A immersion heater is placed in of water initially at

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

1.0\,\text{kW}

immersion heater is placed in

1.2\,\text{kg}

of water initially at

20^{\circ}\!\text{C}

. The heater operates continuously for

4.0\,\text{min}

. Assuming no energy losses and that the water remains liquid, what is the water’s final temperature? (The specific heat of water is

4.19\times10^{3}\,\text{J\,kg}^{-1}\,^{\circ}\!\text{C}^{-1}

.) (a)

58^{\circ}\!\text{C}

(b)

78^{\circ}\!\text{C}

(c)

68^{\circ}\!\text{C}

(d)

92^{\circ}\!\text{C}