Rain is falling vertically at 8.0 ms- relative to the ground. The rain drops make tracks on the
side window of a car at an angle of 30° below the horizontal. Calculate the speed of the car.
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Answer:
18° from vertical or
72
∘
from horizontally.
Explanation:
enter image source here
Air is moving horizontally with 40 km/h speed
Horizontal velocity vector of Air is shown in figure.
Velocity Vector of Raindrops is vertically downward .
Let resulting Velocity of Raindrops makes angle
θ
from the
vertical.
Then angle
tan
θ
=
v
Horizontal
v
vericle
=
40
120
=
1
3
θ
=
tan
−
1
(
1
3
)
≈
18
∘
Hence Raindrops makes angle
18
∘
from the vertical or make angle
72
∘
from Horizontal.
Explanation:
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