10) A 280 kg medium grand piano is resting on an 18° inclined plane. In order to help get the piano up the plane you attach a rope to the piano and run it through a pulley system as
shown below. If the coefficient of static friction between the piano and the floor is 0.55,
with what force will you have to push to make the piano start to slide?

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.