47. (a) Estimate the total power radiated into space by theSun, assuming it to be a perfect emitter at T = 5500 K.The Sun's radius is 7.0 × 10³ m. (b) From this, determinethe power per unit area arriving at the Earth, 1.5 × 101 maway (Fig. 14–20).r = 1.5 x 1011 mFIGURE 14-20SunEarthProblem 47.

(a) Sun's radius , R=7×108 m Total power radiated using Stefan's law,…

Answered: 47. (a) Estimate the total power…

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter21: Heat And The First Law Of Thermodynamics

Section: Chapter Questions

Problem 62PQ

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A physicist makes a cup of instant coffee and notices that, as the coffee cools, its level drops 3.00 mm in the glass cup. Show that this decrease cannot be due to thermal contraction by calculating the decrease in level if the 350 cm3 of coffee is in a 7.00-cm-diameter cup and decreases in temperature from 95.0 to 45.0 . (Most of the drop in level is actually due to escaping bubbles of air.)
Suppose a person is covered head to foot by wool clothing with average thickness of 2.00 cm and is transferring energy by conduction through the clothing at the rate of 50.0 W. What is the temperature difference across the clothing, given the surface area is 1.40 m2?
Check Your Understanding How much greater is the rate of heat radiation when body is at the temperature 40 than when it is at the temperature 20 ?
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Can carbon dioxide be liquefied at room temperature (20 If so, how? If not, why not? (See the phase diagram in the preceding problem.)
Soon 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.)
(15-56) An inventor claims to have built an engine that produces 2.00 MW of usable work while taking in 3.00 MW of thermal energy at 425 K, and rejecting 1.00 MW of thermal energt at 15 K. Is there anything fishy about his claim?
Suppose that a stove had a surface area of only 1.97 m2 . What would it's temperature (in kelvins) have to be so that it is still generated a net power of 7300 W ?
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The two concentric spheres of diameters Di = 20 cmand Do = 30 cm are separated by air at 1 atm pressure. Thesurface temperatures of the two spheres enclosing the air areTi = 320 K and To = 280 K, respectively. Determine the rateof heat transfer from the inner sphere to the outer sphere bynatural convection.
Oil at 60°C flows at a velocity of 20 cm/s over a5.0-m-long and 1.0-m-wide flat plate maintained at a constanttemperature of 20°C. Determine the rate of heat transferfrom the oil to the plate if the average oil properties arer = 880 kg/m3, m = 0.005 kg/m?s, k = 0.15 W/m?K, andcp = 2.0 kJ/kg?K.
Very high in the Earth’s atmosphere, the temperature canbe 700°C. Yet an animal there would freeze to death ratherthan roast. Explain.

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