21st Century Astronomy And Learning Astronomy By Doing Astronomy (fifth Edition)
5th Edition
ISBN: 9780393613360
Author: Laura Kay, Ana Larson, Stacy Palen, George Blumenthal
Publisher: W. W. Norton & Company
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Chapter 11, Problem 34QP
(a)
To determine
The nature of the scales for the graph shown in Figure
(b)
To determine
The factor by which scale shown in Figure
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expressed as length { in meters
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QUESTION 1
Estimate The Temperature For A Planet In Other Solar System (Questions 1-3)
Let us assume scientists just discovered a planet orbiting a star in an extra-solar system. The star has a surface temperature Ts = 10000 Kelvins and a radius Sr = 1x109 meters. Scientists also measured the distance (D)
between the star and the planet as D = 2 AU - 3.0x1011 meters.
The solar power per unit area from the star's surface (Ps) can be calculated from the star's surface temperature Ts (10000 Kelvins) by the Stefen-Boltzman law Ps=0(Ts)4, where o is Stefen-Boltzman constant (5.67 x 10-8
Watt/meter2/Kelvin4). What is the solar power per unit area from the star's surface (Ps)?
O Ps ~ 2.87 x 108 Watt/meter2
O
Ps ~ 5.67 x 108 Watt/meter2
O
O
Ps ~ 2.87 x 10 Watt/meter2
Watt/meter²
Ps ~ 5.67 x 10⁹
QUESTION 2
The solar power (Ps) decreases from the star's surface to the distance at the planet. Assuming the solar power per unit area at the distance of the planet as Pp, we have Pp=Ps(Sr/D)2, where…
Calculate the angle a person needs to lean from the vertical when
1. walking a 14 m (radius) circular track at 22 mins per mile, and
Enter to 2 significant figures
Angle with respect to the vertical =
= 0.85
! No, that's not the correct answer.
O
2. running at 4 min per mile.
Enter to 2 significant figures
Angle with respect to the vertical = 6.8
Use 1 mile = 1609.4 m
Sense-making: Do your results for the leaning angle during walking agree with your observations
about people walking on circular tracks?
O
Chapter 11 Solutions
21st Century Astronomy And Learning Astronomy By Doing Astronomy (fifth Edition)
Ch. 11.1 - Prob. 11.1CYUCh. 11.2 - Prob. 11.2CYUCh. 11.2 - Prob. 11.3CYUCh. 11.3 - Prob. 11.4CYUCh. 11.4 - Prob. 11.5CYUCh. 11 - Prob. 1QPCh. 11 - Prob. 2QPCh. 11 - Prob. 3QPCh. 11 - Prob. 4QPCh. 11 - Prob. 5QP
Ch. 11 - Prob. 6QPCh. 11 - Prob. 7QPCh. 11 - Prob. 8QPCh. 11 - Prob. 9QPCh. 11 - Prob. 10QPCh. 11 - Prob. 11QPCh. 11 - Prob. 12QPCh. 11 - Prob. 13QPCh. 11 - Prob. 14QPCh. 11 - Prob. 15QPCh. 11 - Prob. 16QPCh. 11 - Prob. 17QPCh. 11 - Prob. 18QPCh. 11 - Prob. 19QPCh. 11 - Prob. 20QPCh. 11 - Prob. 21QPCh. 11 - Prob. 22QPCh. 11 - Prob. 23QPCh. 11 - Prob. 24QPCh. 11 - Prob. 25QPCh. 11 - Prob. 26QPCh. 11 - Prob. 27QPCh. 11 - Prob. 28QPCh. 11 - Prob. 29QPCh. 11 - Prob. 31QPCh. 11 - Prob. 32QPCh. 11 - Prob. 33QPCh. 11 - Prob. 34QPCh. 11 - Prob. 35QPCh. 11 - Prob. 36QPCh. 11 - Prob. 37QPCh. 11 - Prob. 38QPCh. 11 - Prob. 40QPCh. 11 - Prob. 41QPCh. 11 - Prob. 42QPCh. 11 - Prob. 43QPCh. 11 - Prob. 44QPCh. 11 - Prob. 45QP
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