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Mathus Mathus
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4 years ago
 Q1)a ship moving 30km/hr is 6km from a straight beach and is moving parallel to the beach. How fast is the ship approaching a light house on the beach when 10km (straight line distance) from it?

Q2) A rope runs over a bully at A and is attached at B. The rope is being wound in at a rate of 2m/s. How fast is B rising when AB is horizontal?

Q3) a lamp is located on the ground 10m from a building. A person 2m tall walks form the light towards the building at a rate of 2m/sec. Find the rate at which the persons shadow on the wall is shortening when the person is 5m from the building.
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wrote...
Valued Member
Educator
4 years ago
Q1)a ship moving 30km/hr is 6km from a straight beach and is moving parallel to the beach. How fast is the ship approaching a light house on the beach when 10km (straight line distance) from it?

Will be back in 2 hours to answer 2 and 3.

The answer to 1 is attached.
Post Merge: 4 years ago

Q3) a lamp is located on the ground 10m from a building. A person 2m tall walks form the light towards the building at a rate of 2m/sec. Find the rate at which the persons shadow on the wall is shortening when the person is 5m from the building.
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Valued Member
Educator
4 years ago
Any thoughts on #2? I'm a little confused myself. Let me know what you think...
Mathus Author
wrote...
4 years ago
hello in question 2 there is a mistake
Q2) a rope runs over a pulley at A and is attached at B. The rope is being wound in at the rate of 2m/sec. How fast is B rising when AB is horizontal?

i have a diagram but how do i upload it
wrote...
Valued Member
Educator
4 years ago
Click "reply" button, then you'll see "attachments ..." , upload there.
Mathus Author
wrote...
4 years ago
this is the diagram
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wrote...
Valued Member
Educator
4 years ago
I can't seem to get this one no matter what I try. :-( If I think of a way, I'll update this thread.

By the way, what trips me up is the wording "How fast is B rising when AB is horizontal?"
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