Physics

Problem

A locomotive of total mass

1.0\times10^{6}\,\text{kg}

increases its speed uniformly from

15\,\text{m\,s}^{-1}

25\,\text{m\,s}^{-1}

40\,\text{s}

. The engine converts only

30\%

of the chemical energy of the fuel into the mechanical energy that appears as the locomotive’s kinetic energy. Calculate the amount of chemical energy that must be supplied by the fuel during this

40\,\text{s}

interval. Express your answer in megajoules (MJ).

Browse the problem library