Question

How much energy is needed to increase the temperature of a kg of water 5 degrees c.

Answer 1

The given mass of water is,

`m=1\text{ kg}`

The value of the raise in the temperature is,

`\Delta T=5^cC`

The value of the specific heat of the water is,

`c=4200\text{ }Jkg^(-1)C^(-1)`

Thus, the energy needed to increase the temperature of water is,

`\begin{gathered} Q=mc\Delta T \\ Q=1*4200*5 \\ Q=21000\text{ J} \\ Q=21*10^3\text{ J} \\ Q=21\text{ kJ} \end{gathered}`

Hence, the amount of energy required to raise the temperature of the water to 5 degree C is 21 kJ.