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MMLU-Pro / 9620 / What must be the speed v of a lead bullet if it melts when striking a steel…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

What must be the speed v of a lead bullet if it melts when striking a steel slab? The initial temperature of the bullet is T_0 = 300° K, its melting point is T_1 = 700° K, its heat of melting q = 5 cal gr^-1, and its specific heat c = 0.03 cal gr^-1 K°^-1.

category

physics

options

  1. 420 m/sec
  2. 450 m/sec
  3. 500 m/sec
  4. 380 m/sec
  5. 400 m/sec
  6. 300 m/sec
  7. 350 m/sec
  8. 275 m/sec
  9. 320 m/sec
  10. 340 m/sec

src

stemez-Physics

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Source and history

Official source

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