The initial kinetic energy of the ice bullet is converted into different forms of energy upon impact: a portion for penetration and the rest for heating the ice to its melting point (0°C) and then melting it at 0°C.
An ice bullet of temperature – 10°C is fired upon an object. The bullet spends 20% of its kinetic energy in penetrating into the object and remaining kinetic energy is spent into melting the bullet at 0°C. The latent heat of fusion of ice is 3·4 × 10⁵ J kg⁻¹ and its specific heat capacity is 2000 J kg⁻¹ K⁻¹. Which one among the following is the correct initial speed of the bullet ?
Asked in UPSC Geoscientist 2024 · Topic: Heat and Thermodynamics (Calorimetry and Phase Changes (Specific Heat, Latent Heat))
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