1.

A train weighing 100 metric term is running ona level with a uniform speed of 72km/hr . If thefractional resistance amounts to 0.5kg weightper metric term,find the power of engine inwatt.

Answer»

Mass of the train is,

m = 105kg

Uniform speed of the train is, u = 72 km/h = 20 m/s

Frictional force per metric ton is = 0.5 × 9.8 N = 4.9 N

Therefore, frictional force on the train = 4.9 × 100 = 490 N

Since, the train has to overcome this frictional force to maintain a constant speed, the power is given by,

Power = (force)(speed) = 490 × 20 = 9800 W



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