A rigid body, with three different principal moments (?1,?2,?3) is rotating at t = 0 about one of its principle axes (e3).

(a) Write down Euler’s equations for the body, you can assume zero torque

(b) If ?1 = ?, ?2 = 2? and ?3 = 1/2? is the motion stable under small kicks?

(c) What about if ?1 = ?, ?2 = 1/2? and ?3 = 4? ? Justify your answers in both instances

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.