White Dwarfs and Neutron Stars. Recall that density is mass divided by volume, and consult Appendix B as needed, (a) Calculate the average density of the earth in g/cm 3 . Assuming our planet is a perfect sphere, (b) In about 5 billion years, at the end of its lifetime, our sun will end up as a white dwarf that has about the same mass as it does now but is reduced to about 15,000 km in diameter. What will be its density at that stage? (c) A neutron star is the remnant of certain supernovae (explosions of giant stars). Typically, neutron stars are about 20 km in diameter and have about the same mass as our sun. What is a typical neutron star density in g/cm 3 ?
White Dwarfs and Neutron Stars. Recall that density is mass divided by volume, and consult Appendix B as needed, (a) Calculate the average density of the earth in g/cm 3 . Assuming our planet is a perfect sphere, (b) In about 5 billion years, at the end of its lifetime, our sun will end up as a white dwarf that has about the same mass as it does now but is reduced to about 15,000 km in diameter. What will be its density at that stage? (c) A neutron star is the remnant of certain supernovae (explosions of giant stars). Typically, neutron stars are about 20 km in diameter and have about the same mass as our sun. What is a typical neutron star density in g/cm 3 ?
White Dwarfs and Neutron Stars. Recall that density is mass divided by volume, and consult Appendix B as needed, (a) Calculate the average density of the earth in g/cm3. Assuming our planet is a perfect sphere, (b) In about 5 billion years, at the end of its lifetime, our sun will end up as a white dwarf that has about the same mass as it does now but is reduced to about 15,000 km in diameter. What will be its density at that stage? (c) A neutron star is the remnant of certain supernovae (explosions of giant stars). Typically, neutron stars are about 20 km in diameter and have about the same mass as our sun. What is a typical neutron star density in g/cm3?
One mole of Gold (Au) atom has a mass of 197 g. We know that the density of gold is 19.30 g/cm3 in room temperature. Using those numbers, answer the following questions:
a) What is the mass of a single gold atom in kg?
b) Assume that gold atoms sit in a perfect cubic crystal structure. Estimate the distance between two gold atoms in meters.
c) If we have a gold cube of 6 cm on each side, how many atoms can we fit along the edge of each side of the cube?
d) What would be the mass, in kilograms, of the gold cube we discussed in part (c) (measuring 6 cm on each side)?
The density of the Earth can be expressed by the equation density = C{1.22 -(r/R)}, where R is the radius of the Earth and C is a constant. Find the expression for C in terms of total mass (M) and the radius (R)..
We are going to make a simple approximation of the number of atoms in the universe.
Assume all the atoms in the universe are hydrogen. (In actual practice, over 75% of the atoms in the universe are hydrogen.)
Assume the sun is a typical star (made of pure hydrogen) has a density of 1.4 g/cm3 and is a sphere with a radius of 7.0*108m
Assume that there are 100 billion stars in our Milky Way galaxy that are identical to our sun.
Assume that there are 10 billion galaxies in the universe identical to our Milky Way galaxy. How many atoms are there in the universe?
Chapter 1 Solutions
University Physics, Volume 2 - Technology Update Custom Edition for Texas A&M - College Station, 2/e
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Physics CH 0: General Introduction (14 of 20) How to Estimate Number of Teachers in US; Author: Michel van Biezen;https://www.youtube.com/watch?v=GBv_JLUzM-M;License: Standard Youtube License