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A swimmer should swim making an angle theta with the upstream meaning |
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Answer» MATE❤✌Taking d to be the width of the river and also the the shortest DISTANCE covered by the swimmer. If the swimmer MAKES an angle θ with the UPSTREAM, then angle (90-θ) will be normal to the STREAM. Thus, shortest time taken will be the own distance i.e t=d/v.If speed of the river is v.Thus, making an angle (90-θ) will be COS(90-θ) and so speed will be vcos(90-θ). The shortest distance to cover the river in time will be t1 = d/vcos(90-θ) t1= d/vsin(θ).The ratio will be t/t1 =(d/v)/(d/vsin(θ)) = sinθ.✌❤PIYUSH_SHARMA❤✌ |
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