A lead bullet penetrates into a solid object and melts. Assuming that

1.	A lead bullet penetrates into a solid object and melts. Assuming that 40% of its kinetic energy is used to heat it, the initial speed of bullet is: (Given, initial temperature of the bullet = 127ºC, Melting point of the bullet = 327ºC, Latent heat of fusion of lead = 2.5 × 104 J Kg–1 , Specific heat capacity of lead = 125J/kg K)(A) 125 ms–1 (B) 500 ms–1 (C) 250 ms–1 (D) 600 ms–1
Answer» Correct option is (B) 500 ms^–1 m x 125 x 200 + m x 2.5 x 10⁴= 1/2 mv²x 40/100 V = 500 m/s

A lead bullet penetrates into a solid object and melts. Assuming that 40% of its kinetic energy is used to heat it, the initial speed of bullet is: (Given, initial temperature of the bullet = 127ºC, Melting point of the bullet = 327ºC, Latent heat of fusion of lead = 2.5 × 104 J Kg–1 , Specific heat capacity of lead = 125J/kg K)(A) 125 ms–1 (B) 500 ms–1 (C) 250 ms–1 (D) 600 ms–1

Answer»

Correct option is (B) 500 ms^–1

m x 125 x 200 + m x 2.5 x 10⁴= 1/2 mv²x 40/100

V = 500 m/s

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