Heat is supplied uniformly at the rate of 100W to 1.0 x 10-2kg of a...

JAMB 1984

Heat is supplied uniformly at the rate of 100W to 1.0 x 10^-2kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5^oC, then the specific heat capacity of the liquid is

A. 2.0 x 10²Jkg^-1k^-1
B. 2.0 x 10²Jkg^-1
C. 4.0 x 10⁴Jkg^-1k^-1
D. 4.0 x 10⁴kg^-1
E. 8.4 x 10³Jkg^-1k^-1

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Correct Answer: Option C

Explanation

Heat energy = Electrical energy

mc\(\theta\) = power x time

5 x 1 x 10^-2 x C = 100 x 20

C = 4.0 x 10⁴Jkg^-1k^-1

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Heat is supplied uniformly at the rate of 100W to 1.0 x 10-2kg of a...

Correct Answer: Option C

Explanation

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