Consider a 1000-W iron whose base plate is made of 0.5-cm-thick aluminum alloy 2024-T6 (ρ = 2770 kg/m3 and cp = 875 J/kg·°C). The base plate has a surface area of 0.03 m2 . Initially, the iron is in thermal equilibrium with the ambient air at 22°C. Assuming 90 percent of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°C.

Q: A 14-ft tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is…

A: Given data as per the question The volume of tank= 14 ft3 =0.396436 m3 Initial pressure =14.7 psia…

Q: For a certain gas, R=0.277 kJ/kg-K and k=1.384.   What mass of this gas would occupy a volume of…

A:

Q: A mass of 1.37 kg of air in a piston-cylinder device is heated from 20.6°C to 250.1°C. During the…

A: Data given-  m = 1.37 kg  P = 111.04 kPa  T1 = 20.6 + 273.15 = 293.75 K T2 = 250.1 + 273.15 = 523.15…

Q: (b) A mass of 5 kg of saturated water vapor at 300 kPa is heated at constant pressure until the…

A: To find: The workdone by the steam during this process and sketch the process on P-v diagram with…

Q: A copper cylinder (c=390 J/kg K) with a mass of 75 g is placed in a furnace at a temperature of 312…

A: A copper cylinder   Ccu=390 J/kg K = 0.390 J/g K Mass of cylinder mcu= 75 g Temperature of furnace…

Q: An isolated piston-cylinder device contains 5 L of saturated liquid water at a constant pressure of…

A: Given: Work done, W = 400 kJ        Pressure, P = 170 kPa         Volume, V = 5 L          Current,I…

Q: A container holding 3.00 kg of water at 20.O°C is placed in a freezer that is kept at -20.O°C. The…

A: Please go through the solved solution below for total clearity and find your mistake.

Q: A Covid-19 patient whose weight is 65 kg has a body temperature of 38°C due to the ever caused by…

A:

Q: The water vapor is manually compressed in an unknown process until the volume of water vapor (Vw2)…

A: Given that, Mass of air, ma=0.4 kg,Pressure of air, Pa1=250 kPa,Temperature of air, Ta1=300 K,Mass…

Q: A guy shot a bird with a steel rod. When the bird and rod fell on the ground, the bird has been well…

A: Given data: Mass of the bird, mb = 0.51 kg specific heat of the bird, cp,b = 3.53 kJ/kg.K = 3530…

Q: Two Insulated cylinders A and B with volumes VA 1.2 m³ and VB 6.4 m³ contain chlorine gas at…

A:

Q: A 14-ft3 tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is…

A:

Q: A student living in a 3-m X 4-m X 4-m dormitory room turns on her 100-W fan before she leaves the…

A: Using the properties of air  R=287 J/Kg-K Cp=1.005 KJ/Kg-K Cv=0.717 kj/Kg-K Heat transfer, Q=100W…

Q: Methane has a isentropic expansion factor of 1.32. If methane undergoes a polytropic process wherein…

A:

Q: Determine the final temperature of 0.8kg of glass with heat capacity of C = 0.092 cal/g°k and…

A: Given data as per the question mass of glass= 0.8 kgheat capecity of glass=0.092 cal/g.k=385…

Q: A mass of ice at -7 C is needed to cool 224 kg of vegetables (Cp = 3.35 KJ /kg.K )in  a bunker for…

A:

Q: As shown in the figure below, a system consists of a copper tank whose mass is 23 kg, 4 kg of liquid…

A:

Q: In a rigid container, there is 3 kg of saturated liquid vapor mixed water. The temperature in the…

A: Given Data⇒ Mass of saturated liquid  (m1)=3 kg Final mass after escape(m2)=(3-1.2)kg m2=1.8 kg…

Q: Once upon a time, an engineering is conducting an experiment wherein he uses 10 moles of a gas. He…

A: Given data: n=10 molesP1=0.5 barT1=300 KT2=T∞=600 KCv=2.5RM=10 kgCV=1.5 kJ/kg⋅K

Q: In order to cool 1 ton of water at 20°C in an insulated tank, a person pours 140 kg of ice at –5°C…

A: Given: The mass of the water is mw= 1 ton= 1000 kg. The initial temperature of the water is T1,W=…

Q: Air is contained in a piston-cylinder arrangement with an initial volume of 0.02 m³ and at an…

A:

Q: A 166 g block of ice is cooled to -78°C and is then added to 500 g of water in an 80 g copper…

A: Write the values of specific heats of water, ice, and copper and the latent heat of fusion of ice…

Q: mass of ice at -4°C is needed to cool 115 kg of vegetables in a bunker for 24 hours. The initial…

A: Given                           Mass, m = 115 kg       Specific heat of water = 4.22 kJ/kg.K…

Q: A 0.2-m³ rigid tank is filled with saturated liquid water at 340°C. A valve at the bottom of the…

A: GivenV=0.2 m3T1=340oCmout=50% m1

Q: Steam at 100°C is used to warm 350 g of water contained in a 300 g aluminum container.  The initial…

A: The mass of the steam.Given:The mass of the water is .The mass of the aluminum is .The initial…

Q: A 36-m room is to be heated by three ton(1 ton =1000 kg) of liquid water contained in a tank that is…

A:

Q: Propane (MW = 44 ; k = 1.13) initially at 30 psia and 215°F, is stored inside a large spherical…

A: Write the given data: MW=44k=1.13P1=30 psiaT1=215 °F=215 +460.67 °R=675.67 °RT2=635 °F=635 +460.67…

Q: Stainless steel ball bearings (p = 8085 kg/m³ and cp = 0.480kJ/(kg °C)) having a diameter of 1.5 cm…

A:

Q: calorimeter is 0.28 kg and it contains 0.4 kg of water at 17°C. Taking the specific heat copper as…

A: I

Q: A piece of steel of mass 0.9 kg has a temperature of 95°C. It is immersed in a copper calorimeter…

A: Given data: Mass of steel  = 0.9 kg Initial temperature of steel = 95°C Specific heat capacity of…

Q: Plot DSa and DSw as functions of Tw on a single graph. Plot DSsys [DSsys = DSa +DSw] as functions of…

A: the graphs are in last two pages i solved whole question

Q: In an aluminum container weighing 0.30 kg are 0.70 kg of water in thermal equilibrium at a…

A: Given data: mAl=0.3 kgmw=0.7 kgQ=2.5K/minT=70°C Need to determine the flux leaking from the…

Q: In a fixed volume container with a volume of 0.1 m^3, initially there is saturated water vapor at…

A:

Q: (b) An airplane is flying at 1000 km/h through a still air having a pressure and temperature of 78.5…

A: Given data: V=1000 km/h=277.77 m/sP0=78.5 kN/m2T0=-8°C=265 KR=287 J/kg.Kγ=1.4 Need to determine the…

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.