A bird 150 ft above the ground flies horizontally at a speed of 11 ft/s. At what rate is the angle (in radians) between tne iine of sight from an observer on the ground and the vertical direction increasing when the distance between the observer and the bird is 300 ft?

2. A truck is moving at a rate of 90 km/hr., and the diameter of its wheels is 1 meter. Find the angular speed of the wheels in radians per minute 3. A water sprinkle sprays water on a lawn over a distance of 25 feet and rotates through an angle of 130 degrees. Find the area of the lawn watered by the sprinkle.

A rock is throw horizontally off a cliff.  After 3.0 seconds the velocity of the rock has an angle of 10° below the horizontal.  Determine the magnitude of the initial velocity of the rock.