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A certain amount of heat is added to a mass of aluminum (specific heat s = 0.21 cal/g°C) and its temperature is raised by 57°C. If (suppose that) the same amount of heat is added to the equal mass of copper (s=0.093 cal/g °C). The temperature rise in copper is

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157°C

129°C

29°C

57°C

answer is B.

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Detailed Solution

$Q = m s ∆ t;$

$m \times 0.21 \times 57 = m \times 0.093 \times ∆ t$

$∆ t = \frac{0.21 \times 57}{0.093} = 128 . 7^{o} C$

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