If the person in Example 17.5 is a Terminator machine that is composed of 99.99% Aluminum. How much energy is required to raise his temperature on the said problem ends somewhat on the initial temperature andthe temperature interval. Figure 17.17 shows this dependence for water. In this chapterwe'll usually ignore this small variation.4170TC)20 40 60 30 100EXAMPLE 17.5 Feed a cold, starve a feverDuring a bout with the flu an 80 kg man ran a fever of 39.0°C (102.2°F)instead of the normal body temperature of 37.0°C (98.6°F). Assumingthat the human body is mostly water, how much heat is required toraise his temperature by that amount?EVALUATE This corresponds to 160 kcal. In fact, the specific heat of thehuman body is about 3480 J/kg K, 83% that of water, because protein,fat, and minerals have lower specific heats. Hence a more accurate an-swer is Q = 5.6 x 10°J = 133 kcal. Either result shows us that wereit not for the body's temperature-regulating systems, taking in energy inthe fornt of food would produce measurable changes in body tempera-ture. (The elevated temperature of a person with the flu results from thebody's extra activity in response to infection.)IDENTIFY andSET UP This problem uses the relationshipamong heat (the target variable), mass, specific heat, and tem-perature change. We use Eq. (17.13) to determine the requiredheat Q. with m = 80 kg. c = 4190 J/kg K (for water), and37.0°C = 2.0 C = 2.0 K.KEYCONCEPT To find the amount of heat required to change thetemperature of a mass m of material by an amount AT, multiply m byAT and by the specific heat c of the material. Heat is positive when itflows into an object and negative when it flows out.AT%3D39.0°CEXECUTE From Eq. (17.13),0 = mc AT =(80 kg) (4190 J/kg · K)(2.0 K) = 6.7 x 10°JEXAMPLE 17.6 Overheating electronicsEXECUTE We divide both sides of Eq. (17.14) by dt and rearrange:You are designing an electronic circuit element made of 23 mgof silicon. The electric current through it adds energy at the rate of7.4 mWdO/dt7.4 X 10JA7.410 J/s. If your design doesn't allow any heat trans-0.46 KA

Heat required is Q= mcΔT specific heat c for aluminium is : 900 J/kg.K ΔT = 39 -37 oC = 2oC.

During a bout with the flu an 80 kg man ran a fever of 39.0°C (102.2°F) instead of the normal body temperature of 37.0°C (98.6°F). Assuming that the human body is mostly water, how much heat is required to raise his temperature by that amount?

During a bout with the flu an 80 kg man ran a fever of 39.0°C (102.2°F) instead of the normal body temperature of 37.0°C (98.6°F). Assuming that the human body is mostly water, how much heat is required to raise his temperature by that amount?

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter10: Thermal Physics

Section: Chapter Questions

Problem 26P: The density or gasoline is 7.30 102 kg/m3 at 0C. Its average coefficient of volume expansion is...

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The density or gasoline is 7.30 102 kg/m3 at 0C. Its average coefficient of volume expansion is 9.60 104(C)1 and note that 1.00 gal = 0.003 80 m3. (a) Calculate the mass of 10.0 gal of gas at 0C. (b) If 1.000 m3 of gasoline at 0C is warmed by 20.0C, calculate its new volume. (c) Using the answer to part (b), calculate the density of gasoline at 20.0C. (d) Calculate the mass of 10.0 gal of gas at 20.0C. (e) How many extra kilograms of gasoline would you get if you bought 10.0 gal of gasoline at 0C rather than at 20.0C from a pump that is not temperature compensated?
The density or gasoline is 7.30 102 kg/m3 at 0C. Its average coefficient of volume expansion is 9.60 104(C)1 and note that 1.00 gal = 0.003 80 m3. (a) Calculate the mass of 10.0 gal of gas at 0C. (b) If 1.000 m3 of gasoline at 0C is warmed by 20.0C, calculate its new volume. (c) Using the answer to part (b), calculate the density of gasoline at 20.0C. (d) Calculate the mass of 10.0 gal of gas at 20.0C. (e) How many extra kilograms of gasoline would you get if you bought 10.0 gal of gasoline at 0C rather than at 20.0C from a pump that is not temperature compensated?
What are the following temperatures on the Kelvin scale? (a) 68.0 F, an indoor temperature sometimes recommended for energy conservation in winter (b) 134 F, one of the highest atmospheric temperatures ever recorded on Earth (Death Valley, California, 1913) (c) 9890 F, the temperature of the surface of the Sun
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As an airplane flying with constant velocity moves from a cold air mass into a warm air mass, does the Mach number (a) increase, (b) decrease, or (c) remain the same?
A Styrofoam box has a surface area of 0.80 m and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0C, and the outside temperature is 25C. If it takes 8.0 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam.
The density of gasoline is 730 kg/m3 at 0C. Its average coefficient of volume expansion is 9.60 104 (C)1. Assume 1.00 gal of gasoline occupies 0.003 80 m3. How many extra kilograms of gasoline would you receive if you bought 10.0 gal of gasoline at 0C rather than at 20.0C from a pump that is not temperature compensated?
Supposed your refrigerator can remove heat at a power of 100 watts (100 joules per second), how long will it take to cool a liter of water from room temperature to 5°C? ( (Assuming the water is the only thing inside the fridge.) Hint: 1 calorie = 4.184 joules
How much steam with a temperature of 100° C must be added to 0.250 kg of ice at its melting point to end up with water at 25.0 C? Use the following values where appropriate:
Suppose one has a 50.0 ml sample of ethanol at 22.0oC (centigrade) and wants to warm it to 60.0oC (centigrade). How many kilojoules of heat will this take? The density of ethanol is 0.785 g/ml.
Suppose that the Earth wore a snug steel belt around its equator (r = 6378 km). If everyone on Earth breathed on this steel belt simultaneously so that the belt's temperature increased by 2°C, how high off of the Earth would the belt be lifted? Hint: the coefficient of linear expansion of steel is 0.000012 Convert your answer from km to feet. 1 km = 1000 m 1 meter = 3.28 feet
The density of gasoline is 7.30 x 102 kg/m3 at 0°C. Its average coefficient of volume expansion is 9.60 x 10-4(°C)-1, and note that 1.00 gal = 0.00380 m3. (a) Calculate the mass of 10.0 gal of gas at 0°C. (b) If 1.000 m3 of gasoline at 0°C is warmed by 20.0°C, calculate its new volume. (c) Using the answer to part (b), calculate the density of gasoline at 20.0°C. (d) Calculate the mass of 10.0 gal of gas at 20.0°C. (e) How many extra kilograms of gasoline would you get if you bought 10.0 gal of gasoline at 0°C rather than at 20.0°C from a pump that is not temperature compensated?