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Recent Activity

  1. Shivang kohlii posted a new thread.

    Equation of shm for different positions

    1. The problem statement, all variables and given/known data Write the equation for a particle in simple harmonic motion with amplitude...

    Forum: Introductory Physics Homework

    Mar 22, 2019 at 9:12 PM
  2. quinoa19 replied to the thread Force and Impulse on Railway Locomotion.

    [SPOILER]

    Mar 22, 2019 at 9:11 PM
  3. Nik_2213 replied to the thread Is 'Airwolf' possible with our current technology? (Supersonic Helicopter).

    "Harrier isn't supersonic but close." It could have been: I used to know the guy who led the team that solved the supersonic Pegasus'...

    Mar 22, 2019 at 9:10 PM
  4. sysprog replied to the thread C# method question.

    /* ##\mathtt{You\ can\ use\ } \TeX \mathtt{\ to\ show}\ \textbf{bold},\ \underline{\mathtt{underline}},\ \text{and } \textit{italic}...

    Mar 22, 2019 at 9:04 PM
  5. Sarxas liked DennisN's post in the thread Our Beautiful Universe - Photos and Videos.

    Wow! "I took nearly 50,000 images of the night sky to make an 81 Megapixel image of Tuesday's moon. Uncompressed image linked in the...

    d1aehdnbq0h21.jpg Mar 22, 2019 at 9:02 PM
  6. Sarxas liked DennisN's post in the thread Our Beautiful Universe - Photos and Videos.

    This thread is dedicated to the beauty and awesomeness of our Universe. If you feel like it, please share video clips and photos (or...

    Mar 22, 2019 at 9:02 PM
  7. jbriggs444 replied to the thread How to find the energy of an object that was at rest?.

    The kinetic energy of the moving rocket has increased by 4%. That does not mean that its momentum has increased by 4%. You had already...

    Mar 22, 2019 at 9:01 PM
  8. berkeman replied to the thread Job Skills What activities can a student do to stand out?.

    We're using code words now... [MEDIA]

    Mar 22, 2019 at 9:01 PM
  9. Sarxas posted a new thread.

    Music of the Cosmos

    What is your favorite science fiction, fantasy, and or cosmic-themed music? I'll kick it off with the new Haiduk album - 'Exomancer'....

    Forum: Science Fiction and Fantasy Media

    Mar 22, 2019 at 9:00 PM
  10. phyzguy replied to the thread I Maxwell's calculations on electromagnetism's speed = light speed.

    One way to see the difference is to realize that the constants you called Ke and Km in your original post are related to ε0 and μ0 by:...

    Mar 22, 2019 at 8:56 PM
  11. ozni replied to the thread Force and Impulse on Railway Locomotion.

    They are subjected to the same pulse when joined together as they were when they were not joined together. I just cant seem to relate it...

    Mar 22, 2019 at 8:50 PM
  12. phyzguy attached a file to the thread B Is there a standard mapping of celestial coordinates to geo-coordinates.

    Well, you could try overlaying these two. I think they are both Mollweide projections centered on (0,0) [ATTACH] [ATTACH]

    Mollweide_Earth.png Mollweide_Celestial.png Mar 22, 2019 at 8:47 PM
  13. berkeman replied to the thread B Is there a standard mapping of celestial coordinates to geo-coordinates.

    Welcome to the PF. :smile: I did a Google search on Constellation Coordinates and got lots of hits. Does this hit list help?...

    Mar 22, 2019 at 8:47 PM
  14. Sarxas has a new avatar.

    Mar 22, 2019 at 8:45 PM
  15. jbriggs444 replied to the thread B Time dilation and Einstein's theorem.

    It is far from clear what measurements you are describing here. The unambiguous fact of the matter is that the clock held by the...

    Mar 22, 2019 at 8:43 PM
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