# Wibo

### Hubble Age of the Universe?

Compute the Hubble age of the universe assuming H = 75 km/s/Mpc.

I think I have to use the equation: v = H0d.

Do I just solve for d?

Thanks!

4 AnswersAstronomy & Space9 months ago### Min./Max. Mass of Stars?

Why is there a minimum and a maximum mass that a star can have? Roughly what

are the minimum and maximum masses?

8 AnswersAstronomy & Space10 months ago### What's a good laptop for coding?

Hello, I'm looking to buy a laptop for school. I primarily want it for Python coding but I also want a decent one for programs such as Matlab, Maple, and other programs I may be required to download. What would be a good laptop for these? My budget is around $500 and any guidance is appreciated.

Thank you.

1 AnswerProgramming & Design1 year ago### Hasse Diagram Question?

Let S = Natural Numbers,. and let R be the "divides" relation. Draw the Hasse diagram for the interval poset [4,400].

I know 4 goes at the bottom and 400 at the top but I don't know how I should divide it or how many numbers I should have in the diagram.

Any help would be appreciated, thanks.

1 AnswerMathematics2 years ago### Seasons and Tilt of the Earth?

If the tilt of the Earth s axis were 90 degrees, would we still have four seasons? And would the changes between summer and winter be more extreme?

7 AnswersAstronomy & Space3 years ago### Star Formation?

If the star formation process didn't include magnetic fields, would the Sun's rotation rate be any different from what it is now?

2 AnswersAstronomy & Space3 years ago### Cosmic Recycling?

If stars had no wind and they never "exploded" in any way, would there be more, less, or the same amount of life on Earth?

5 AnswersAstronomy & Space3 years ago### Limb Darkening?

If the core of the Sun were cool and the surface very hot, would we see limb brightening instead of limb darkening?

2 AnswersAstronomy & Space3 years ago### What is this word called?

I can't remember the exact definition but it's something like:

"If you are born into this, then you are this."

For example,

"You are christian because you were born into a christian family."

Can't think of other examples.

3 AnswersWords & Wordplay4 years ago### Tips for a Math Major?

I recently decided to major in Mathematics (and astronomy) and I'm looking for any tips or advice or material that will help me in my studies. I'm about to go on vacation and I want to spend my break studying some math.

Any websites I should know about?

Any books/Magazines I should read?

Places I should visit? (I live in SD, CA)

Etc.

Anything at all is much appreciated. Thanks!

1 AnswerMathematics4 years ago### Tips for an Astronomy Student?

I recently decided to major in Astronomy (and math) and I'm looking for any tips or advice or material that will help me in my studies. I'm about to go on vacation and I want to spend my break studying some astronomy.

Any websites I should know about?

Any books/Magazines I should read?

Places I should visit? (I live in SD, CA)

Etc.

Anything at all is much appreciated. Thanks!

Astronomy & Space4 years ago### Linear Algebra Orthonormal Basis?

Need some help with this problem:

Find an orthonormal basis of the plane

x1-8x2-x3=0

I know you have to choose two points on the plane and then do the Gram-Schmidt process right? I made

v1=[1,-8,-1] and v2=[1,0,1]

The magnitude of v1=sqrt(66)

so when I multiplied (v1)(1/sqrt(66)) to find the first basis I got

[1/sqrt(66),-8/sqrt(66),-1/sqrt(66)]

But this wasn't right. What am I doing wrong?

1 AnswerMathematics4 years ago### Linear Algebra?

I just had a test for linear algebra and I don't remember the problem exactly but we were given this equation and we had to turn it into a 3x3 matrix and find the image and the kernel. The equation was:

x+3y+5z=0

I know how to find the image and the kernel but how do I make this into a 3x3 matrix? Can't get this question out of my head it's the only one I missed.

Thanks!

1 AnswerEngineering4 years ago### Linear Algebra?

I just had a test for linear algebra and I don't remember the problem exactly but we were given this equation and we had to turn it into a 3x3 matrix and find the image and the kernel. The equation was:

x+3y+5z=0

I know how to find the image and the kernel but how do I make this into a 3x3 matrix? Can't get this question out of my head it's the only one I missed.

Thanks!

1 AnswerMathematics4 years ago### Is it weird if I take my mom to a wedding?

I'm going to a wedding and I don't have anyone to go with but I already said I was bringing a guest. Would it be weird to take my mom with me or should I just go alone?

Weddings4 years ago### Age of the Universe?

One way to estimate the distance to a cluster is to assume that the brightest galaxies in each cluster have the same absolute magnitude. If galaxies get fainter with time, we would be underestimating the distance to the more distant clusters of galaxies. How would that affect our estimate for the age of the universe?

5 AnswersAstronomy & Space4 years ago### Age of the Universe?

If galaxies were slowing with time, how would that affect the Hubble constant and our estimate for the age of the universe?

1 AnswerAstronomy & Space4 years ago### Distance Modulus?

If the distance modulus is m - M = 5 (log r) - 5, where m = 5.11 and M = -0.5, how do I solve for r?

1 AnswerAstronomy & Space4 years ago### Absolute Magnitude?

What is the absolute magnitude of beta Cygni, epsilon Tauri, 61 Virginis, and 22 Tauri?

Astronomy & Space4 years ago### Absolute Max/Min?

What are the absolute maximum and minimum values of f(t) = 2cost+sin(2t), [0,π/2] ?

2 AnswersMathematics4 years ago