College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Related questions
Question
Transcribed Image Text:The structure of a house is such that it loses heat at a rate of 4500 kJ/h per 'C difference between the indoors and outdoors. A heat
pump that requires a power input of 4.5 kW is used to maintain this house at 24°C. Determine the lowest outdoor temperature for
which the heat pump can meet the heating requirements of this house.
The lowest outdoor temperature for which the heat pump can meet the heating requirements of this house is -
*c.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution
Trending nowThis is a popular solution!
Step by stepSolved in 3 steps with 3 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Rubbing your hands together warms them by converting work into thermal energy. a. If a woman rubs her hands a total of 19 times (forward and backwards count separately), at a distance of 7.75 cm per rub, and with an average frictional force of 39 N, what is the temperature increase of her hands, in degrees Celsius? The mass of tissues warmed is only 0.100 kg, mostly in the palms and fingers, and the heat capacity of her hands is 3500 J/(kg⋅°C).arrow_forward1. Suppose a woman does 500 J of work and -9400 J of heat transfer occurs into the environment in the process. (a) What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.) ΔΕint ✓ J (b) The internal energy is stored energy due to food intake. Treating the change in internal energy as the input energy and work done as output, what is her efficiency? Efficiency, Eff: % (c) What physics law did you use in this problem? Zeroth Law of Thermodynamics First Law of Thermodynamics Second Law of Thermodynamicsarrow_forwardV3arrow_forward
- Book: Sustainable Energy, Si Edition, 2nd Edition by Richard A. Dunlop Chapter 15 - Problem 6. Assume that geothermal heat transfer (at least near the surface of the earth) is by conduction through the crust rocks. For an average geothermal heat flow of 0.087 W/m2 and typical thermal gradient of 1008C/km, calculate the thermal conductivity of the rock. Compare with the known thermal conductivities of similar materials given in Chapter 8.arrow_forwardA 450 g metal cube which is originally at 110 degree(s) C oven is dropped into 0.003 m3 of water in a at 70 degrees Celcuis in an insulated cup. After both water and cube reached thermal equilibrium, the final temp is 78 degrees Celsius. What is the specific heat capacity of the uknown metal cube? cWater= 4200 j/kgK cCube=? A. 2800 j/kgk B. 7000 j/kgk C. 6500 j/kgk D. 5100 j/kgk E. Nonearrow_forwardSuppose you want to raise the temperature of a 0.18-kg piece of ice from -20.0°C to 130°C. The heat of fusion is Lf = 334 kJ/kg, and the heat of vaporization is Lv = 2256 kJ/kg. In this problem, take 1520 J/kg⋅°C as the specific heat of steam, and 2090 J/kg⋅°C as the specific heat of ice. a.) How much heat, in kilocalories, must be transferred for this to happen, including the energy needed for phase changes? b.) How much time, in seconds, is required to do this, assuming a constant 20.0 kJ/s rate of heat transfer?arrow_forward
- DA 824g glass pan of specific heat 792 J/kg. C kept on a stove and 0.545 L water of specific heat 4186 J/kg. C in it are heated from 24°C to 78°C. How much heat is required to raise the temperature of (a) the pan kJ (b) the water - kJ II) When two objects are in then heat floWS out from hot to cold. During this process the internal energy of while it for the cold system. This process continues until they the hot system state. reach thearrow_forwardA hollow cylinder has length L, inner radius R, and thickness d, and the temperatures at the inner and outer surfaces are Tn and Ti, respectively. The thermal conductivity of the material of which the cylinder is made is k. Derive an equation for the rate of heat transfer P through the walls of the cylinder. Simplify this equation assuming that the thickness of the cylinder d is much smaller than the its inner radius R.arrow_forwardOn a trip, you notice that a 5.30-kg bag of ice lasts an average of one day in your cooler. What is the average power in watts entering the ice if it starts at 0°C and completely melts to 0°C water in exactly 24 hours (1 Watt-1 Joule/second and Latent heat of fusion of water is 334 kJ/kg and latent heat of vaporisation of water is 2256 kJ/kg) O A. 20.49 W O B. 1770 W ○ C. 20.49 kW O D. None of the options provided is correct. O E. 78.44 Warrow_forward
- The graph below shows the change of phase of ice (-20 °C) to steam when heat is added. Temperature C) లడ్ ఉవి 100 °C 券 福 券 1 B 0°C 3 4 Heat (cal) లడస్ ఉండుగం కశడి ి ce -20 °C Which parts of the graph shows ice at 0°C ? Select one: a. B Activate Wind Go to Settings to a b. C C. A E. 2.arrow_forwardQ3 The gases in the cylinder of an internal combustion engine have a specific internal energy of 800 kl/kg and specific volume of 0.06 m:/kg at the beginning of expansion. The expansion of the gases may be assumed to take place according to a reversible law, pv"= constant, from 55 bar to 1.4 bar. The specific internal energy after expansion is 230 kJ/kg. Calculate the heat rejected to the cylinder cooling water per kilogram or gases during the expansion stroke. The worke done by the system is 465.96 kj/kgarrow_forwardThe phenomena of "wind chill" is a complicated combination of heat transfer through convection and conduction. The following table estimates the effective temperatures due to wind chill for a variety of air temperatures and wind speeds. a. At what temperature, in degrees Celsius, does still air cause the same effective temperature as -5°C air moving at 15 m/s?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
University Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSON
Introduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press 
Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Lecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-Wesley
College Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON
College Physics
Physics
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
University Physics (14th Edition)
Physics
ISBN:9780133969290
Author:Hugh D. Young, Roger A. Freedman
Publisher:PEARSON
Introduction To Quantum Mechanics
Physics
ISBN:9781107189638
Author:Griffiths, David J., Schroeter, Darrell F.
Publisher:Cambridge University Press
Physics for Scientists and Engineers
Physics
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:9780321820464
Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:Addison-Wesley
College Physics: A Strategic Approach (4th Editio...
Physics
ISBN:9780134609034
Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:PEARSON