Q. You are trying to photograph a bird sitting on a tree branch, but a tall hedge is blocking your view. However, as the drawing shows, a plane mirror reflects light from the bird into your camera. If x = 4.2 m and y = 3.9 m in the drawing, for what distance must you set the focus of the camera lens in order to snap a sharp picture of the bird's image?

Q. A baton twirler throws a spinning baton directly upward. As it goes up and returns to the twirler's hand, the baton turns through 5.20 revolutions. Ignoring air resistance and assuming that the average angular speed of the baton is 2.00 rev/s, determine the height to which the center of the baton travels above the point of release.