A 22000 kg subway train initially traveling at 10.0 m/s slows to a stop in a station and then stays there long enough for its brakes to cool. The station’s dimensions are 65.0 m long by 20.0 mwide by 12.0 m high.

Question

A 22000 kg subway train initially traveling at 10.0 m/s slows to a stop in a station and then stays there long enough for its brakes to cool. The station’s dimensions are 65.0 m long by 20.0 mwide by 12.0 m high.

 

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General Physics PRemastered 1 year 1 Answer 389 views 0

Answer ( 1 )

  1. Mass of train=22000kg

    Velocity=10m/s

    Kinetic energy of train=(1/2)*22000*10²=1100000 Joules

    Volume of air=65*20*12=15600 m³

    Density of air=1.2 kg/m³

    Mass of air=15600*1.2=18720 kg

    18720*1020*(change in temperature)=1100000

    Change in temperature=1100000/(18720*1020)=0.058 K

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