12 The diagram shows two blocks of a material whose critical angle is 40°. In block A, the ray strikes the inner surface with an angle of incidence of 30°. In block B, the ray's
angle of incidence is 50°.
a Copy and complete each diagram to show what happens when the ray strikes the surface.
Use the diagrams to explain what is meant by total internal reflection.

A58-kg boy swings a baseball bat, which causes a 0.140-kg baseball to move toward third base with a velocity of 38.0 m/s.

Heterogeneous mixture with larger particles that never settle is

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.