Sat August 13, 2011 By:

Rain is falling vertically with speed 30 m/s.A girl rides her cycle with a speed of of 10m/s in N-S direction. In which direction she should hold his umbrella to protect herself?

Expert Reply
Sun August 14, 2011
Let vr be the velocity of rain and v be the velocity of the girl. To the girl, rain will apear to come from the direction of (vr - v ) which is given by
tan ? = v/vr = 10/30 = 1/3
i.e. she should hold the umbrella at an angle ? = tan-1 (1/3) soutth of vertical.
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