Asked by Tsunayoshi
A boat moves north at a uniform velocity of 15 mph relative to the shore from one side of the river to a point directly opposite on the other side of the river. The water in the river flows east at a constant speed of 5mph parallel to the shore. What is the velocity of the boat relative to the water?
Answers
Answered by
Tsunayoshi
Can you elaborate more?? I don't understand it..
Answered by
bobpursley
boatrelative/shore= waterrelativeshore+boarrelativewater
These are vectors
15N=5E+boatrelativewater
boatrelativewater= 15N-5E
Now we can use the right triangle.
first, the angle: The angle theta measured from directly across the river upstream, Theta= arcTan5/15
Now, the magnitude: v=sqrt(15^2+5^2)
These are vectors
15N=5E+boatrelativewater
boatrelativewater= 15N-5E
Now we can use the right triangle.
first, the angle: The angle theta measured from directly across the river upstream, Theta= arcTan5/15
Now, the magnitude: v=sqrt(15^2+5^2)
Answered by
Tsunayoshi
Thank you....
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