On a trip, you notice that a 6.82 kg bag of ice lasts an average of 1 day in your cooler. What is the average power absorbed by the ice if the ice starts at 0°C and completely melts to liquid water at 0°C in exactly 1 day? The latent heat of fusion for water is 334 kJ/kg. Give your answer in units of watts. Question Credit: OpenStax College Physics P =

On a trip, you notice that a 6.82 kg bag of ice lasts an average of 1 day in your cooler. What is the average power absorbed by the ice if the ice starts at 0°C and completely melts to liquid water at 0°C in exactly 1 day? The latent heat of fusion for water is 334 kJ/kg. Give your answer in units of watts. Question Credit: OpenStax College Physics P =

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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On 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 W
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A cylinder contains 15 moles of Ozone gas at 46.85 degree Centigrade temperature. The molar mas of Ozone gas is 47.99 x 10^-3. Boltzmann's constant k = 1.38 x 10^-23 J/K. The total random kinetic energy of all the Ozone gas molecules is O a. 50857.2J O b. 82269 J O c. 38641.8 J O d. 59832 J
4) A ground source heat pump heats a building by extracting heat from the ground and pumping it into the building. Define: Qc = heat extracted from the ground, Qn= heat pumped into the building, W = electric energy used by the heat pump, Tc= temperature of the ground, T = temperature of building (Qc, Qn, and W are positive by definition). Assume Tr > Tc. a) Draw a diagram showing energy flow in and out of the heat pump. b) Write a general expression for the change AS in the entropy of the "universe", that is the heat pump plus the cold and hot reservoirs, in terms of the quantities defined above. Now assume ideal (reversible) operation, and take Te= 10 °C and Tp= 20 °C. What is the coefficient of performance (ČOP) of the heat pump? By what factor would this change if we had Tc = 0 °C instead?
The escape speed from the moon's surface is about 2380 m/s, and its atmospheric temperature ranges between 100 and 400 K. Take as an example an atmosphere of atomic hydrogen at the average temperature of 250 K to show why the moon would have no light elements in its atmosphere. You will need to employ a numerical integration. Answer:P(v>2380 m/s)=43.2%
QUESTION 9 During the video on heat conduction, H through a single pane window was calculated. Now, consider a window that has wo panes with a 6 mm air gap between them. Each pane has an area of 1.9 m. The window separates the inside of a house at 22 °C from the outside at 0°C. Let Kair = 0.03 W/(m-K). Hint: This problem can be simplified by noting that the thermal conductivity of glass is much greater than air, so the effect of the glass on the total conductivity can be ignored. Therefore, the purpose of the two glass panes is to support the layer of air between them. Calculate the heat current H through the double glass pane window in watts. Do not include units in your answer and state your numerical answer in normal form. QUESTION 10 Consider process 3 in the figure below (or in First_Exam_Figures.pdf) shown by the bold solid line with an arrowhead. The pressure of a gas is decreased at constant volume. V. Click Save and Submit to save and submit. Click Save All Ansuers to save all…
Q3 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/kg
The density of ice and water are 917 kg/m³ and 1000 kg/m³. The latent heat for the transition between ice and water is 334 kJ/kg. Calculate the slope of the tangent of the coexistence curve of ice and water at T = 213 K. Select one: dP dT a. b. C. O d. dP dT dP dT dP dT = - -170 atm/K = — - - 181 atm/K -203 Pa/K -183 Pa/K
Discussions Assignments A gas with an initial temperature of 940 °C undergoes the process shown in the figure. (Eigure 1) Figure p (atm) 3 2 1 0 0 100 200 300 V (cm³) 1 of 1 > ▼ Submit ✔ Correct Part B What is the final temperature in C? Express your answer using two significant figures. T₁= 32 Submit Previous Answers IVE ΑΣΦ Part C X Incorrect; Try Again; 3 attempts remaining Previous Answers Request Answer v= 0.006 How many moles of gas are there? Express your answer to two significant figures and include the appropriate units. Provide Feedback C mol Submit Previous Answers Request Answer ? ? X Incorrect; Try Again; 4 attempts remaining P Pearson °C Copyright © 2022 Pearson Education Inc. All rights reserved. | Terms of Use | Privacy Policy | Permissions | Contact Us
H.w: nitrogen gas flows into a convergent nozzle at 200 kpa.400 K and very low velocity .it flows out of the nozzle at 100 kpa.330 K.ifthe nozzle is insulated find the exit velocity.C, for nitrogen =1.042
A 1.0-kilogram cube of ice made from distilled water initially at 0 degree Celsius is placed in an adiabatic vessel containing 2.0 liters of distilled water initially at a temperature of 25 degrees Celsius. Using the information given below, answer the questions that follow: a. How many grams of the ice melts at the equilibrium condition b. How many grams of the ice will remain unmelted (if there's still any) at the equilibrium condition? c. What is the absolute temperature (in Kelvins) at the equilibrium condition? Water liquid form ice form density (g/mL) 1.00 0.997 Cp (J/ K*mole) 75.35 37.71 ΔHfusion (KJ/mole) 6.02 ΔHvaporization (KJ/mole) 40.657
*7. 00 A copper-constantan thermocouple generates a voltage of 4.75 x 10- volts when the temperature of the hot junction is 110.0 °C and the refer- ence junction is kept at a temperature of 0.0 °C. If the voltage is propor- tional to the difference in temperature between the junctions, what is the temperature of the hot junction when the voltage is 1.90 × 10-³ volts?