According to newton’s law of cooling, the rate at which a substance cools in air is directly proportional to the difference between the temperatures of the substance and that of air. if the temperature of the air is 30°f and the substance cools from 100° to 70°f in 15 minutes, how long will it take to cool 80°f to 35°f?

Thermodynamics T-11 All air is removed (vacuumed) from a 2 liter closed container that contains 200 ml of Liquid A and 600 ml of Liquid B at a temperature of 20C. At this temperature Liquid A has a density of 0.825 g/ml and vapor pressure of 25 kPa. Liquid B has a density of 0.750 g/ml and vapor pressure of 15 kPa. What is the mol fraction of vapor from Liquid A in the head space above the liquid surface? A) .25 B) .38 C) .63 D) .75

In a turbine 1,308 kW is produced by expanding an exhaust gas entering at 2.2 MPa and 662 K to a final pressure of 154 kPa. The inlet area of the turbine is The inlet area of the device is 0.2 m2 and the gas velocity at inlet is 25 m/s and at outlet is 51 m/s. Determine the specific volume at outlet in m3/kg to 2 decimal places.  Assume the gas constant to be 0.26 (kPa m3)/(kg K) and constant specific heats cp=1.01 kJ/(kg K) and cv=0.75 kJ/(kg K).

A cold drink initially at 40°F warms up to 44°F in 3 min while sitting in a room of temperature 70°F. How warm will the drink be if left out for 30 min? If the drink is left out for 30 min, it will be about (Round to the nearest tenth as needed.) °F.