Consider a room that is initially at the outdoor temperature of 20°C. The room contains a 60-W lightbulb, a 110-W TV set, a 300-W refrigerator, and a 1200-W iron. Assuming no heat transfer through the walls, determine the rate of increase of the energy content of the room when all of these electric devices are on

Q: An insulated, constant-volume system containing 1.36 kg of air receives 53 kJ of paddle work. The…

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Q: A source at a temperature of 600K provides 2000kJ of heat. The temperature of environment is 250C.…

A: Maximum work is the reversible work, Temperature of the source= (T1)= 600 K Heat input = Q1= 2000 KJ…

Q: heat engine receives heat from a heat source at 1200°C and has a thermal efficency of 40 percent.…

A: For solution refer below images.

Q: For an energy storage capacity of 5 × 106 kWh, determine the minimum amount of water that needs to…

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Q: a piston cylinder arrangement has a gas in the cylinder space. during a constant pressure expansion…

A: Given data:-Work transfer = +1.6 kJHeat transfer =+3.2kJFriction energy change = -0.24 kJTo…

Q: house is to be maintained at 20°C when the outside air is at -25°C. It is determined that 1800 kJ is…

A: Given:Ti=20 CTo=-25 CQs=1800 KJ/minR=13 cents/KWh

Q: A wheel of mass 150 kg is released at the top of a hill. The wheel has a radius of 1.25 m and radius…

A: To find: The kinetic energy after the centre of mass of the wheel has descended a height h also find…

Q: The demand for electric power is usually much higher during the day than it is at night, and utility…

A: ρ = 1000 kg/m³ (density of water)g = 9.81 m/s² (acceleration due to gravity)Nighttime price =…

Q: A personal computer is to be examined from a thermodynamic perspective. Determine the direction of…

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Q: Consider a TV set that consumes 120 W of electric power when it is on and is kept on for an average…

A: Given: The average time per day TV is kept on is t=6 h The power consumes by the TV is P=120 W The…

Q: The demand for electric power is usually much higher during the day than it is at night, and utility…

A: ρ = 1000 kg/m³ (density of water)g = 9.81 m/s² (acceleration due to gravity)Nighttime price =…

Q: refrigerator maintains a food compartment at 2°C by r e required power input to the refrigerator is…

A: given:Q1=420kj/minWinput=2.5kw

Q: A heat pump is absorbing heat from the cold outdoors and supplying heat to a house. The house is…

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Q: gas inside a piston-cylinder arrangement is being compressed by a 50 kJ of work. If its internal…

A: Given:W=-50 KJU1=60 KJU2=100 KJ

Q: A 100W CPU with a size of 10x 10 cm is cooled at steady state with 25°C water that is pumped through…

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Q: A Carnot refrigerator consumes 2 kW of power while operating in a 20°C room. If the food compartment…

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Q: A 20-kW electric heater is used to heat up a house with size measured 6 m x 8 m x 10 m. The house is…

A: The mode of heat transfer in which molecules from a hot surface moves to a cold surface due to…

Q: Steam turbine is receiving a 1,831 lb/hr of steam, determine the kW output of the turbine if the…

A: Given: m˙=1831 lb/hr WT,out =1906 btu/lb

Q: Three hundred kilojoules of heat is added in a piston cylinder arrangement containing air causing it…

A: Polytropic heat addition and work done relation is used.

Q: Heat flows through a wall of a house at a steady-state on a day when the temperature of the outdoor…

A: GivenTo=2oC=2+273=275KTi=27oC=27+273=300K

Q: A room with dimensions of 3m*6m*8m is to be heated by a heater which supplies 30MJ of heat per hour.…

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Q: the minimum area of the solar collector

A: Given; A solar collector recieving solar radiation at the rate of;Q=0.6 KW/m2Overall efficiency of…

Q: A rigid tank contains hot fluid that is cooled while being stirred by a paddle wheel. The internal…

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Q: A refrigerator has a broken light bulb inside that is constantly turned on even when the…

A: Given:Power of light bulb, P=20 WCoP of refrigerator=1.4Electricity cost=12/ kWh

Q: The work done when a gas is compressed in a cylinder is 452 J. During this process, there is a heat…

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Q: A 10 hp fan is used in a room for circulation purposes. Assuming a sealed room. that is well…

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Q: Consider a refrigerator that consumes 400 W of electric power when it is running. If the…

A: The electricity cost of this refrigerator per month (30 days) is 69 rupees

Q: A refrigerator operating between -5°C and 27°C has the capacity of 80 tons. Determine the number of…

A: Write the given data in the problem.  m=10 kgT1=27°CT2=0°C Here, m is the mass of the refrigerator,…

Q: A car engine with a power output of 64 hp has a thermal efficiency of 24%. Determine the fuel…

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Q: The temperature of a gym is wanted to be kept at 297K. The environment is 312 K and the gym unit has…

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Q: 3. In a test to determine the bulk modulus of a liquid it was found that as the absolute press was…

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Forms of Energy

Energy is described as the capability to accomplish a task, like the ability to push a block by applying force on it. It is a quantitative property that is used to accomplish work on an object.