An ice cream has a marked value of 700 kcal. How many kilowatt hour of energy will it deliver to the body as it is digested

0.81 kWh

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0.90 kWh

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1.11 kWh

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0.71 kWh

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Solution

The correct option is A
0.81 kWh

$1 c a l = 4.2 J$
$700 k c a l = 700 \times 10^{3} \times 4.2 J = \frac{700 \times 10^{3} \times 4.2}{3.6 \times 10^{6}} = 0.82 k W h [A s 3.6 \times 10^{6} J = 1 k W h]$

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An ice cream has a marked value of 700 kcal. How many kilowatt hour of energy will it deliver to the body as it is digested

The correct option is A 0.81 kWh 1cal=4.2J 700 kcal=700×103×4.2J=700×103×4.23.6×106=0.82 kWh [As 3.6×106J=1 kWh]

The correct option is A
0.81 kWh

$1 c a l = 4.2 J$
$700 k c a l = 700 \times 10^{3} \times 4.2 J = \frac{700 \times 10^{3} \times 4.2}{3.6 \times 10^{6}} = 0.82 k W h [A s 3.6 \times 10^{6} J = 1 k W h]$