Joule, uses 3 (thermo-04) How many [translation unavailable] heat are produced, where: a 1000 kg heavy car from the 95 km/h fully braking is? How much kg water could one of 10℃ on 60℃ with the amount of energy the previously exercise heating? A drop of water falls out of a cloud.

  Exercise: thermo-04    

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1. How many [translation unavailable] heat are produced, where: a 1000 kg heavy car from the 95 km/h fully braking is?
2. How much kg water could one of 10℃ on 60℃ with the amount of energy the previously exercise heating?
3. A drop of water falls out of a cloud.

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Solution:

1. E_kin = ½ · m · v² = ½ · 1000kg · (26.38m/s) ^2 = 348'187 J
2. E_kin = Q = c_w · m · ΔT
       m = Q/(c_w·ΔT) = 348'187 J / (4182 J·kg^-1·K^-1 · 50 K) = 1.665 kg
3. E_pot = Q
       m·g·h = c_w · m · ΔT
       Masses shortening out, assuming h = 5000 m
       ΔT = g·h / c_w = 10m/s² · 5000 m / 4182J·kg^-1·K^-1 = 11.7℃

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