Essential University Physics: Volume 2 (3rd Edition)
Essential University Physics: Volume 2 (3rd Edition)
3rd Edition
ISBN: 9780321976420
Author: Richard Wolfson
Publisher: PEARSON
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Chapter 39, Problem 49P
To determine

The diameter of the sun to have expanded to get average density 8.65×1027kgm-3

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what is the rate that sun loose energy by radiation?Given the sun temperature is about 6000k and its radius is 6.95x10^5 kms ( answer shouild be in watts)
In the Sun's core, thermonuclear reactions produce the energy which 2. eventually produces the Sun's luminosity. The Sun's core has a temperature, Tcore 1.6 x 107 K. The mass density of the core is approximately p= 1.5 x 10 kg m3. Assuming the core has the same mass fraction of hydrogen as the Sun's atmosphere (XH = 0.75), approximate the number of fusion reactions between two hydrogen nuclei (two free protons) per second. You may assume that the temperature and density are uniform throughout the core (not realistic!), which extends from the center of the sun out to about Ro/5, and that particles within the core act like a non-relativistic ideal gas (Maxwellian velocity distribution) with all reactions happening at the same relative velocity. Also assume the cross-sectional area for a proton-proton reaction is o = 2.75 x 1048 m2. %3D
Vapor pressure of a pure component (Psat) can be computed from the correlation equations. Beattie et al.(1951) gives the following equation between 50.00 to 160.60 °C for neopentane: 1136.462 log10 pat = 3.901633 + 4.99118 10-4 T T (temperature in K and vapor pressure is in atmospheres). The critical temperature (Te) and critical pressure (Pc) of neopentane are 160.60°C and 31.57 atmospheres respectively. Using the information given above and the class notes, answer the questions #1. 1. The acentric factor w is used a characterization parameter in phase behavior calculations. Acentric factor is a measure of sphericity of a molecule. The definition of w is given below. psat @ =- log10 --1.0 prat is calculated at T/Tc= 0.7 Pc Here Pal is the vapor pressure of the component and, P. and T are critical properties of the component. Psat/P¢and T/Tc must be unitless (T and Tc must be in R or K). Calculate the acentric factor of neopentane (CSH12) using Antoine vapor pressure equation. (In data…
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