The average person produces heat at the rate of about 120 W when at rest. At what rate must water evaporate from the body to get rid of all this energy? (This evaporation might occur when a person is sitting in the shade and surrounding temperatures are the same as skin temperature, eliminating heat transfer by other methods.)

Q: A 68 kg cyclist is pedaling down the road at 15 km/h, using a total metabolic power of 480 W. A…

A: The cyclist spends only about 25% of the total metabolic power (P) generated in his body to propel…

Q: 7. Consider a material with a mass of 1.3 kg and a specific heat capacity of 1.7 J/kg°C. Compute for…

A:

Q: A househusband is cooking beef stew for his family in a pan that is (a) uncovered, (b) covered with…

A: A pan with a heavy lid offers more pressure and higher cooking temperature.

Q: If a system has 4×102 kcal of work done to it and releases 5×102 kJ of heat into its surroundings,…

A:

Q: From what height should be dumped a body with mass of 3 kg, so that the amount of heat given off,…

A:

Q: What is the change in internal energy of a system that takes in 3.33 106 J of heat, and does 4.50…

A: According to the first law of thermodynamics,∆U=Q-W.......(1)Where,∆U is the change in internal…

Q: In an insulated container, you combine hot metal with ice. The ice starts at -20 degrees C. The…

A: Obtain the specific heat of ice. Obtain the specific heat of the water. Obtain the latent heat of…

Q: What is the change in internal energy of a system that takes in 4.48 x 106 J of heat, and does 4.50…

A:

Q: On a typical day, a 65-kg man sleeps for 8.0 h, does light chores for 3.0 h, walks slowly for 1.0 h,…

A:

Q: A system consists of 2.0 kg of water at 75°C. 25 J of work is done on the system by stirring with a…

A: According to first law of thermodynamics, the amount of heat given to the system is equal to the sum…

Q: A 100 kg steel support rod in a building has a length of 2.0 m at a temperature of 200C. The rod…

A:

Q: A 68 kg cyclist is pedaling down the road at 15 km/h, using a total metabolic power of 480 W. A…

A: The total chemical energy (C.E) (metabolic power) can be converted into thermal energy (Th.E) and…

Q: How do heat transfer and internal energy differ? In particular, which can be stored as such in a…

A: The most basic difference between heat transfer Q and internal energy U: It can be easily understood…

Q: A 68 kg cyclist is pedaling down the road at 15 km/h, using a total metabolic power of 480 W. A…

A: Given: The mass of the cyclist is m=68 kg. The speed of the cyclist is v=15 km/h. By applying…

Q: A 0.2-kg aluminum plate, initially at 20°C, slides down a 15-m-long surface, inclined at a 30 degree…

A: Given Information: The mass of the aluminum (m) = 0.2 kg The initial temperature of the aluminium…

Q: a mental patient keeps pushing against the wall for a long time. does this generate heat? 1. only…

A: ANS.  1 and 3

Q: A body has traveled a distance of 6m in 3s and its kinetic energy is twice the velocity plus 2 and…

A:

Q: Can the temperature of a system not increase, even if the system an amount of heat Q? absorbs an (A)…

A: To explain : can the temperature of a system not increase , even if the system absorbs an amount of…

Q: An arrow in a bow in a bow has 270 (J) of potential energy. Assuming 100 (J) of energy were…

A:

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: When amount of heat Q is added to a system, and no work is done on it or done by it, its internal…

A: According to the first law of thermodynamic the expression for internal energy is ∆U=Q-WAs the work…

Q: Which of the following statements about heat transfer is NOT true? O The rate at which heat is…

A:

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

A: The heat transfer in this case is

Q: A hammer head of mass1.5 kg strikes an iron nail of mass 15 g that has a specific heat 450 J/kg. C◦.…

A:

Q: Suppose that the breakfast of a typical 65 kg adult gives him 1.85 x 105 J of energy. How long does…

A: Given: The mass of the adult m = 65 kg The energy had in breakfast E = 1.85 x 105 J The acceleration…

Q: A system consists of 3.0 kg of water at 80°C. 30 J of work is done on the system by stirring with a…

A:

Q: A heat of transformation of a substance is: O the same as the specific heat O the same as the heat…

A: The amount of heat associated with the transformation of a unit mass of the material is called the…

Q: Consider the change in the internal energy of a system. -What is the change in the internal energy,…

A: Given data: Work done by the system (W) = 4.725×105 J Heat added (Qin) = 3.2×106 J Heat rejected…

Q: -What is the change in internal energy of a system which does 3.5 x 10^5 J of work while 3.00×10^6 J…

A: Given data The work done by the system is W = 3.5 x 105 J. The heat transferred to the system is…

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: 15.3.1. An insulated container is filled with a mixture of water and ice at zero °C. An electric…

A:

Q: A 60 kg runner expends 3.00 x 102 W of power while running a marathon. Assuming 10.0% of the energy…

A: Given : Mass of the runner, m = 60 kg Power expended, P = 3×102 W = 300 W 10% energy delivered to…

Q: What is the change in internal energy of a system that takes in 4.53 x 106 ) of heat, and does 4.50…

A: The amount of heat transfer by a system can be given as, Q=Qin-Qout=4.53×106 J-8.67×106 J=-4.14×106…

Q: A copper wheel rubs against a copper plate in such a manner that there is a 47.0 N force of kinetic…

A: (a) given that forceof Kinetic friction;Fk=47 Nrelative spped netween the surfaces; V=41 m/srate at…

Q: Consider a surface at -5ºC in an environment at 25ºC. The maximum rate of heat that can be emitted…

A:

Q: A runner generates 1260 W of thermal energy. If this heat has to be removed only by evaporation, how…

A: Given, time=15min=15x60=900s Thermal Energy = 1260W= 1260 J/s So, total energy produced in 15 min=…

Q: What is the change in internal energy (in J) of a system that does 4.50 ✕ 105 J of work while 3.00 ✕…

A:

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…

A:

Q: The same heat transfer into identical masses of different substances produces different temperature…

A:

Q: Roughly how high could a 370 K copper ball lift itself if it could transform all of its thermal…

A: Equate thermal energy to mechanical work

Q: For objects of the same mass, what is most likely to happen if heat is removed? the one with higher…

A: The amount of heat required to raise the temperature of substance of mass 1 kg by unit degree C is…

Q: What is the change in internal energy (in J) of a system that does 4.50 ✕ 105 J of work while 3.40 ✕…

A:

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.