What is the thermal cooling time constant (Tau) for an engine in a car if the car cools down from 115 degrees C to 35 degrees C in 2 hours. Give the answer in hours for that time constant. The temperatures given are actual temperatures as measured by a digital thermometer and you can assume that outside temperature is a constant 25 degrees C.
- 1.73 hours
- 1.13 hours
- 1.49 hours
- 0.91 hours
- 1.58 hours