We often can see a long smoke trail hovering above a moving train. The
smoke that comes out from the engine immediately floats in the air above
(which means it is stationary relative to the air). The smoke takes some
time to dissolve and vanish. The time for the smoke to dissolve depends
on the nature of the smoke particles, temperature, humidity of the air,
etc. As the train moves and releases the smoke at different locations we
see a smoke trail extending from the engine to the point where the smoke
dissolves.
One day from a window, you see 2 identical trains A and B moving with
the same speed in opposite directions crossing each other. You notice
that A's smoke trail is four times as long as B's. And you also notice that
the wind is blowing exactly along the railway line. Find the ratio of the
Wind Speed: Train Speed.
Answers
Answer: 23 : 43 23 is the ratio of wind speed and 43 is the atio of train speed
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Answer:
The ratio of the wind speed: to train speed will be 1:2.
Explanation:
Due to the uniform pace of the two parallel trains, they are going at the same rate. The velocities, however, are 1:2 in ratio. As a result, the train going in the direction of the wind = (v + u) and the train moving against the wind = (v - u).
As a result, v = 3u
Or (v + u)/(v - u) = 2/1
The Tip Speed Ratio (TSR) is a crucial element in the design of wind turbines. TSR stands for the ratio of wind speed to the speed of the blade tips on wind turbines. The blades spin more quickly the farther they are from the center. The ideal tip speed ratio results in maximum power extraction. The non-constant tip speed ratio and the inherent inefficiencies and losses in various turbine designs are to blame for the uncaptured power.