and y is in meters. (a) Use differentiation to find a general expression for the rockets velocity as a function of time. (b) When is the velocity zero?

Lecture 15 2 How to produce B-field • Changing E-field • Electric currents • flowing electrons • nuclear and electron spins and orbital motion Magnetism in a materials ▪ Paramagnetic materials (amplify the external B-field) ▪ Diamagnetic (decrease the external B-field) ▪ Ferromagnetic...