College Physics
10th Edition
ISBN: 9781285737027
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Chapter 11.5, Problem 11.5QQ
Stars A and B have the same temperature, but star A has twice the radius of star B. (a) What is the ratio of star A’s power output to star B’s output due to
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Chapter 11 Solutions
College Physics
Ch. 11.2 - Prob. 11.1QQCh. 11.4 - Prob. 11.2QQCh. 11.5 - Will an ice cube wrapped in a wool blanket remain...Ch. 11.5 - Two rods of the same length and diameter are made...Ch. 11.5 - Stars A and B have the same temperature, but star...Ch. 11 - Prob. 1WUECh. 11 - Physics Review An athlete lifts a 175-kg barbell...Ch. 11 - Prob. 3WUECh. 11 - Convert 3.50 103 cal to the equivalent number of...Ch. 11 - Prob. 5WUE
Ch. 11 - Prob. 6WUECh. 11 - A large room in a house holds 975 kg of dry air at...Ch. 11 - A wooden wall 4.00 cm thick made of pine with...Ch. 11 - A granite ball of radius 2.00 m and emissivity...Ch. 11 - Rub the palm of your hand on a metal surface for...Ch. 11 - In winter, why did the pioneers store an open...Ch. 11 - In warm climates that experience an occasional...Ch. 11 - Prob. 4CQCh. 11 - On a clear, cold night, why does frost tend to...Ch. 11 - The U.S. penny is now made of copper-coated zinc....Ch. 11 - Cups of water for coffee or tea can be warmed with...Ch. 11 - Prob. 8CQCh. 11 - A tile floor may feel uncomfortably cold to your...Ch. 11 - On a very hot day, its possible to cook an egg on...Ch. 11 - Concrete has a higher specific heat than does...Ch. 11 - You need to pick up a very hot cooking pot in your...Ch. 11 - A poker is a stiff, nonflammable rod used to push...Ch. 11 - Star A has twice the radius and twice the absolute...Ch. 11 - Prob. 15CQCh. 11 - The highest recorded waterfall in the world is...Ch. 11 - The temperature of a silver bar rises by 10.0C...Ch. 11 - Lake Erie contains roughly 4.00 1011 m3 of water....Ch. 11 - An aluminum rod is 20.0 cm long at 20.0C and has a...Ch. 11 - A 3.00-g copper coin at 25.0C drops 50.0 m to the...Ch. 11 - Prob. 6PCh. 11 - A 75-kg sprinter accelerates from rest to a speed...Ch. 11 - A sprinter of mass m accelerates uniformly from...Ch. 11 - Prob. 9PCh. 11 - Prob. 10PCh. 11 - Prob. 11PCh. 11 - A 1.5-kg copper block is given an initial speed of...Ch. 11 - A certain steel railroad rails 13 yd in length and...Ch. 11 - Prob. 14PCh. 11 - What mass of water at 25.0C must be allowed to...Ch. 11 - Lead pellets, each of mass 1.00 g, are heated to...Ch. 11 - Prob. 17PCh. 11 - In a showdown on the streets of Laredo, the good...Ch. 11 - Prob. 19PCh. 11 - A 1.50-kg iron horseshoe initially at 600C is...Ch. 11 - A student drops two metallic objects into a 120-g...Ch. 11 - When a driver brakes an automobile, the friction...Ch. 11 - Equal 0.400-kg masses of lead and tin at 60.0C are...Ch. 11 - Prob. 24PCh. 11 - A 75-g ice cube al 0C is placed in 825 g of water...Ch. 11 - Prob. 26PCh. 11 - Prob. 27PCh. 11 - Prob. 28PCh. 11 - Prob. 29PCh. 11 - Prob. 30PCh. 11 - Prob. 31PCh. 11 - Prob. 32PCh. 11 - A high-end gas stove usually has at least one...Ch. 11 - Prob. 34PCh. 11 - Steam at 100.C is added to ice at 0C. (a) Find the...Ch. 11 - The excess internal energy of metabolism is...Ch. 11 - A 3.00-g lead bullet at 30.0C is fired at a speed...Ch. 11 - A glass windowpane in a home is 0.62 cm thick and...Ch. 11 - A pond with a flat bottom has a surface area of...Ch. 11 - The thermal conductivities of human tissues vary...Ch. 11 - A steam pipe is covered with 1.50-cm-thick...Ch. 11 - The average thermal conductivity of the walls...Ch. 11 - Consider two cooking pots of the same dimensions,...Ch. 11 - A thermopane window consists of two glass panes,...Ch. 11 - A copper rod and an aluminum rod of equal diameter...Ch. 11 - A Styrofoam box has a surface area of 0.80 m and a...Ch. 11 - A rectangular glass window pane on a house has a...Ch. 11 - Prob. 48PCh. 11 - Measurements on two stars indicate that Star X has...Ch. 11 - The filament of a 75-W light bulb is at a...Ch. 11 - The bottom of a copper kettle has a 10.0-cm radius...Ch. 11 - A family comes home from a long vacation with...Ch. 11 - A 0.040.-kg ice cube floats in 0.200 kg of water...Ch. 11 - The surface area of an unclothed person is 1.50...Ch. 11 - A 200-g block of copper at a temperature of 90C is...Ch. 11 - Prob. 56APCh. 11 - A student measures the following data in a...Ch. 11 - Prob. 58APCh. 11 - A class of 10 students; taking an exam has a power...Ch. 11 - A class of 10 students taking an exam has a power...Ch. 11 - A bar of gold (Au) is in thermal contact with a...Ch. 11 - An iron plate is held against an iron, wheel so...Ch. 11 - Prob. 63APCh. 11 - Three liquids are at temperatures of 10C, 20C, and...Ch. 11 - Prob. 65APCh. 11 - A wood stove is used to heat a single room. The...Ch. 11 - Prob. 67APCh. 11 - Prob. 68APCh. 11 - The surface of the Sun has a temperature of about...Ch. 11 - The evaporation of perspiration is the primary...Ch. 11 - Prob. 71APCh. 11 - An ice-cube tray is filled with 75.0 g of water....Ch. 11 - An aluminum rod and an iron rod are joined end to...
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- (1a). Figure shows a copper rod AB being heated at one end. Explain how the heat transfers from A to B. What is the name of this method? copper rod B Bunsen burner (1b). The Earth can be considered to be a perfect black body radiator at a temperature of 112 F. Radius of Earth is 6390 km. Calculate the total power radiated from the Earth in Watts (W)arrow_forward(A) Every square meter area facing the Sun, at the distance 1 AU from the Sun, receives radiant power = 1.368 kW. Therefore, what is the total power radiated by the Sun? (B) Imagine a spacecraft at distance d from the Sun, which has a solar panel with area A and efficiency e. (I.e., the solar panel converts this fraction of incident sunlight to electric power.) How much electric power can the solar panel produce for the spacecraft? d = 1.56 AU; A = 7.02 m^2; e = 28.5 percent;arrow_forwardThe amount of radiant energy emitted by a surface is given by q = ɛ0 AT+ where q represents the rate of thermal energy (per unit time) emitted by the surface in watts; e = the emissivity of the surface 0<ɛ<1 and is unitless o = Stefan-Boltzman constant (o = 5.67×10% ) A represents the area of the surface in m² Ty = surface temperature of the object expressed in kelvin What are the appropriate units for o if the equation is to be homogeneous in units?arrow_forward
- A star such as our Sun will eventually evolve to a “red giant” star and then to a “whitedwarf” star. A typical white dwarf is approximately the size of Earth, and its surfacetemperature is about 2.5×103 K. A typical red giant has a surface temperature of 3.0×104K and a radius ~100,000 times larger than that of a white dwarf.a) What is the average radiated power per unit area by each of these types of stars?b) What is the ratio of total power radiated from the white dwarf over the power of thered giant? assume that both stars have emission e = 1arrow_forwardThe next four questions use this description. Our Sun has a peak emission wavelength of about 500 nm and a radius of about 700,000 km. Your dark-adapted eye has a pupil diameter of about 7 mm and can detect light intensity down to about 1.5 x 10-11 W/m2. Assume the emissivity of the Sun is equal to 1. First, given these numbers, what is the surface temperature of the Sun in Kelvin to 3 significant digits? What is the power output of the Sun in moles of watts? (in other words, take the number of watts and divide it by Avogadro's number) Assuming that all of the Sun's power is given off as 500 nm photons*, how many photons are given off by the Sun every second? Report your answer to the nearest power of 10 (e.g. if you got 7 x 1024, give your answer as 25).arrow_forwardThe spectral emittance curve for the star Rigel A is a good approximation of the curve for a blackbody. The maximum of this curve is at 239 nm. Find (a) the surface temperature of Rigel A and (b) the power that Rigel A radiates per unit surface area.arrow_forward
- The sun can be treated as a blackbody at an effective surface temperature of 10,400 R. Determine the rate at which infrared radiation energy (l = 0.762100 mm) is emitted by the sun, in Btu/h·ft2.arrow_forwardThe equation of hydrostatic equilibrium is dP/dr = ( −GMr / r2 ) ρ where Mr is the mass interior to the radius r, and ρ is the density.Consider the atmosphere of a star which is isothermal. You may assume that the mass of theatmosphere does not contribute significantly to the total mass of the star, so that the surfacegravity g = GMr/r2 is constant at all heights in the isothermal atmosphere. Assume an idealgas law P = nkT = (ρ/µmH) kT, where µ is the mean molecular weight and mH is the mass of ahydrogen atom. By solving the equation of hydrostatic equilibrium with these approximations, show that P(r) = P(0) exp ((−gµmH/kT)r) Briefly describe the meaning of the expression kT/gµmH. Some white dwarfs have an atmosphere of mostly hydrogen plasma, whereas others have an atmosphere dominated by helium plasma. For the simple model above, briefly discuss what major difference would be seen between these two cases. You can assume the same temperature and surface gravity for the two cases.arrow_forwardA spherical surface of area 0.5m2, emissivity 0.85 and temperature 132°C is placed in a large, evacuated chamber whose walls are maintained at fixed temperature. Find the rate at which radiation is emitted by the surface? ( Stefan's constant σ = 5.67 x 10-8 W/m2T4 ) Energy radiated per second in watts =?arrow_forward
- For a natural gas air flame, calculate the relative intensity of the 589.6nm emission line for sodium at 3.5cm above the orifice(T=1857C) to the line at 1.9cm above the orifice (1700C)arrow_forwardUse the value of the solar energy flux on Earth to determine the radius of the Sun. Assuming that the Sun's temperature is 5780 K and that its emissivity is 1, find its radius in kilometers. Neglect the temperature of the environment.arrow_forward1. (a) What is the average kinetic energy in joules of a hydrogen atom on the 5500 °C surface of the Sun? The Boltzmann's constant is k=1.38x10-23 J/K J KE av: (b) What is the average kinetic energy of a helium atom in a region of the solar corona where the temperature is 6 x 105⁰K? KE av: Jarrow_forward
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Heat Transfer: Crash Course Engineering #14; Author: CrashCourse;https://www.youtube.com/watch?v=YK7G6l_K6sA;License: Standard YouTube License, CC-BY