A gun fires a lead bullet of temperature 300 K into a wooden block. The bullet having melting temperature of 600 K penetrates into the block and melts down. If the total heat required for the process…

Question

A gun fires a lead bullet of temperature 300 K into a wooden block. The bullet having
melting temperature of 600 K penetrates into the block and melts down. If the total heat required for the process is 625 J, then the mass of the bullet is grams. (Latent heat of fusion of lead

= 2.5 \times 10^{4} JKg^{- 1}

and specific heat capacity of lead

= 125 JKg^{- 1} K^{- 1}

)

Accepted Answer

Correct answer: A. (a) 625= ms T+ mL 625=m(125 300+2.5 10^4) 625=m [37500+25000 ] 625=m [62500 ] m= 1100 kgM=10 grams

Solution

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