일반물리학 1 — Temperature, Heat, and the First Law of Thermodynamics: Problem 9

9 A small electric immersion heater is used to heat 170 g of water for a cup of instant coffee. The heater is labeled “180 watts” (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 23.0°C to 100°C, ignoring any heat losses.