7. A 25,000 kg subway train initially traveling at 15.5 m/s slows to a stop in a station and then stays there long enou
brakes in stopping the train is transferred as heat uniformly to all the air in the station, by how much does the air t
1020 J/(kg C°).
2.123 C°
1.678 C°
3.007 C*
0.157 C

We know that energy is the capacity to do work and it can neither be created nor destroyed. The kinetic energy of the moving vehicle is converted to thermal energy.

Thus;

1/2mv^2 = mcdT

0.5 * 25,000 * (15.5)^2 = 25,000 * 1020 * dT

dT = 0.5 * 25,000 * (15.5)^2/25,000 * 1020

dT = 0.157 °C

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7. A 25,000 kg subway train initially traveling at 15.5 m/s slows to a stop in a station and then stays there long enou brakes in stopping the train is transferred as heat uniformly to all the air in the station, by how much does the air t 1020 J/(kg C°). 2.123 C° 1.678 C° 3.007 C* 0.157 C

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7. A 25,000 kg subway train initially traveling at 15.5 m/s slows to a stop in a station and then stays there long enou
brakes in stopping the train is transferred as heat uniformly to all the air in the station, by how much does the air t
1020 J/(kg C°).
2.123 C°
1.678 C°
3.007 C*
0.157 C