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October 2, 2014

Search: Astrophysics

Number of results: 12

astrophysics
If the wavelength of Hydrogen is 21.10611405413 cm, what is the wavelength of oxygen in cm?
March 5, 2011 by james

Astrophysics
If an eclipsing binary system has a period of 32 days, an orbital velocity of 153km/s, and an orbit that is nearly edge-on, what is the circumference of the orbit? The radius of the orbit? The mass of the system? I can't seem to find a starting point for this problem.
July 19, 2010 by Sheena

astrophysics
Mars has a mean density less than the mean density of the Earth's mantle. How is it possible that Mars could have a metallic core given this fact? Hint: No calculations are required. Compare the densities used in part a) with the density of mantle rocks like basalt at one ...
November 26, 2009 by cosmos

Astrophysics
Star Power and Temperature Star A and Star B Consider two stars that are the same size (they have the same diameter), but have different surface temperatures. Letís say Star Aís temperature is 3000 K and Star Bís temperature is 4500 K. Letís look at the ratio of Star Bís ...
October 9, 2012 by Lisa

Astrophysics
You know M(r) = v^2r /G d = distance; s= speed Planet 1: d=2/s=120 Planet 2: d=4/s=60 Planet 3: d=9/s=40 Planet 4: d=16/s=30 Planet 5: d=36/s = 20 You use the distance and orbital speed of the first planet to determine the mass enclosed within the orbit of the first planet to ...
October 29, 2008 by anonymous

Astrophysics
I'm having trouble understanding the formulas for determining a planet's distance and mass. A planet's distance is related to the period of revolution and the mass of the central star (e.g, the sun). The relationship is called Kepler's Third law. Distance can also be ...
September 18, 2006 by Judy

unsolved mysteries astrophysics
Q3.2 COLLAPSE TIMESCALE (5 points possible) Imagine that you live in a distant galaxy far far away. This galaxy is in a different universe, and so may have different cosmology. It seems that in this distant universe, all galaxies have the same luminosity, which you have worked...
April 15, 2014 by JuanPro

Astrophysics
(a) From the absorption lines, we were able to determine that the star (phi)-Fictus has spectral classification F7V and color index B-V=0/48. What is the mass M(phi) of the star in solar masses? (b) Spectroscopic parallax, when corrected for reddening, yields a distance of 4.5...
February 2, 2010 by O_o Rion

Astrophysics
The Earth formed at a redshift of z∼0.53. That means that when our world was young, the universe was quite a bit smaller than it is today. The nearest galaxies to our own are around 10 kpc (kilo-parsecs) in size, lie at a distance of around 1 Mpc from us (Mega-parsecs), ...
April 12, 2014 by Anonymous

astrophysics
1) Every second the Sun outputs 3.90* 10^26 Joules of energy. Power is energy output per unit time and is given in units of Watts (W) where 1 W = 1 Joule per second. The Sun's power output is therefore 3.90*10^26 Watts. This is called the solar luminosity. As this energy ...
November 24, 2009 by Easha

astrophysics
1) Every second the Sun outputs 3.90* 10^26 Joules of energy. Power is energy output per unit time and is given in units of Watts (W) where 1 W = 1 Joule per second. The Sun's power output is therefore 3.90*10^26 Watts. This is called the solar luminosity. As this energy ...
November 24, 2009 by Easha

Physics - solar power in space
Hi, this requires some basic knowledge of astrophysics. I missed last lecture that covered this, so though I'd prefer thorough solutions to these problems, I'd appreciate it even if you could tell me which formulas to use to solve each part of the problem. Thanks! NASAís Mars ...
March 4, 2009 by Mark

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