21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 14, Problem 13QP
To determine
The energy transport out of sun’s core.
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Two stars, A and B, have the same emissivity, but the radii and surface temperatures are different with RA = 0.5RB, and TA = 2TB. Assuming the temperature of space to be negligible, which star radiates the most energy per unit time?
a. Star Ab. Star Bc. Both radiate the same amount of energy per unit time.d. More information is needed in order to make a determination.
3. The solar constant (Gsc) measured by a scientist is reported as 1385 W/m2. Assume the
total hemispherical emissivity is 0.90 on the sun's surface.
temperature (in absolute temperature) on sun by using the following information:
Estimate the surface
Diameter of sun = 1.39 x 10° km
Diameter of earth = 1.28 x 10 km
Thickness of atmosphere on earth=40 km
%3!
Average distance between sun and earth = 1.495 x 108 km
Suggested reading materials: The chapters regarding "Fundamentals of Thermal Radiation"
and "Radiation Exchange between Black Surfaces" in any Heat Transfer textbook.
6. A 2 kg mass is dropped to the ground through a conducting loop. The mass starts 3 meters off the
ground with zero velocity, and it lands with a velocity 7 meters/second. You may take g to be 9.8 m/s^2
and ignore all other forces than gravity and electricity + magnetism. How much energy did the
conducting loop dissipate (release) as heat and how do you know?
Chapter 14 Solutions
21st Century Astronomy
Ch. 14.1 - Prob. 14.1ACYUCh. 14.1 - Prob. 14.1BCYUCh. 14.2 - Prob. 14.2CYUCh. 14.3 - Prob. 14.3CYUCh. 14.4 - Prob. 14.4CYUCh. 14 - Prob. 1QPCh. 14 - Prob. 2QPCh. 14 - Prob. 3QPCh. 14 - Prob. 4QPCh. 14 - Prob. 5QP
Ch. 14 - Prob. 6QPCh. 14 - Prob. 7QPCh. 14 - Prob. 8QPCh. 14 - Prob. 9QPCh. 14 - Prob. 10QPCh. 14 - Prob. 11QPCh. 14 - Prob. 12QPCh. 14 - Prob. 13QPCh. 14 - Prob. 14QPCh. 14 - Prob. 15QPCh. 14 - Prob. 16QPCh. 14 - Prob. 17QPCh. 14 - Prob. 18QPCh. 14 - Prob. 19QPCh. 14 - Prob. 20QPCh. 14 - Prob. 21QPCh. 14 - Prob. 22QPCh. 14 - Prob. 23QPCh. 14 - Prob. 24QPCh. 14 - Prob. 25QPCh. 14 - Prob. 26QPCh. 14 - Prob. 27QPCh. 14 - Prob. 28QPCh. 14 - Prob. 29QPCh. 14 - Prob. 30QPCh. 14 - Prob. 31QPCh. 14 - Prob. 34QPCh. 14 - Prob. 35QPCh. 14 - Prob. 36QPCh. 14 - Prob. 37QPCh. 14 - Prob. 38QPCh. 14 - Prob. 39QPCh. 14 - Prob. 40QPCh. 14 - Prob. 41QPCh. 14 - Prob. 42QPCh. 14 - Prob. 43QPCh. 14 - Prob. 44QPCh. 14 - Prob. 45QP
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- 5. Farad II. Solve the following problem pertaining to heat transfer. It is recommended to go to the FAQ section near the last pages to have an example and be able to answer common questions. 1. Suppose a 12-gauge copper wire, which has twice the diameter of the common 18-gauge wire (1.02mm diameter). If the current remains the same, what effect would this have on the magnitude of the drift velocity (i) none– vd would be unchanged; (ii) vd would be twice as great; (iii) vd would be four times greater; (iv) vd would be half as great; (v) vd would be one-fourth as great. Vd. Use the formula | 1 = nqvgAarrow_forwardIdentify whether the given situations are examples of conduction, convection orradiation.a. Solar ultraviolet radiation, precisely the process that determines the Earth’stemperature.b. Ironing of clothesc. When you walk barefoot on the hot street, and it burns your toes.d. The heat transferred by hand or hair dryere. When teaspoons get hot when placed in hot coffeef. The heat transfer generated by the human body when a person is barefoot.g. The heat emitted by a radiator.h. A thermometer works because the liquid in it contracts when heated.arrow_forward1. What is the relationship between the coefficient of thermal linear expansion and the change in length?arrow_forward
- 5. Calculate the temperature of the solar surface if the radiant intensity at the sun's surface is 63 MW/m². Stefan-Boltzmann constant o = 5.67 x 10-8 W/m²/K4 6. A 3.0 g bullet moving at 120 m/s on striking a 50 g block of wood is arrested within the block. Calculate the rise of temperature of the bullet if (a) the block is fixed; (b) the block is free to move. The specific heat of lead is 0.031 cal/g °C.arrow_forwardFinal Exam (page 14 of 32) (2) WhatsApp My Questions | bartleby A courses.nu.edu.eg/mod/quiz/attempt.php?attempt=570408&cmid=784528&page=13 I Apps M Gmail YouTube B Royalty Free Music. khdmat-online - .. dazi 1 Play Chess Online f. For the following charge distribution, if Q1= -6*10°C, Q2 = 5*10°C and Q3 =4*10°C, then, the electric potential in volt at A is Question 14 Not yet answered Q3 Marked out of 1.00 A P Flag question 3m Q1 Q2 4m Select one: O a. -9V O b. - 6V O c.OV O d. 3V O e. 6 V Previous page Next page P Type here to search Ps Lr 立arrow_forwardC 6. For solar collectors, what combination of surface characteristics is required? b. High absorptivity and high reflectivity High absorptivity and high emissivity High emissivity and low absorptivity d. High absorptivity and low emissivity c.arrow_forward
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