Question

Take the mechanical equivalent of heat as 4 J/cal. A 10-gram bullet moving at 2000 m/s plunges into 1 kg of paraffin wax (specific heat 0.7 cal/g .°C). The wax was initially at 20°C. Assuming that all the bullet's energy heats the wax, its final temperature is:
A) 20.14 °C
B) 23.5 °C
C) 20.006 °C
D) 27.1 °C
E) 48.6°C

Answer

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