question_answer

A train having 50 wagons of 25 ton each is moving with uniform velocity of 54 kmph. Find the horse power developed, if the average frictional force acting is 10 N per ton.

Answer:

Total mass of train \[=50\times 25=1250\,\,ton\] Total frictional force \[=1250\times 10=12500\,\,N\] Velocity \[=54\times \frac{5}{18}=15\,m{{s}^{-1}}\] \[Horse\,\,power=\frac{Frictinal\,\,force\,\,\,velocity}{746}=\] \[\frac{12500\times 15}{746}=251.3\,\,HP\]