Physics

Problem

Water of volume 2 litre in a container is heated with a coil of 1 kW at

27^\circ\text{C}

. The lid of the container is open and energy dissipates at rate of 160 J/s. In how much time temperature will rise from

27^\circ\text{C}

77^\circ\text{C}

[Given specific heat of water is

4.2\ \text{kJ/kg}

] a. 7 min b. 6 min 2 s c. 8 min 20 s d. 14 min