Suppose you spend 30.0 minutes on a stair- climbing machine, climbing at a rate of 90.0 steps per minute, with each step 8.00 inches high. If you weigh 150. lb and the machine reports that 600. kcal have been burned at the end of the workout, what efficiency is the machine using in obtaining this result? If your actual efficiency is 0.18, how many kcal did you actually burn?

Q: Suppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 65 steps per…

A: Given data:Total time spent=30 min Rate of climbing=65 steps per minHeight of each step=8.0…

Q: Let two t ́machines be connected in s ́erie such that the heat released by the first t ́machine is…

A:

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A: Part (a): The 1 gram of gasoline gives 5×104 J of heat energy. Hence, the total heat energy (Q)…

Q: Let's say that a fridge operates between temperatures of 4°C and 31.0°C. A particular fridge has a…

A: T1 = 4oC T2 = 31oC COP = 4.50

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A: Given: The temperature of the cold reservoir is T1=200 The maximum efficiency is η=60% According…

Q: discards

A:

Q: A heat pump has a coefficient of performance equal to 4.15 and requires a power of 1.61 kW to…

A: Given:Co-efficient of performance, Bh = 4.15Poer, P = 1.61 kW

Q: A heat engine does 30 JJ of work per cycle while exhausting 30 JJ of waste heat. What is the…

A: Given in question - Work done per cycle (W) = 30 Joule                                   Heat…

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A: Carnot efficiency η=1-TCTH

Q: Second Law of thermodynamics. An engine in performing 196 J of work discharges 34 J of heat. What is…

A:

Q: What is its coefficient of performance?

A: Given:  Temperature of the refrigerator is -10.5∘C and the heat of the other environment is 60.0∘C…

Q: An electrical power station uses 1.58 x 1014 J of heat Input with an efficiency of 35.7%. (a) How…

A:

Q: Suppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 70 steps per…

A:

Q: what efficiency is the machine using in obtaining this result? % If your actual efficiency is 0.19,…

A: Given data:     The height of each step is: h = 8 in =20.32 cm The mass of person is: m= 150 lb =…

Q: A heat pump is a heating system that has an efficiency of about 150 %, that is, for every joule (J)…

A: Let us first look at the statement of Second Law of Thermodynamics, the Kelvin-Planck Statement:…

Q: A heat engine receives heat in the amount of Q,= 525 kJ from a high temperature thermal reservoir…

A: Given Amount of heat received by the heat engine Qh = 525 kJ Net work done by the heat engine Wnet…

Q: A heat engine exhausts 3 200 J of waste heat while performing 1 500 J of useful net work. What is…

A: Given data: Work done W=1500J Heat exhausted QC=3200J

Q: A freezer has a coefficient of performance of 6.30. The freezer is advertised as using 457 kW-h/y.…

A: Part A:

Q: The efficiency of a muscle during weight lifting is equal to the work done in lifting the weight…

A: efficiency of a muscle during weight lifting is equal to the work done in lifting the weight divided…

Q: a heat engine outputs 100 Joules work and releases 400 Joules to the cold source.  what is the heat…

A: The heat energy absorbed heat engine from the hot source is given by, Qh=W+Qc Here, W is the work…

Q: If the temperature inside the fridge is 35°F and the temperature outside is 70°F what is the maximum…

A:

Q: A refrigerator has a coefficient of performance of 3.25. How much work must be suppliedto this…

A: Given data: Coefficient of performance =3.25 Change in heat,Q=261 J Let work done be W: Applying The…

Q: What is the coefficient of performance of an ideal heat pump that pumps heat from a cold temperature…

A: given,TL=-23.9°C     =249.25 KTH=32°C      =305.15 Kcoefficient of performance:COP=THTH-TL

Q: What is the maximum coefficient of performance (COP) for a freezer that is set to maintain the cold…

A: The objective of the question is to calculate the maximum coefficient of performance (COP) for a…

Q: Problem 11: A heat engine receives heat in the amount of Q, = 750 kJ from a high temperature thermal…

A:

Q: A freezer has a coefficient of performance of 6.30. The freezer is advertised as using 525 kW-h/y.…

A: given coefficient of performance of 6.30 It is advertised as using 525 kWh/yr

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Q: 3.5x10^7 J of heat transfers into an engine. If 2.1x10^7 J of work is performed what is the…

A:

Q: Suppose you spend 30.0 minutes on a stairclimbing machine, climbing at a rate of 90.0 steps per…

A: The efficiency of the machine is

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Q: A heat engine extracts 45.0 kJ from the hot reservoir and exhausts 40.0 kJ into the cold reservoir.…

A: The work done by heat engine: W=QH-QC Efficiency η=1-QCQH Given QC=40kJ QH=45kJ

Q: In the past decades, coal was used to heat the engine of a steam locomotive. With the engine, a…

A: Given that:

Q: A heat engine extracts 59 kJkJ from the hot reservoir and exhausts 32 kJkJ into the cold reservoir.…

A:

Q: A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 524 and 287…

A: given data 2.4kJ of net work 3.6kJ of heat tempratures are 524k and 287k thermal efficiency = ?

Q: 2.0Kg of water at 0 degree celcius heated to 100 degree celcius. Compute its change in entropy. Mc…

A: Check out the form of chemical

Q: A heat pump removes 2060 J of heat from the outdoors and delivers 3060 J of heat to the inside of a…

A: Given data The heat removed by the pump is QL=2060 J The heat delivered by the house is QH=3060 J…

Q: A freezer has a coefficient of performance of 6.30. The freezer is advertised as using 433 kW-h/y.…

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Q: A refrigerator extracts 400 J of heat from a box during each cycle and rejects 600 J to a…

A: The formula for the coefficient of performance of the refrigerator is:

Q: Iceland has both high geothermal activity, with high temperatures near the surface, and abundant…

A: If the temperature of hot reservoir is 'T1' and the temperature of the cold reservoir is 'T2' , then…

Q: An engine does 3250 J of work and discards 5750 J of heat. Find the efficiency of this engine. Show…

A:

Q: Suppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 65 steps per…

A: Time spend on the machine t=30 minutes  The rate of climbing  = 65 steps / minutes  Height of each…

Q: To produce 96 hp of mechanical power, an automobile engine requires a supply of heat of 4.91  105 J…

A: Given data:  Output mechanical power (Pout) = 96 hp Rate of heat energy supply = 4.91×105 J/s…

Q: A heat pump has a coefficient of performance equal to 4.85 and requires a power of 1.76 kW to…

A:

Q: As a gasoline engine is running, the amount of gasoline containing 15,000J of chemical potential…

A: The given data are: TH=2500 KTL=300 K Here, TH denotes the higher temperature, and TL denotes the…