After 4 seconds of moving is the tip of the shadow moving a towards or away from the person and b towards or away from the wall.
Person walking from wall height light rate of change.
A 2 meter tall person is initially 10 meters from the wall and is moving towards the wall at a rate of 0 5 m sec.
If the person walks away from the the light as in our example his position x value is increasing and so dx dt is 1 5 m s a positive value.
A spotlight is located on the ground 40 ft from the wall.
The shadow height and its rate of change vary depending on the person s position.
A spotlight is located on the ground 40 ft from the wall.
James che brian alford and mani ramachandran torrey pines high school march 2011.
How fast does the height of the person s shadow on the wall change when the person is 10 ft from the wall.
The slider moves the person between the spotlight and the wall.
How fast is the height of the shadow changing when the person is 8 feet from the wall.
Is the shadow increasing or decreasing in height at this time.
The only thing that changes is the sign of the rates.
13 using the previous problem what is the rate at which the shadow changes when the person is 10 ft from the wall if the person is walking away from the wall at a rate of 2 ft sec.
A light is mounted on a wall 5 meters above the ground.
A 5 ft tall person walks toward a wall at a rate of 2 ft sec.
The classic related rates problem.
How fast does the height of the person s shadow on the wall change when the person is 10 ft from the wall.