Using a timer (or watch) and a thermometer, conduct the following experiment to determine the rate of heat gain of your refrigerator. First make sure that the door of the refrigerator is not opened for at least a few hours so that steady operating conditions are established. Start the timer when the refrigerator stops running and measure the time Δt₁ it stays off before it kicks in. Then, measure the time Δt₂ it stays on. Noting that the heat removed during Δt₂ is equal to the heat gain of the refrigerator during Δt₁ + Δt₂ and using the power consumed by the refrigerator when it is running, determine the average rate of heat gain for your refrigerator, in W. Take the COP (coefficient of performance) of your refrigerator to be 1.3 if it is not available.