It is important for the body to be able to cool itself even during moderate exercise. Suppose a 70kg man runs on a treadmill for 30min and at a (total) metabolic energy expenditure rate of 1000W. Remembering that the human body has a 25% efficiency, estimate the amount of (mechanical) work done on the treadmill during that time. A) 450kJ B)1350kJ C)1000kJ D)1800kJ

Q: Four pounds of air gain 0.491 BTU/R of entropy during a nonflow isothermal process. If P1=120 psia…

A: Given: P1 = 120 psia V2 = 42.5 ft3   To determine change in internal energy due non flow isothermal…

Q: In an isothermal process, 3700 J of work is done by an idealgas. Is this enough information to tell…

A: Work done by an ideal gas in an isothermal process is 3700 J

Q: By how much must one lower the temperature of a 65 – g of aluminum to change its internal energy by…

A:

Q: Calculate the net work output (in J) of a heat engine following path ABCDA in the figure, where V1 =…

A: Write the given values from the diagram.

Q: 3. Air flows steadily at the rate of 0.5 kg/s through an air compressor, entering at 7m/s speed, 100…

A:

Q: On a winter day, a certain house loses 1.12 x 108 J of heat to the outside. What is the total change…

A:

Q: Does a heat engine that has a thermal efficiency of 100 percent necessarily violate (a) the first…

A:

Q: A person's basal metabolic rate (BMR) is the rate at which energy is expended while resting in a…

A:

Q: A Carnot engine operates between 100°C and 20°C. How much ice can the engine melt from its exhaust…

A:

Q: Carnot refrigerator extracts heat from a freezer at -5.00°C and exhausts it at 25°C. How much work…

A: Given T1 = 25 0 C = 25+273 = 298 K T2 = 273 -5 = 268 K Heat extracted Q2 = 1 J

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 does 2.00 x 10° ) of work while 6.20 x 10 ) of heat transfer occurs to the environment.…

A: Given : Work done by the system (W) = 2 x 108 J Heat transfer to the environment (Q) = -6.2 x 108 J…

Q: Air with an initially at P1= 940 KPa, T1= 900K and V1= 0.15 m3, expands in reversible adiabatic…

A:

Q: Please help me with all the parts in this problem, and double check your answers as other tutors got…

A: Part A The density of the water is 1000 kg/m3. The molar mass of water is 18.0 g/mol. The formula…

Q: A 2.00 L container of left-over soup at a temperature of 323 K is placed in a refrigerator. Assume…

A: The container's volume is V = 2 Lt = 2 x 10-3 m3 The temperature of the left-over soup is Th = 323 K…

Q: Suppose 150 Joules of work is done on a system and that 300 Joules of heat are delivered to the…

A: Given data: Work done on the system = 150 J Heat added to the system = 300 J Required: Change in…

Q: On a winter daya certain house 5.00 * 10 ^ 8 * J Jof heat to the outside (about 500,000 )What is the…

A:

Q: During running, you lost 4.0×104 J of heat, and your internal energy also decreased by 1.6×105 J.…

A: Change in Internal energy, ∆U=-1.6×105J Heat lost, Q=-4.0×104J

Q: What is the change in internal energy of a car if you put 12.0 gal of gasoline into its tank? The…

A:

Q: - 2. (Ch. 18 Exercise 37 in Wolfson) During vigorous bicycling, the human body typically releases…

A: Given that- The rate of release of stored energy from food is 500 W  the rate of producing…

Q: model steam engine of 1.00 kg mass pulls eight cars of 1.00 kg mass each. The cars start at rest and…

A: First law of thermodynamics assigns that the change in internal energy of a system is equal to the…

Q: Supposed that you eat Skyflakes Cracker having a food calorific value of 120kcal and 22% of this…

A: Given  Food calorific value CV=120kcal=120×4184=502080J Useful work W=502080×0.22=110457.6 J Mass…

Q: A heat engine absorbs 2500 J of heat at 250°C and expels 2000 J at a temperature of 50°C. The change…

A: Given, Q1 = 2500 J T1 = 250 C∘ = 250+273.15 = 523.15 K Q2 = 2000 J T2 = 50 C∘ = 50+273.15 = 323.15 K…

Q: Is the efficiency of a heat engine more in hilly areas than in the plains? Why?

A: Efficiency of heat engines depend on source and sink temperatures. η=1-TsinkTSourceFrom the above…

Q: Air with an initially at P1= 940 KPa, T1= 900K and V1= 0.15 m3, expands in reversible adiabatic…

A: Given: At the initial state  P1=940 kPa, T1=900 K, and V1=0.15 m3. The process is adiabatic. The…

Q: When one gallon of gasoline is burned in a car engine, 1.19 x 108 J of internal energy is released.…

A: given, When one gallon of gasoline is burned in a car engine, 1.19 x 108 J of internal energy is…

Q: If the gravitational potential energy of the water is equal to the increase in the internal energy…

A: Given data: Water drops from the height of, h=50 m. Specific heat of water is, c=4184 J/kg·K.

Q: 2) A compressor draws in 0.5 kgm/s of air with 7 m/s speed, 100 kPa pressure, and 0.95 m3/kgm: The…

A:

Q: The amount of heat transferred to a thermodynamic system is Q=0,5KJ.Find the work done by  the…

A: Given data: Heat transferred to the thermodynamic system is Q = 0.5 kJ = 500 J Change in the…

Q: It is important for the body to be able to cool itself even during moderate exercise. Suppose a 70kg…

A: Given: Man's mass, m=70 kg Time, t=30 min=30×60=1800 sec Power, P=1000 W

Q: A Carnot heat pump is used to heat and maintain a residential building at 22°C. An energy analysis…

A: Given : TH = 22°C = 22 + 273 = 295 K Q = 2500 kJ/h°C  TL = 4°C = 4 + 273 = 277 K

Q: A Carnot air conditioner takes energy from the thermal energy of a room at 70 F and transfers it as…

A: The temperature are given in Fahrenheit. Convert these temperatures into Kelvin.

Q: Does a gas do any work when it expands adiabatically? If so, what is the source of the energy needed…

A:

Q: the work done during

A: The expression for the work done during an adiabatic process. Adiabatic process:- The thermodynamic…

Q: Which is possible: converting (i) 100 J of work entirely into100 J of heat, (ii) 100 J of heat…

A: Work into energy

Q: Air flows steadily at the rate of 0.5 kg/s through an air compressor, entering at 7 m/s speed, 100…

A: Given: m˙=0.5kg/s, v1=7m/s, P1=100×103Pa, V1=0.95m3/kg, v2=5m/s, P2=700×103Pa, V2=0.19m3/kg,…

Q: Supposed that you eat Skyflakes Cracker having a food calorific value of 120kcal and 18% of this…

A:

Q: 32. A gasoline engine takes in 2500 J of the heat and delivers 500J of mechanical work per cycle.…

A: Please note : As per answering quidelines I can answer the first question(Q.32) only. Since this is…

Q: 14. Calculate the net work output of a heat engine following path ABCDA in the figure below. P (10°…

A:

Q: Initially there is a balloon that holds half of a mole of an ideal gas with a volume of 1.5 L at 273…

A: Given: The number of moles is n=0.5. The initial volume is V1=1.5 L The initial temperature is…

Q: A system undergoes an adiabatic process in which its internal energy increases by 20 J. Which of the…

A:

Q: In moving out of a dormitory at the end of the semester, a student does 1.82 x 104 J of work. In the…

A: Given Work done, W=1.82×104J Internal energy, ∆U=4.07×104J

Q: When 1.60 x 105 J of heat transfer occurs into a meat pie initially at 20.0°C, Its entropy increases…

A: solution as