A circuit board houses on its surface 120 closely spaced logic chips, each dissipating 0.12 W. If the heat transfer from the back surface of the board is negligible, calculate (a) the amount of heat this circuit board (15 cm x 20 cm) dissipates during a 10-hour period, in kWh, and (b) the heat flux on the surface of the circuit board, in W/m2

Q: Explain the first law of thermodynamics? How is the first law different from the second law of…

A: It is required to explain first and second law of thermodynamics

Q: 1-17 A 15-cm-diameter aluminum ball is to be heated from 80°C to an average temperature of 200°C.…

A: Given data Diameter(d)=15cm=0.15m Radius(r) = 7.5cm=0.075m Initial temperature (Ti)=80 oC Final…

Q: The inner and outer surfaces of a 0.5-cm-thick 2-m x 2-m window glass in winter are 10°C and 3°C,…

A:

Q: Water with a temperature of 15 ° C approaches vertically to a cylinder with a surface temperature of…

A: Given- Ts=120∘CTW=15∘Cd=25mm=0.025mV=1m/sPr=5.16ν=0.76837×10-6m2/s

Q: A 25-kg iron ball with a temperature of 95°C is placed in a container with water whose mass is 40…

A: Given data, Mass of the iron ball, miron = 25 kg Initial temperature of the iron ball, Tiiron=95 °C…

Q: Hot air at 80°C is blown over a 2-m x 4-m flat surface at 30°C. If the average convection heat…

A: GivenTa=80oCTs=30oCA=2m×4mh=55 W/m2 Co

Q: Max likes to drink tea. He uses his kettle to heat 1.6 liters of water from 18°C to 100°C every day.…

A: Heat transfer: the transfer of heat from one body to another body due to the temperature differences…

Q: A child with a weight of 230 N swings on a playground swing attached to 2.10 m long chains. What is…

A: To find:The Potential energy:a) When the chains are horizontal.b) When the chains make an angle of…

Q: 1-16 A 15-cm x 20-cm circuit board houses on its surface 120 closely spaced logic chips, each…

A:

Q: yo to analysis syster onditioning system. Given that the refrigerant is R-134a. Tabl ollection on…

A:

Q: Assume the price of coal is 0.04 $/kp and that this coal has a heat of combustion of 28 MJ /kg. What…

A:

Q: Q2) Consider a 150-W incandescent lamp. The filament of the lamp is 5-cm long and has a diameter of…

A: The heat released by lamp is The length of the lamp is The diameter of filament is The diameter of…

Q: The drag force, Fa, imposed by the surrounding air on a vehicle moving with velocity Vis given by…

A: The given information in the problem is listed in the following attached image:

Q: TransPipe company is going to transport a flammable liquid. It is known that this liquid is being…

A: Giveninner diameter di=10mheta added Q=20kWspecific heat C=2.5kJ/kg Kdensity of the liquid…

Q: What happens to heat transfer per unit time in conduction heat transfer as thermal conductivity

A:

Q: A city has a fleet of 10 gasoline cars and 5 gasoline light trucks built in 2009. The annual vehicle…

A: Given data :-fleet of 10 gasoline cars and 5 gasoline light trucks built in 2009. The annual vehicle…

Q: Determine the energy transferred by conduction in 31 minutes, between the two faces of a concrete…

A:

Q: A 20lbm object is located 300 ft above the ground. What is the potential energy of the object in…

A: Potential energy is product of Mass, acceleration due to gravity and height. PE = 1944.986 cal (In…

Q: Hot air at 80°C is blown over a 2-m x 4-m flat surface at 30°C. If the average convection heat…

A: given data flat surface temperature  Ts=30° hot air temperature  Ta=80° Surface area A=(2x4)= 8m2…

Q: Consider the rate of heat conduction through a double-paned window that has a 1.4-m2 area and is…

A:

Q: The outside surface of a satellite with an emissivity of 0.90 receives a solar radiant flux of 1260…

A:

Q: Each line of the following table gives data, in Btu, for a process of a closed system. Determine the…

A:

Q: A 20lbm object is located 300 ft above the ground. What is the potential energy of the object in…

A:

Q: A window is replaced by a wall with thick insulation. The thermal conductivity of the same area will…

A: As per policy, one question can be answered. Hence, first question is answered.   Given, Thermal…

Q: SANAE IV, a research station of The South African National Antarctic Programme (SANAP), is located…

A: Given: The temperature of science lab, T2 = 307.8 K The heat supplied to lab, Q2 = 17360 J The work…

Q: store ice is made of wood 5.0 cm thick and has an effective area of 12,000 cm2 and thermal…

A: given x=5cm A=12000cm2 K=0.00027 cal/cm2-sec-°C/cm time t=24 hour  T out=25 oC T in=5 oC

Q: . Consider a person standing in a room at 25°C. Determine the total rate of heat transfer and the…

A:

Q: the expression for temperature distribution in the plate

A: Given; Uniform heat=80MWm3 having a thickness=20mm=0.2 mTleft=1600 CTright=1200 CK=200 W m-1k-1

Q: Determine the energy transferred by conduction in 31 minutes, between the two faces of a concrete…

A: Time, t=31 minutes = 31*60=1860 sec Wall Area, A=24.2 m2 Wall thickness, L=29.2 cm=0.292 m Inside…

Q: A windmill is attached to an electric generator that produces an average electric power of 5 kW. The…

A: Given Estored  =1.27 x 105 K J Ein=5 kW Qout=? t= 8h

Q: nit of thermal conductivity in S.I. units is (A) J/m² sec

A: Given: Thermal conductivity

Q: It is commonly recommended that hot foods be cooled first to room temperature by simply waiting a…

A:

Q: The BTU (British thermal unit) is still widely used to specify the heating ability of fuels. One BTU…

A: BTU (British thermal unit)  is the unit of Heat and 1 Btu is the amount of heat required to raise…

Q: An airplane has a mass of 190839 kg and carries 395 passengers having an average mass of 63 kg each.…

A: Given Data

Q: A cool box made of a material, having Thermal Conductivity of 0.22 W/m.°C has a total area of 3.9 m²…

A: Given Data Thermal conductivity of material is :k=0.22 W/m°C Total area is :A=3.9 m2 Initial…

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.