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Title: Topic is related rates Post by: Mathus on Aug 5, 2019 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. Title: Re: Topic is related rates Post by: bio_man on Aug 5, 2019 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. 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. Title: Re: Topic is related rates Post by: bio_man on Aug 5, 2019 Any thoughts on #2? I'm a little confused myself. Let me know what you think...
Title: Re: Topic is related rates Post by: Mathus on Aug 5, 2019 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 Title: Re: Topic is related rates Post by: bio_man on Aug 5, 2019 Click "reply" button, then you'll see "attachments ..." , upload there.
Title: Re: Topic is related rates Post by: Mathus on Aug 5, 2019 this is the diagram
Title: Re: Topic is related rates Post by: bio_man on Aug 5, 2019 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?" |