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Question

A glass wind screen whose inclination with the vertical can be changed is mounted on a car. The car moves horizontally with a speed of 2 m/s. At what angle α with the vertical should the screen be placed so that the rain drops falling downwards with velocity 6 m/s strike the windscreen perpendicularly?

A

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B

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C

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D

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Solution

The correct option is B. tan1(3).

Velocity of rain with respect to car vRC=vRvC should be perpendicular to the wind screen.

From the diagram above,

tan α=VRVC=62=3
α=tan1(3).


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