quiz3 - Math 10C(Overholser Quiz 3 Oct 29 2010 Name TA...

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Math 10C (Overholser) Quiz 3 Oct. 29, 2010 Name: TA: Section # or Time: Instructions: You may use a calculator but must show all steps needed to derive your answer. Answers with no work shown will receive no credit. No simplification of solutions is required for full credit: you may leave expressions such as sin(4) or 1 2 as they are. 1. (5 points) A helicopter is flying at an airspeed of 400 km/hr. A cross wind is blowing from the southeast at 30 km/hr. What direction should the helicopter head to end up going directly south? You may find it helpful to recall that a unit vector at an angle of θ from the x-axis is given by cos θ ~ i + sin θ ~ j . You may give your answer in terms of either an angle or a unit vector pointed in the appropriate direction.

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