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Question

A lead bullet of 10 g travelling with 300 m/s strikes against a block of wood and comes to rest. Assuming 60% of heat is absorbed by the bullet, the increase in its temperature is (Specific heat of Lead is 150 Jkg1k1):

A
100C
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B
12.50C
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C
1800C
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D
200C
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Solution

The correct option is C 1800C
Energy absorbed by the bullet=0.6× (Kinetic energy of the bullet)
mcΔT=0.6(0.5)mv2
ΔT=(0.6)(0.5)(3002)150=180oC

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