How much energy in kWh is obtained by eating | vedclass

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Question

(A) Given energy $E = 700 \ kcal$.We know that $1 \ kcal = 10^3 \ cal$ and $1 \ cal = 4.2 \ J$.Therefore,$E = 700 	imes 10^3 	imes 4.2 \ J = 2940

Vedclass · Accepted Answer

$0.81$

Vedclass · Answer

(A) Given energy $E = 700 \ kcal$.We know that $1 \ kcal = 10^3 \ cal$ and $1 \ cal = 4.2 \ J$.Therefore,$E = 700 	imes 10^3 	imes 4.2 \ J = 2940 	imes 10^3 \ J = 2.94 	imes 10^6 \ J$.We know that $1 \ kWh = 3.6 	imes 10^6 \ J$.To convert energy from Joules to $kWh$,we divide by $3.6 	imes 10^6$.$E (in \ kWh) = \frac{2.94 	imes 10^6 \ J}{3.6 	imes 10^6 \ J/kWh} = \frac{2.94}{3.6} \approx 0.816 \ kWh$.Rounding to two decimal places,we get $0.81 \ kWh$.

How much energy in $kWh$ is obtained by eating an ice cream labeled as $700 \ kcal$?

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