When a cake is removed from an oven, it has a temperature of 150 ° C and three minutes later reaches 94 ° C. How long will the cake take to cool down so that it can be eaten by guests at 25 ° C, if room temperature is it 21 ° C?

Q: A hot pie that was cooked at a constant temperature of 325° F is taken directly from an oven and…

A:

Q: A jet is flying through air at a speed of 1250 km/h. Calculate Q5. Mach Number: the Mach number of…

A: Given,V=1250 km/hrT=-40°C=233 Ktaking molecular weight of air, m=29 g/mol

Q: 1- A substance has a mass M= 500 kg and a volume V=0.415 m'. Find : A-Weight W B-Density (r) C-…

A: 1. Given, Mass M = 500 kg Volume V = 0.415 m3  Acceleration due to gravity g = 9.8 m/s2

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: How many joules of energy are absorbed when 250. g Pb (specific heat = 0.0305 J/g°C) is heated from…

A: The given data is shown below:

Q: 9. A tank initially contains 200 litres of fresh water. Brine containing 2.5 N/litre of dissolved…

A:

Q: Q4- Determine the following properties for the gas given below at 542O psig and 257°F. - value of…

A:

Q: A room has a width of 14.1 feet, a length of 14.8 feet, and a ceiling height of 14 ft.  The average…

A: Width B =14.1 ft length L =14.8 ft Height H =14ft Flow rate=3.7m3 /s

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.