A room is lighted by four 100 W incandescent lightbulbs. (The power of 100 W is the rate at which a bulb converts electrical energy to heat and the energy of visible light.) Assuming that 73% of the energy is converted to heat, how much heat does the room receive in 6.9 h?

Q: A hot copper rod is immersed in 500 kg of water for which the temperature increased  to 180F from…

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Q: Lake Erie contains roughly 4.50E+11 m3 of water. How much heat is required to raise the temperature…

A: Given(s): The mass of water: m=4.5×1011 m3 The initial temperature of the water, 11.5 oC The final…

Q: An electric heater supplies heat to a system at a rate of 100 W. If system performs work at a rate…

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Q: 1. 500J of work are done on a system in a process that decreases the system’s thermal energy by…

A: According to the first law of thermodynamics, ∆U=Q+WQ=∆U-W Here, ∆U is the change in the internal…

Q: An Aluminum cable has an initial length of (100 + 82) m at a summer temperature of 40 C. What would…

A: Given that, L=182mTf=-500CTi=400Cα=24×10-6 per0C

Q: A well-sealed room contains 60 kg of air at 200 kPa and 25°C. Now solar energy enters the room at an…

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Q: An infrared heater for a sauna has a surface area of 0.05 m and an emissivity of 0.83. What…

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Q: What is the ideal efficiency of an automobile engine in which fuel is heated to 2700 K and the…

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Q: An immersion heater of power J= 500 W is used to heat water in a bowl. After 2 minutes, the…

A: According to thermodynamics -  In first 2 minutes, heater gives heat to the water -  Q1=Jt1 Where  Q…

Q: The quantity of energy Q transferred by heat conduction through an insulating pad in time interval…

A: Given that the quantity of energy Q transferred by heat conduction through an insulating pad in time…

Q: An infrared heater for a sauna has a surface area of 0.050 m2 and an emissivity of 0.84. What…

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Q: The Earth intercepts 1.27 × 1017 W of radiant power from the Sun. Suppose the Earth, of volume 1.08…

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Q: An inventor develops a stationary cycling device by which an individual, while pedaling, can convert…

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Q: If a river having a flow rate of 942 cubic feet per second flows over a waterfall having a height of…

A: Given The flow rate of the river is Q = 942 ft3/s. The height of the waterfalls is h = 14 m. The…

Q: A 2 kW electric heater raises the temperature of 400 g of water from 15 °C to 353.15 K. How long…

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Q: If 850 J of energy is used to heat 50.0 g of water, what is the temperature change of the water?…

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Q: What is the change in the internal energy of a system when a total of 150.00 J is transferred by…

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Q: A bulb delivers 33 W of radiant energy when its filament is at 1900 °C. If the temperature increases…

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Q: To help keep his barn warm on cold days, a farmer stores 860 kg of solar-heated water (Lf = 3.35E+5…

A: Given Mass of the water m =860 kg  so the energy released by the water from cooling this to 11.8oC…

Q: A bullet (c = 128 J/kg °C) is moving at 300 m/s enters a block of ice and stops. By what will be the…

A: Given Speed v = 300 m/s Energy E = 90 J Specific heat = c = 128 J/kg o C

Q: If I add 37,483 J of energy to an ideal gas inside a balloon, causing the internal energy to…

A: Given data The heat added inside the balloon is given as ∆Q=37483 J. The increase in internal…

Q: A water heater transfers heat to an amount of water at a rate of 100 W. How long will it take to…

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Q: What is the change in internal energy of a system which does 4.50×105J of work while 3.00×106 J of…

A: The change in internal energy(ΔU) of a system.given,workdone(W)=4.50×105 J Heat goes…

Q: An object has an emissivity of 0.725. At temperature T, it radiates heat at a rate of 10.W. What is…

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Q: 25) In a flask, 114.0 g of water is heated using 67.0 W of power, with perfect efficiency. How long…

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Q: If the net work is 89 kJ and the efficiency is 61% how much heat is added in the system? O 145.98 kJ…

A: When we are transferring energy or doing some work then all of the work does not go into the system.…

Q: How many metres can a man weighing 60 kg climb by using the energy from a slice of bread which…

A: Given:  mass, m = 60 kg  Energy, E = 100000 calories efficiency = 28 %

Q: How much work must be done by this heat pump to supply 2550 J of heat on a day when the outside…

A: Given data : Heat supply to heat pump is, Q=2550 J. Outside temperature is, To=253 K.

Q: A 8.2 kg block of copper is dropped at 80 ° C into a container with 0.62 L of water at 10 ° C. How…

A: Given information: The mass of the copper block, mc=8.2 kg The temperature of the copper, tc=80 °C…

Q: Lake Erie contains roughly 4.50E+11 m3 of water. How much heat is required to raise the temperature…

A: Given , volume of water = 4.50E+11 m3  density of water = 1000 kg/m3 Difference in temperature of…

Q: 0.25 kg cup of water from 55C to 82 C. How much energy would this take? (the specific heat of water…

A: As per the given data mass(m) = 0.25 kg               = 0.25×103g               = 250 g

Q: How much energy would you consume daily if you kept 3 lightbulbs of 25 watts on all day long?.

A: Power consumed by 1 bulb, p=25W Total power consumed by 3 bulbs=P=3p=75W 1 day, t=86400Seconds. so…

Q: You are asked to design a heating system for a swimming pool that is 2 m deep, 25 m long, and 25 m…

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Q: A 3kW immersion heater is used to raise a 500g container of water from 20 degrees Celsius to 30…

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Q: During a process, the internal energy of a system increases by 16 Kj, at the same time it performs a…

A: According to the first law of thermodynamics,  dQ = dU + dW  where, dQ is the heat supplied, dU is…

Q: A thermodynamic system undergoes a process where its internal energy increases by 200 J. During this…

A: The change in internal energy of the system,

Q: When 500 grams of an unknown vapor condenses in to liquid, it releases enough energy to raise the…

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Q: The first law of thermodynamics relates the heat transfer into or out of a system to the change of…

A: The first law of thermodynamics can be written as, ΔU=Q-W Here, ΔU is the change in internal energy…

Q: What approximately is the power of the thermal radiation?

A: We can consider human body as nearly black body as it has the emissivity=e =0.98 The power or energy…

Q: In a certain solar house, energy from the Sun is stored in barrels filled with water. In a…

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Q: What is the change in internal energy of a system which does 6.5×105 J of work while 3.00×106 J of…

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Q: To help keep his barn warm on cold days, a farmer stores 837 kg of solar-heated water (Lf = 3.35E+5…

A: Heat energy required to cool the water and thereafter for complete freezing is,

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.