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by y_utsumi
May 7th, 2017, 6:18 am
Forum: 2017 Study Events
Topic: Astronomy C
Replies: 169
Views: 41003

Re: Astronomy C

Can someone help me out with this problem? Given the following light curve (http://zebu.uoregon.edu/images/sn94d.gif) of a typical Type Ia supernova in several different regions of the EM spectrum, estimate the redshift of the supernova. Here's my work: M=m-5*log(r/10) -19.3=12-5*log(r/10) r=18.197 ...
by y_utsumi
February 10th, 2017, 10:29 am
Forum: 2017 Study Events
Topic: Astronomy C
Replies: 169
Views: 41003

Re: Astronomy C

What is the difference among the 3 variants of Kepler's Law? They all produce different answers..

1. p^2 = a^3

2. p^2 = (4 pi^2 a^3) / (GM_total)

3. M_total = a^3 / p^2
by y_utsumi
February 4th, 2017, 12:59 pm
Forum: 2017 Lab Events
Topic: Optics B/C
Replies: 190
Views: 28477

Re: Optics B/C

If a thin lens question says, "an object is located at x = +31cm...its image is located at x = -12cm," does that mean image is located at -12cm relative to the object (and therefore di = +12cm)? or does that mean di = -12cm?
by y_utsumi
January 20th, 2017, 8:45 am
Forum: 2017 Study Events
Topic: Astronomy C
Replies: 169
Views: 41003

Re: Astronomy C

Need help with these questions: 1) The image attached shows a Mira variable star: Chi Cygni. The first cycle shows the apparent magnitude change from ~3.0 to ~ 14.0. How many times brighter is Chi Cygni at the top of the cycle than the bottom of the cycle? I tried using L_A/L_B=2.512^(M_B-M_A) but g...
by y_utsumi
December 12th, 2016, 3:21 pm
Forum: 2017 Study Events
Topic: Astronomy C
Replies: 169
Views: 41003

Re: Astronomy C

How can this be solved? I know it has to do with Kepler's laws, but I keep getting a very large answer.. Suppose that the mass of Sirius B is 0.98 solar masses, and the semi-major axis between Sirius A is 7.5 arcsec observed from Earth, and that we are viewing the system face-on. Calculate the peri...
by y_utsumi
December 12th, 2016, 2:01 pm
Forum: 2017 Study Events
Topic: Astronomy C
Replies: 169
Views: 41003

Re: Astronomy C

How can this be solved? I know it has to do with Kepler's laws, but I keep getting a very large answer.. Suppose that the mass of Sirius B is 0.98 solar masses, and the semi-major axis between Sirius A is 7.5 arcsec observed from Earth, and that we are viewing the system face-on. Calculate the perio...

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