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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 1 > Chapter 20 - Heat and Calorimetry > A lead bullet penetrates into a solid object and melts. Assuming that 50% of its kinetic energy was used to heat it, calculate the initial speed of the bullet. The initial temperature of the bullet is 27^∘ C and its melting point is 327^∘ C . Latent heat of fusion of lead = 2.5 × 10^4 J/k g and specific heat capacity of lead = 125 J/kg- K .

A lead bullet penetrates into a solid object and melts. Assuming that 50% of its kinetic energy was used to heat it, calculate the initial speed of the bullet. The initial temperature of the bullet is 27^∘ C and its melting point is 327^∘ C . Latent heat of fusion of lead = 2.5 × 10^4 J/k g and specific heat capacity of lead = 125 J/kg- K .

A 50 Kg man is running at a speed of 18 Km H−1. If all the kinetic energy of the man can be used to increase the temperature of water from 20°C to 30°C A lead bullet penetrates into a solid object and melts. Assuming that 50% of its kinetic energy was used to heat it how much water can be heated with this energy?