Physics

Problem

An immersion rod rated 1000 W is used to heat 2 kg of water from

25^{\circ}\text{C}

75^{\circ}\text{C}

. Taking the specific heat capacity of water as

4200\,\text{J kg}^{-1}\,^{\circ}\text{C}^{-1}

and neglecting heat losses, the time taken for the heating is closest to a)

10.5\text{ min}

14.0\text{ min}

7.0\text{ min}

4.2\text{ min}