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CBSE Class 11-science Answered

a boatman can row with a speed of 10 km/h in still water.if the river flows steadily at 5 km/h in
Asked by | 26 Jul, 2009, 12:55: AM
Expert Answer

Assume that the boatman has to go in a direction making an angle θ with the line joining starting and finishing points, i.e. OA as shown in the figure.

 

The resultant velocity should be along OA. Riverflow is in the direction shown i.e.  from left to right.

From the triangle shown, sin θ = (5 km/hr) / (10 km/hr) = 0.5.

Hence the direction, i.e. angle θ = 30 deg.

Regards
Team
TopperLearning

Answered by | 01 Aug, 2009, 03:19: PM
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