Physics: Principles with Applications
7th Edition
ISBN: 9780321625922
Author: Douglas C. Giancoli
Publisher: Addison-Wesley
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Textbook Question
Chapter 14, Problem 47GP
(a) Estimate the total power
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47. (a) Estimate the total power radiated into space by the
Sun, assuming it to be a perfect emitter at T = 5500 K.
The Sun's radius is 7.0 × 10³ m. (b) From this, determine
the power per unit area arriving at the Earth, 1.5 × 101 m
away (Fig. 14–20).
r = 1.5 x 1011 m
FIGURE 14-20
Sun
Earth
Problem 47.
(II) (a) How much power is radiated by a tungsten sphere
(emissivity e = 0.35) of radius 19 cm at a temperature of
25°C? (b) If the sphere is enclosed in a room whose walls
are kept at –5°C, what is the net flow rate of energy out of
the sphere?
(II) Typical temperatures in the interior of the Earth and
Sun are about 4000°C and 15 x 106 °C, respectively.
(a) What are these temperatures in kelvins? (b) What
percent error is made in each case if a person forgets to
change °C to K?
Chapter 14 Solutions
Physics: Principles with Applications
Ch. 14 - Prob. 1OQCh. 14 - Prob. 1QCh. 14 - Prob. 2QCh. 14 - (a) If two objects of different temperatures are...Ch. 14 - In warm regions where tropical plants grow but the...Ch. 14 - Prob. 5QCh. 14 - Prob. 6QCh. 14 - Prob. 7QCh. 14 - Prob. 8QCh. 14 - Prob. 9Q
Ch. 14 - Prob. 10QCh. 14 - 11. Explorers on failed Arctic expeditions have...Ch. 14 - Prob. 12QCh. 14 - Prob. 13QCh. 14 - Prob. 14QCh. 14 - Prob. 15QCh. 14 - Prob. 16QCh. 14 - Prob. 17QCh. 14 - Prob. 18QCh. 14 - Prob. 19QCh. 14 - Prob. 20QCh. 14 - Prob. 21QCh. 14 - A premature baby in an incubator can be...Ch. 14 - Prob. 23QCh. 14 - Prob. 24QCh. 14 - Prob. 25QCh. 14 - 26. The Earth cools off at night much more quickly...Ch. 14 - Prob. 27QCh. 14 - Prob. 28QCh. 14 - Prob. 29QCh. 14 - Prob. 1MCQCh. 14 - Both beakers A and B in Fig. 14-15 [ contain a...Ch. 14 - 3. For objects at thermal equilibrium, which of...Ch. 14 - Prob. 4MCQCh. 14 - Prob. 5MCQCh. 14 - Prob. 6MCQCh. 14 - Prob. 7MCQCh. 14 - Prob. 8MCQCh. 14 - Prob. 9MCQCh. 14 - Prob. 10MCQCh. 14 - Prob. 11MCQCh. 14 - Prob. 12MCQCh. 14 - To what temperature will 8200 J of heat raise 3.0...Ch. 14 - How much heat (in joules) is required to raise the...Ch. 14 - Prob. 3PCh. 14 - An average active person consumes about 2500 Cal a...Ch. 14 - A British thermal unit (Btu) is a unit of heat in...Ch. 14 - How many joules and kilocalories are generated...Ch. 14 - A water heater can generate 32,000 kJ/h. How much...Ch. 14 - Prob. 8PCh. 14 - An automobile cooling system holds 18 L of water....Ch. 14 - What is the specific heat of a metal substance if...Ch. 14 - (a) How much energy is required to bring a 1.0-L...Ch. 14 - Prob. 12PCh. 14 - How long does it take a 750-W coffeepot to bring...Ch. 14 - 14. (II) What will be the equilibrium temperature...Ch. 14 - A 31.5-g glass thermometer reads 23.6°C before it...Ch. 14 - A 0.40-kg iron horseshoe, just forged and very hot...Ch. 14 - Prob. 17PCh. 14 - The heat capacity, C, ofan object is defined as...Ch. 14 - Prob. 19PCh. 14 - Prob. 20PCh. 14 - Prob. 21PCh. 14 - Estimate the Calorie content of 65 g of candy from...Ch. 14 - Prob. 23PCh. 14 - If 3.40 x 105 J of energy is supplied to a...Ch. 14 - How much heat is needed to melt 23.50 kg of silver...Ch. 14 - Prob. 26PCh. 14 - What mass of steam at 100°C must be added to 1.00...Ch. 14 - Prob. 28PCh. 14 - Prob. 29PCh. 14 - Prob. 30PCh. 14 - Prob. 31PCh. 14 - Prob. 32PCh. 14 - Prob. 33PCh. 14 - A cube of ice is taken from the freezer at -8.5°C...Ch. 14 - Prob. 35PCh. 14 - Prob. 36PCh. 14 - Prob. 37PCh. 14 - Prob. 38PCh. 14 - 39. How long does it take the Sun to melt a block...Ch. 14 - Prob. 40PCh. 14 - Two rooms, each a cube 4.0 m per side, share a...Ch. 14 - Prob. 42PCh. 14 - Approximately how long should it take 8.2 kg of...Ch. 14 - Prob. 44PCh. 14 - Suppose the insulating qualities of the wall of a...Ch. 14 - Prob. 46GPCh. 14 - (a) Estimate the total power radiated into space...Ch. 14 - Prob. 48GPCh. 14 - Prob. 49GPCh. 14 - A mountain climber wears a goose-down jacket 3.5...Ch. 14 - Prob. 51GPCh. 14 - Prob. 52GPCh. 14 - Prob. 53GPCh. 14 - Prob. 54GPCh. 14 - Prob. 55GPCh. 14 - Prob. 56GPCh. 14 - Prob. 57GPCh. 14 - Prob. 58GPCh. 14 - Prob. 59GPCh. 14 - Prob. 60GPCh. 14 - Prob. 61GPCh. 14 - Prob. 62GPCh. 14 - Prob. 63GPCh. 14 - Prob. 64GPCh. 14 - A leaf of area 40 cm2and mass 4.5 x 10-4kg...Ch. 14 - Prob. 66GPCh. 14 - Prob. 67GPCh. 14 - Prob. 68GP
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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
- (a) How much power is radiated by an iron sphere (emissivity e = 0.60) of radius 24 cm at a temperature of 205°C? (b) If the sphere is enclosed in a room whose walls are kept at -5°C, what is the net flow rate of energy out of the sphere?arrow_forward(II) Heat conduction to skin. Suppose 150 W of heat flows byconduction from the blood capillaries beneath the skin tothe body’s surface area of 1.5 m2 If the temperature difference is 0.50 C°, estimate the average distance of capillaries below the skin surface.arrow_forward•.20 GO In a certain experiment, a small radioactive source must move at selected, extremely slow speeds. This motion is accom- plished by fastening the source to one end of an aluminum rod and heating the central section of the rod in a controlled way. If the effective heated section of the rod in Fig. 18-31 has length d = 2.00 cm, at what constant rate must the temperature of the rod be changed if the source is to move at a constant speed of 100 nm/s? Radioactive Electric heater source J Clamp Figure 18-31 Problem 20. ·darrow_forward
- (a) How much heat does it take to increase the temperature of 2.50 mol of a diatomic by 50.0K near room temperature if the gas held at constant volume?arrow_forward(a) Calculate the rate of heat transfer by radiation from a car radiator at 110C into a 50.0C environment, if the radiator has an emissivity of 0.750 and a 1.20 m2 surface area. (b) Is this a significant fraction of the heat transfer by an automobile engine? To answer this, assume a horsepower of 200hp (1.5 kW) and the efficiency of automobile engines as 25%.arrow_forward(II) A 28-g ice cube at its melting point is dropped into an insulated container of liquid nitrogen. How much nitrogen evaporates if it is at its boiling point of 77 K and has a latent heat of vaporization of 200 KJ/kg ? Assume for simplicity that the specific heat of ice is a constant and is equal to itsvalue near its melting point.arrow_forward
- (a) Calculate the rate of heat transfer by radiation from a car radiator at 110°C into a 50.0ºC environment, if the radiator has an emissivity of 0.750 and a 1.20-m2 surface area. (b) Is this a significant fraction of the heat transfer by an automobile engine? To answer this, assume a horsepower of 200 hp (1.5 kW) and the efficiency of automobile engines as 25%.arrow_forwardSoon after the Earth formed, heat released by the decay of radioactive elements raised the average internal temperature from 300 to 3000 K, at about which value it remains today. Assuming an average coefficient of volume expansion of 3.0 x 10-5 K -1 , by how much has the radius of the Earth increased since its formation? (Let r = 6400km be the present radius of the Earth.)arrow_forward(i) State the assumptions made in deriving the expression P = pc² for a fixed mass of deal gas. (ii) Estimate the Kinetic energy of a steam molecule at 11 00C.arrow_forward
- (iii)the heat absorbed by the gas along the path QMarrow_forward(4) A certain process cools a body from 3500C to -800C. Express the change in temperature in (a) kelvins, and (b) Fahrenheit degrees. as-420arrow_forward(a) Calculate the rate of heat transfer by radiation from a car radiator at 110°C into a 50.0ºC environment, if the radiator has an emissivity of 0.750 and a 1.20−m2 surface area. (b) Is this a significant fraction of the heat transfer by an automobile engine? To answer this, assume a horsepower of 200hp(1.5kW) and the efficiency of automobile engines as 25%.arrow_forward
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