A hot pie that was cooked at a constant temperature of 325° F is taken directly from an oven and placed outdoors in the shade to cool on a day when the air temperature in the shade is 85° F. After 5 minutes in the shade, the temperature of the pie had been reduced to 250° F. Determine the temperature of the pie after 20 min. 121.3°F 256.36°F 138.6°F O100.23°F

Q: Problem 8 Water enters the tubes of a cold plate at 65°C with an average velocity of 50 ft/min and…

A:

Q: The air coming out of the distillery has 60% relative humidity. How much water will you need to…

A: Consider the given data The air coming out of the distillery has 60% relative humidity 0.69g/kg…

Q: Assume an inside room temperature of 70°F and an attic air temperature of 15°F, with an exposed area…

A: Given- Tin=70°FT∘=15°FExposed Area=885 ft2Resisitance of inside attic film R1=…

Q: *1-8. The bottle tank has a volume of 1.12 m³ and contains oxygen at an absolute pressure of 12 MPa…

A:

Q: (9) [Text - Problem 2.48] 2-48 A sample of air contains 8.583 mol m3 of oxygen and 15.93 mol m-3 of…

A:

Q: Esumate the vapor pressure, all pressure, relative humidity, and all density at a height of 1800 in…

A: The height of the atmosphere = 1500 mThe total pressure = 100 kPaThe air temperature = 28°CThe dew…

Q: A water initially contains 140 L of water. Now equal rates of cold and hot water enter the tank for…

A: This problem is related to Discharge topic of Fluids Mechanics. In this question given about Warm…

Q: Water initially contains 140 L of water. Now equal rates of cold and hot water enter the tank for a…

A: To find rate of hot water

Q: 1-34 A 4-kW resistance heater in a water heater runs for 2 hours to raise the water temperature to…

A: E = 4 KW x 2 hrs E = 8 kWh

Q: 2-66 Determine the speed of sound in air at (a) 300 K an (b) 800 K. Also determine the Mach number…

A: Using relation C=kRTk=1.4 R=0.287×103 JkgK

Q: Estimate the vapor pressure, air pressure, relative humidity, and air density at a height of 1800 m…

A: The height into the atmosphere = 1500 mThe total pressure = 101 kPaThe air temperature = 25°CThe dew…

Temperature Difference and Heat Transfer

Whenever there is a flow of heat flux resulting from a temperature gradient within the material or between two materials, there is heat transfer. Heat transfer primarily arises due to temperature differences between two bodies or within bodies. The term temperature gradient denotes temperature differences or variation of temperature due to change in some quantity. The fundamental use of the concept of temperature is found in the zeroth law of thermodynamics.