Related Rates: Shadow Problem with Moving Object

In summary, the man's shadow on the building decreases at a rate of 0.32m/s when he is 4m away from the building, based on the given information of his height, speed, and distance from the wall. This can be determined by using the similar triangles formed by the man, his shadow, and the wall.
  • #1
synergix
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Homework Statement


A spotlight on theground shines on a wall 12 m away. If a man 2m tall walks from the spotlight toward the building at a speed of 1.6m/s. how fast is the length of his shadow on the building decreasing when he is 4m from the building?

The Attempt at a Solution



x=4m dx/dt=1.6m/s dy/dt=?

I am kinda of stuck on this one. I know that as x decreases z and y will also decrease. But I am really not to sure how to proceed on this one any hints?
 
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  • #2
You need a relation between x, the distance from the wall and y, the height of the shadow. Draw a picture and find two similar triangles.
 
Last edited:

Related to Related Rates: Shadow Problem with Moving Object

What is a related rates shadow problem?

A related rates shadow problem is a type of mathematical problem that involves finding the rate of change of one variable with respect to another variable, using the relationships between the two variables and the given rates of change.

How do you solve a related rates shadow problem?

To solve a related rates shadow problem, you need to identify the variables involved and the given rates of change. Then, you can use the chain rule and implicit differentiation to find the relationship between the variables and set up an equation. Finally, you can solve the equation to find the rate of change of the desired variable.

What are the common variables in a related rates shadow problem?

The common variables in a related rates shadow problem are usually the height of an object, the length of the shadow, and the distance between the object and the light source. Other variables may also be involved, depending on the specific problem.

What is the importance of related rates shadow problems in real life?

Related rates shadow problems have practical applications in various fields such as physics, engineering, and economics. They can be used to solve real-life problems involving rates of change, such as calculating the speed of an object or determining the optimal production rate for a company.

What are some tips for solving related rates shadow problems?

Some tips for solving related rates shadow problems include carefully reading and understanding the problem, identifying the given rates of change and variables, using diagrams and equations to represent the problem, and checking your answer for reasonableness. It is also important to practice frequently to improve your problem-solving skills.

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