A radar station sends a signal to a ship which is located a distance 13.8 kilometers from the station at bearing 136° clockwise from the north. At the same moment, a helicopter is at a horizontal range of 19.6 kilometers, at bearing 146° clockwise from the north, with an elevation of 2.56 kilometers. Let east be the î direction, north be the ĵ direction, and up be the direction.   (a) What is the displacement vector (in km) from the helicopter to the ship?    b) What is the distance (in km) between the helicopter and the ship?

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A radar station sends a signal to a ship which is located a distance 13.8 kilometers from the station at bearing 136° clockwise from the north. At the same moment, a helicopter is at a horizontal range of 19.6 kilometers, at bearing 146° clockwise from the north, with an elevation of 2.56 kilometers. Let east be the î direction, north be the ĵ direction, and up be the direction.
 
(a)
What is the displacement vector (in km) from the helicopter to the ship? 
 
b)
What is the distance (in km) between the helicopter and the ship?
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