Why are car crashes more dangerous at higher speeds than at lower speeds
2 answers:
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Answer: 20.7 kJ
Explanation:
According to first law of thermodynamics:
=Change in internal energy
q = heat absorbed or released
w = work done or by the system
w = work done on the system= {Work is done on the system is positive as the final volume is lesser than initial volume}
w = 4.51 kcal = (1kcal = 4.184kJ)
q = +1.79 kJ {Heat absorbed by the system is positive}
Thus for a system that receives 1.79 kJ of heat from surroundings and has 4.51 kcal of work done on it at the same time is 20.7 kJ
9. (80-32)5/9
48×5/9
240/9
26.66°C
9. (90-32)5/9
58×5/9
32.22°C
10 (212-32)5/9
180×5/9
20×5
100°C
