An office worker claims that a cup of cold coffee on his table warmed up to 80°C by picking up energy from the surrounding air, which is at 25°C. Is there any truth to his claim? Does this process violate any thermo dynamic laws?

Q: A rectangular window that is 1.20m wide and 1.8m high has a thickness of 6.2 mm and thermal…

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Q: The human body, while at rest, produces heat energy at a rate of about 117 W. How much sweat (in g)…

A: The heat energy evaporated  per minute is,   Q=Qt˙=117 W1 minute60 s1 minute=7020 J

Q: A 50.0-g copper calorimeter contains 260 g of water at 20.0°C. How much steam at 100°C must be…

A: From calorimetric equation, the expression for the mass of the steam,

Q: Which has more heat: 1g of ice at 0 degree C or 1g of water at 0 degree C? Give reason.

A: Latent heat is the measure of the heat energy per mass released or absorbed during a phase change.

Q: Approximately how much heat must be removed from 0.5 kg of 50 °C water to freeze it into 0 °C ice?…

A: Mass of water= ½ Kg Initial temperature of water, Ti= 273+50 K Latent heat of fusion= 334000 J/Kg…

Q: A single pane of glass in an old home measures 1.14 m by 0.6 m and is 0.01 m thick. During a cold…

A: Given thermal conductivity of the wall k =1.7 W/mK.Given length and breadth of the wall as 1.14 m…

Q: How much ice at 0 degree Celsius must be poured into a 100 g of water at 80 degree Celsius, to…

A: Given: Mass of water mw=100 g, Temperature of water Tw=80°C, Temperature of ice Ti=0°C, Final…

Q: How much heat transfer (in kilocalories) is required to thaw a 0.433 kg package of frozen vegetables…

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Q: A laptop computer processor chip heats up to around 50ºC when working hard. What is this temperature…

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Q: The type of heat transfer that happens through direct contact of molecules or particles with each…

A: The type of heat transfer that happens through direct contact of molecules or particles with each…

Q: Should a modern kitchen be air-conditioned? Will this  create cold food(which is supposed to be…

A: Yes, a modern kitchen can be air-condtioned. If the kitchen is an open one then installing an air…

Q: To sterilize a 155 g glass water bottle, we must raise its temperature from 62.0ºC to 102ºC. How…

A: givenmass of glass water bottle m=155 g=0.155kgTermerature (T1)=62°CTemperature T2=102°C

Q: What three factors affect the heat transfer that is necessary to change an object’s temperature?

A: heat transfer

Q: How much water mass do you lose while running for 3.0 h? At body temperature the heat of…

A: Given data: Power (P) = 340 W Time (t) = 3.0 h Heat of vaporization = 2.4 × 106 J/kg Required: Mass…

Q: Why can’t you establish whether you are running a high temperature by touching your own forehead?

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Q: You apply a flame to 2 L of water for a certain time and its temperature rises by 1°C. If you apply…

A: We know,  Q = m*c*Δt Mass can further be represented in terms of volume as - Density = mass/volume.…

Q: At what rate is heat lost through a 1.7m x 1.4m rectangular glass windowpane that is 1.0cm thick…

A: Given Data: Area of the windowpane is A = 1.7 m x 1.4 m. Thickness of the windowpane is l = 1 cm.…

Q: A study showed the average basal metabolic rate of a human to be about 1500 kcal/day (6279 kJ/day).…

A: Given information; Here, Q is the heat released in 24 hours from the body due to the metabolism…

Q: 3 moles of an ideal polyatomic gas initially with a volume of 2 m3 and a temperature of 3000C is…

A: The work done by the gas compressed isothermally is, W=nRTlnVfVi=nRTln13ViVi

Q: When thermal energy is removed from a system, what happens to temperature and the average kinetic…

A: Temperature is a measure of average kinetic energy of the molecules of the system. As the…

Q: The human body, while at rest, produces heat energy at a rate of about 116 W. How much sweat (in g)…

A: Given data The heat energy is given as Q˙=116 W. The latent heat of vaporisation is given as Lv =…

Q: The type of heat transfer that occurs in liquids and gases, such as warm air rising and cold air…

A: Convection:  It is a mode of heat transfer which occurs by the motion of a fluid due to density…

Q: A 2.0-kg aluminum block is originally at 10 degree Celcius. If 36 k) of energy are added to the…

A: Given that, Mass of the aluminum block, m = 2 kg The initial temperature of the block,…

Q: One of temperature units is Degrees Fahrenheit o m/s O J/(kg-K)) O Joule O

A: m/s is the unit of velocity J/(kg.K) is the unit of specific heat capacity Joule is the unit of…

Q: The human body, while at rest, produces heat energy at a rate of about 100 W. How much sweat (in g)…

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Q: 20) At room temperature, a typical person loses energy to the surroundings at the rate of 62 W. If…

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Q: If 0.035 kg of ice at 0 ∘Cis added to 0.210 kg of water at 36 ∘ in a 0.100-kg aluminum calorimeter…

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Q: Aside from being transparent, why are laboratory apparatus such as graduated cylinder, beakers, and…

A: Laboratory apparatus such as graduated cylinder, beakers, and flasks made up of glass Borosilicate…

Q: A physics students wants to know how much ice can he put inside an insulated beaker containing 250g…

A: Heat flow due to temperature difference is Q = ms∆TWhere, S = specific heat

Q: A newspaper article about the weather states that “the temperature of an object measures how much…

A: Temperature is the measure of the the average kinetic energy of the molecules in a system and it is…

Q: The human body, while at rest, produces heat energy at a rate of about 103 W. How much sweat (in g)…

A: The expression for the amount of sweat is,

Q: Consider a frozen lake. If the air temperature above the surface is -16.3 °C, what is the heat flow…

A: Given data, Temperature T=-16.3 °C The conductivity of K=2.20 W/(m-K) distance d=43.1 cm

Q: During moderate activity, the body of a person weighing 70 kg creates 1.0 MJ energy per hour. About…

A: SOlution: Given that m = 70 kg E = 1 MJ 80% of that energy is converted into heat.

Q: To sterilize a 225 g steel water bottle, we must raise its temperature from 18.0ºC to 98.0ºC. How…

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Q: A bullet of mass 10 g moving with speed of 9ung y 210 m/s in stopped suddenly. If all its kinetic…

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Q: calculate the outside temperature

A: Given data:  The heat loss per unit area is: Q=10 W/m2 The thickness of the exterior wooden wall is:…

Q: The figure shows a cut-away drawing of a thermos bottle (also known as a Dewar flask), which is a…

A: The functions of the various parts are; Vacuum: It reduces the transfer of heat due to convection or…