Question

Find time taken by a Electric Heater of 500W to raise temperature of 2Kg of water from 40 to 90 degree ( specific heat of water is 4.2 J/g c)​

Answer 1

Explanation:

difference in temperature =90-40=50

S = specific heat

pt=msΔT

500w×t=2×4.2×50

t=8.4 x 50/ 500

t= 420 / 500= 0.84sec