Properties Of Solids And Liquids Question 78

Question: A hammer of mass 1kg having speed of 50 m/s, hit a iron nail of mass 200 gm. If specific heat of iron is 0.105 cal/gm°C and half the energy is converted into heat, the raise in temperature of nail is [RPMT 1995]

Options:

A) 7.1°C

B) 9.2°C

C) 10.5°C

D) 12.1°C

Show Answer

Answer:

Correct Answer: A

Solution:

W=JQ

therefore 12(12Mv2)=J(m.c.Δθ)

therefore 14×1×(50)2=4.2[200×0.105×Δθ]

therefore Δθ=7.1C



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