An electric locomotive of mass starts from rest on a straight horizontal track
PHYSICS · Subjective · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
An electric locomotive of mass 2.0×105kg starts from rest on a straight horizontal track. The traction motors draw electrical power at the rate of 1.5MW. Twenty per cent of this electrical input is lost as heat; the remainder appears as useful mechanical power accelerating the train.
(a) Convert the useful mechanical power into horsepower (1hp=746W).
(b) Assuming the useful power remains constant, calculate the speed attained by the train after 60s.
(c) Compute the numerical value of the train's kinetic energy at that instant.