MediumPhysicsfluid
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-- 4. A car is moving eastward with a speed of 54 km/h, while wind is blowing northwards with a speed of 36 km/h. A flag on the car will flutter in the direction:
A
tan⁻¹(2/3) West of South
B
tan⁻¹(2/3) North of East
C
tan⁻¹(2/3) North of West
D
tan⁻¹(2/3) East of North
Explanation
V_car = 15î (E). V_wind = 10ĵ (N). Velocity of wind relative to car V_WC = V_W - V_C = -15î + 10ĵ. This vector is in North-West direction. Flag flutters opposite to car motion relative to wind. Resultant direction is West of South or similar depending on frame.
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