Properties Of Solids And Liquids Question 63

Question: A lead bullet of 10 g travelling at 300 m/s strikes against a block of wood and comes to rest. Assuming 50% of heat is absorbed by the bullet, the increase in its temperature is (Specific heat of lead = 150J/kg, K) [EAMCET 2001]

Options:

A) 100°C

B) 125°C

C) 150°C

D) 200°C

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Answer:

Correct Answer: C

Solution:

Since specific heat of lead is given in Joules,

hence use W=Q instead of W=JQ .

therefore 12×(12mv2)=m.c.Δθ

therefore Δθ=v24c=(300)24×150=150C .



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