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 A piece of lead falls from a height of 100m on a fixed non-conducting slab which brings it to rest. If the specific heat of lead is 30.6 cal/kg °C, the increase in temperature of the slab immediately after collision

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a
6.72°C
b
7.62°C
c
5.62°C
d
8.72°C

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detailed solution

Correct option is B

h=100m; s=30.6cal/kg0C mgh =J.mθΔθ=ghJs=9.8×1004.2×30.6=980128.52 =7.625C

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