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(13) A swimmer at point A on one side of river wants toreach at a point B on the other side by swimming only.Line AB makes angle 30° with the river flow. Velocityof swimmer is equal to velocity of river flow in magni-tude. In what direction o with the line AB should hetry to swim to reach at B.1 |
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Answer» Answer: theta= 30 degrees Explanation: tan alpha= A sin theta / B + A sin theta Now, tan 30 = Vsr sin theta/ VR + Vsr cos theta 1/root(3) = Vsr sin theta/ Vsr+ Vsr cos theta ( Vsr= Vr) 1/root 3 = sin theta/ 1+ cos theta Tan theta/2 = tan 30 Theta = 60 degree BETA= 60-30 = 30 |
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