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Q.

A 2 g bullet moving with a velocity of 200 m/s is brought to. a sudden stoppage by an obstacle. The total heat produced goes to the bullet. If the specific heat of the bullet is 0.03 cal/g-oC, the rise in its temperature will be

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a

158.0∘C

b

15.80∘C

c

1.58∘C

d

0.1580∘C

answer is A.

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Detailed Solution

The kinetic energy of the bullet will be utilized to melt the bullet12mv2=(msΔθ)J12×2×10−3×(200)2=2×0.03×Δθ×4.2Δθ=158∘C

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