What is the true wind velocity vw

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A sailboat moving in the direction shown is tacking to windward againts a north wind.The log resisters a hull speed of 6.5 knots.A "telltale"(light string tried to the rigging)indicates that the direction of the apparent wind is 35° from the centerline of the boat. What is the true wind velocity vw?

Reference no: EM132521676

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