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Grade 11General Physics

Question: In order to protect himself from the rain, a person is standing holding an umbrella at right angle to the horizontal surface. The rain is falling at 10m/s when the velocity of the wind is zero. Suddenly, wind begins to blow at a speed of 20m/s, towards 30 degrees south of west. Now by what angle does the person have to turn his umbrella in order to protect himself from the rain?

priti

9 Years agoGrade 11

1 Answer

Vikas TU

9 Years ago

Speed of Rain(Vr) = 10 m/sec

Speed of Wind(Vw) = 20m/sec

The individual need to hand his umbrella over the resultant of the speed of rain and twist with a specific end goal to shield himself from the rain.

At that point Angle = Velocity of Rain(Vr)/Velocity of Wind(Vw)

= ½

= tan-1(1/2)

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