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Question

A car with vertical windshield moves in a rainstorm at a speed of 40km/hr. The rain drops fall vertically with a constant speed of 20m/s. The angle at which raindrops strike the windshield is:


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Solution

Step 1: Given

Speed of the car, vc=40km/hr=1009m/s

Speed of the raindrop, vr=20m/s

Step 2: Draw the free body diagram

Step 3: Determine the angle

The resultant angle is given by,

tanθ=vcvr=100920tanθ=59θ=tan-159

Therefore, the raindrop will strike the windshield at an angle of tan-159.


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