An electronic device dissipating 25 W has a mass of 20 g and a specific heat of 850 J/kg·oC. The device is lightly used, and it is on for 5 min and then off for several hours, during which it cools to the ambient temperature of 25oC. Determine the highest possible temperature of the device at the end of the 5-min operating period. What would your answer be if the device were attached to a 0.5-kg aluminum heat sink? Assume the device and the heat sink to be nearly isothermal.