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Title: The water molecules now in your body were once part of a molecular cloud. Post by: moldylime on Apr 17, 2012 Working through the online assignments. I'll post the ones I don't get. I hope you guys can help.
PB 16.48 The water molecules now in your body were once part of a molecular cloud. Only about onemillionth of the mass of a molecular cloud is in the form of water molecules, and the mass density of such a cloud is roughly 4.0×10?21 Estimate the volume of a piece of molecular cloud that has the same amount of water as your body. a. 1.0×1029 cm^3 b 1.0×1031 cm^3 c 1.0×1033 cm^3 d 1.0×1035 cm^3 Title: The water molecules now in your body were once part of a molecular cloud. Post by: moldylime on Apr 17, 2012 Pb 16.50 Isolated molecular clouds can have a temperature as low as 12 and a particle density as great as 1.20×105 particles per cubic centimeter.
What is the minimum mass that a cloud with these properties needs in order to form a star? In solar masses Title: The water molecules now in your body were once part of a molecular cloud. Post by: moldylime on Apr 17, 2012 Pb 16.52 The Sun is essentially a gas cloud in which the forces of pressure and gravity balance each other.We can therefore use the equation in Mathematical Insight Gravity Versus Pressure in the textbook to estimate the interior temperature of the Sun from its mass and particle density.
What is the average number density of particles within the Sun, given that the average mass per particle is about gram? in particles / cm ^3 Title: The water molecules now in your body were once part of a molecular cloud. Post by: chemb on Apr 17, 2012 Pb 16.52 The Sun is essentially a gas cloud in which the forces of pressure and gravity balance each other.We can therefore use the equation in Mathematical Insight Gravity Versus Pressure in the textbook to estimate the interior temperature of the Sun from its mass and particle density. What is the average number density of particles within the Sun, given that the average mass per particle is about gram? in particles / cm ^3 One question per thread... I will help answer this one for you though --> density = mass/volume the density of the sun is solar mass/(4/3 pi r^3) where r is the radius of he sun (the volume of a sphere is 4.3 pi r^3) M sun=2x10^33kg r sun = 6.96x10^10 cm so density of sun = 2x10^33g/(4/3 pi x (6.96x10^10)^3) density = 1.4 g/cm^3 or about 1.4 times the density of water since each particle has a mass of 10^(-24) g, this mass density equates to a number density of 1.4 g/cm^3 x 1 particle/10^(-24g)=1.4x10^24 particles/cm^3 Title: The water molecules now in your body were once part of a molecular cloud. Post by: moldylime on Apr 17, 2012 Thanks :)
Title: The water molecules now in your body were once part of a molecular cloud. Post by: chemb on Apr 17, 2012 Title: The water molecules now in your body were once part of a molecular cloud. Post by: moldylime on Apr 17, 2012 No, still haven't figured them out.
Title: The water molecules now in your body were once part of a molecular cloud. Post by: ppk on Apr 17, 2012 Pb 16.50 Isolated molecular clouds can have a temperature as low as 12 and a particle density as great as 1.20×105 particles per cubic centimeter. What is the minimum mass that a cloud with these properties needs in order to form a star? In solar masses Use Jeans Mass equation... (http://upload.wikimedia.org/wikipedia/en/math/1/9/0/19026e66d240c26718793fe2474bcbcf.png) where n is the particle number density, m is the mass of the 'average' gas particle in the cloud, T is the gas temperature, and the "k" is the Boltzmanns constant. Title: The water molecules now in your body were once part of a molecular cloud. Post by: dannydieguez on Sep 19, 2012 thank you
Title: The water molecules now in your body were once part of a molecular cloud. Post by: jcs on Nov 4, 2012 Great!
Title: The water molecules now in your body were once part of a molecular cloud. Post by: tfr on Jan 22, 2013 This is great help and recommand to all users to look over these answers for helping them on a final exam
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