You lift a large bag of flour from the floor to a 2.5m high counter, doing 400J of work in 2 seconds. How much force did you app
2 answers:
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<u>Answer:</u>
<em>The initial distance between the trains is 1450 m. </em>
<u>Explanation:</u>
In the question two trains are of equal length 400 m and moves at a uniform speed of 72 km/h. train A is moving ahead of train B. If the train B has to overtake train A it should accelerate.
Train B’s acceleration is and it accelerated for 50 seconds.
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<em>t=50 s </em>
<em>initial speed u=72km/h </em>
<em>we have to convert this speed into m/s </em>
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<em>Distance covered in accelerating phase </em>
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If a train is just behind another, the distance covered by the train located behind during overtaking phase will be equal to the sum of the lengths of the trains.
<em>Here length of train A+length of train </em>
<em>Hence the initial distance between the trains = </em>
Explanation:
It is given that,
Bandwidth of a laser source,
(b) Let t is the time separation of sections of sections of the light wave that can still interfere. The time period is given by :
(a) Let h is the coherence length of the source. It is given by :
c is the speed of light
l = 0.0099 m
Hence, this is the required solution.