1.2 kg of liquid water initially at 15 c is to be heated to 95 C in a teapot equipped with a 1200-W electric heating element inside. the teapot is 0.5 kg and has an average specific heat of 0.7. taking the specific heat of water to be 4.18 and disregarding any heat loss from the teapot, determine how long it will take for the water to be heated.
thermal diffusivity
constant