The position of a particle moving in an xy plane is given by with in meters and t in seconds. in unit-vector notation, calculate (a), (b), and (c) for t = 2.00 s. (d) what is the angle between the positive direction of the x axis and a line tangent to the particle's path at t = 2.00 s? give your answer in the range of (-180o; 180o).

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.