Question

a train having 60 wagons each weighing 25 ton is moving with a speed of 72 km per hour if the frictional force is 10 Newton per turn the power developed is

Answer 1

Please find below the solution to the asked query:

The force per tonne (frictional force)

F = 10 N

Total mass of the wagon  =  60 x 25 = 1500 tonnes

while the force of friction for 1500 tonnes will be 10 x 1500 = 15000 N

the velocity of the mass is 72 kmph which is 72 x (5/18) =20 m/s

hence the power developed by the engine is P = Force x velocity

P = 15000 x 20 = 300000 watts

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Answer 2

300000

answer is given in the attachment

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