Need solution

[sarahalvis@19]

A revolving beacon is situated 400 ft off straight shore. If the beacon turns at 360°/min, how fast does the beam sweep along the shore at a point 4800 ft from the nearest point?

 

[lev888]

A revolving beacon is situated 400 ft off straight shore. If the beacon turns at 360°/min, how fast does the beam sweep along the shore at a point 4800 ft from the nearest point?

What function described the motion of the beam? What do you need to do to answer the how fast question given this function?

 

[sarahalvis@19]

What function described the motion of the beam? What do you need to do to answer the how fast question given this function?

What do you mean?

 

[lev888]

What do you mean?

How does distance from nearest point depend on the angle? That's the function in question. Take the derivative - the result is the rate of change function. Evaluate it at 4800ft to get the answer.