Figure 14.3Temp.TimeIn Figure 14.3, heat is added to a pure substance in a closed container at a constant rate. A graph ofthe temperature of the substance as a function of time is shown here. If LF = latent heat of fusionand LV = latent heat of vaporization, what is the value of the ratio LV/LF for this substance?A) 3.5B) 7.2C) 4.5D) 1.5E) 5.0

From the graphThe time for fusion, tf = 2 unitsThe time for vaporization, tv = 7 units

Answered: Figure 14.3 Temp. Time In Figure 14.3,…

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter1: Temperature And Heat

Section: Chapter Questions

Problem 48P: A person taking a reading of the temperature in a freezer in Celsius makes two mistakes: first...

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A person taking a reading of the temperature in a freezer in Celsius makes two mistakes: first omitting the negative sign and then thinking the temperature is Fahrenheit. That is, the person reads xC as xF . Oddly enough, the result is the correct Fahrenheit temperature. What is the original Celsius reading? Round your answer to three significant figures.
One easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose a single-story cubical house already had 15 cm of fiberglass insulation in the attic and in all the exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, by what percentage would the heating cost of the house drop? Take the house to have dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors, and assume that the interior is uniformly at one temperature and the exterior is uniformly at another.
A high-end gas stove usually has at least one burner rated at 14 000 Btu/h. (a) If you place a 0.25-kg aluminum pot containing 2.0 liters of water at 20.C on this burner, how long will it take to bring the water to a boil, assuming all the heat from the burner goes into the pot? (b) Once boiling begins how much time is required to boil all the water out of the pot?
How much stress is cleated in a steel beam if its temperature changes from 15 to 40 but it cannot expand? For steel, the Young's modulus Y=210109N/m2 from Stress, Strain, and Elastic Modulus (http://cnx.org/content/m58342/latest/#fs-id1163713086230). (Ignore the change in area resulting from the expansion.)
A Styrofoam cooler has total wall area (including the lid) of 0.80m2 and wall thickness 2.0 cm. It is filled with ice, water, and cans of Omni-Cola, all at 0°C. What is the rate of heat flow into the cooler if the temperature of the outside wall is 30°C.? How much ice melts in 3 hours? Ksytrofoam=0.027 W/m-K A. 34.2 W , 1.04 kg B. 32.4 W , 1.04 kg C. 32.4 W , 1.40 kg D. 34.2 W , 1.40 kg
On a cold winter day when the temperature is -20.0 ∘C, what is the amount of heat needed to warm to internal body temperature (37.0∘C) the 0.550 L of air exchanged with each breath? Assume that the specific heat capacity of air is 1020 J/(kg⋅K) and that 1.0 L of air has a mass of 1.3 g. Express your answer in joules. How much heat is lost per hour if the respiration rate is 19.0 breaths per minute?
A glass window is 3.7 mm thick, is 2.29 m tall by 1.04 m wide, and has a thermal conductivity of 1.0 W/m K. What is the rate of heat loss (in W) through the window if the inside temperature is 22.3° C and the outside temperature is -20.7 ° C ?
A cryogenic chamber has insulating walls that are 3cm thick. When at operating temperature, it leaks heat at a rate of 190 J/s. If the chamber walls are made to be 9cm thick and otherwise identical, at what rate will heat leak into the chamber?
Radioactive decay of elements in the earth’s interior results in a mean heat flux through the Earth’s surfaceof 5×10−2Wm−2. What is the flux expressed as a fraction of the energy flux due to thermal re-radiation of absorbed solar energy? If radioactive decay were the only heat source for the Earth, what would the Earth’s temperature be?
When the indoor temperature of a house is 25°C and the outdoor temperature is -8°C, the inside and outside surfaces of the glass are measured to be 20.3°C and 18.8°C. If the glass has an area of 2.74 m2 and a thickness of 6.55 mm, what is the rate of heat (in W) lost though the window [round your final answer to zero decimal places]? {kglass = 0.78 W/m∙K}
In an winter month the weather channel reported that the current temp at the Galen of Fairbanks in alaska is 5 degrees F while at the same time the temp in Mexico City was 5 degrees C what is the difference in temperature between the two cities in the unit of degree K??
At a foundry, 22 kg of molten aluminum witha temperature of 660.4◦C is poured into amold.If this is carried out in a room containing150 kg of air at 25◦C, what is the temperatureof the air after the aluminum is completelysolidified? Assume that the specific heat capacity of air is 1.0×10^3J/kg ·◦C. The specificheat of aluminum is 899 J/kg ·◦ C and its latent heat of fusion is 3.97 × 10^5J/kg.Answer in units of ◦C

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