Question

2000 J of energy is needed to heat 1 kg of paraffin through $1^{\circ }C$. So How much energy is needed to heat 10 kg of paraffin through $2^{\circ }C$ ?

• A. 4000 J
• B. 10,000 J
• C. 20,000 J
• D. 40,000 J

Answer 1

The correct option is D 40,000 J

$W=mc\theta$
$2000=\left(1000\right)c\left(1\right)$
$c=2$ $J/g^{o}C$

we get value of c

Hence for $10kg$ through $2^{o}C$,

$W=\left(10000\right)\left(2\right)\left(2\right)=40000J$