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Heat and Thermodynamics question

2022 · 27 Jun · Shift 2 · Q53
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Heat and Thermodynamics question

2022 · 27 Jun · Shift 2 · Q53

JEE MainPhysicsHeat and ThermodynamicsMCQ+4 / −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 = 127 ∘^\circ∘ C, Melting point of the bullet = 327 ∘^\circ∘ C, Latent heat of fusion of lead = 2.5 ×\times× 104 J kg −-− 1, Specific heat capacity of lead = 125 J/kg K)
  1. A
    125 ms −-− 1
  2. B
    500 ms −-− 1
  3. C
    250 ms −-− 1
  4. D
    600 ms −-− 1
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