Yes, by conservation of momentum and relative speed.

Space/Science » in reply to no: conservation of momentum - relative masses.

Yes, by conservation of momentum and relative speed.

Robert Clark — 8/21/2007 6:32:49 PM (archived)

Calculate the speed of impact of a body falling into a red giant star; it's the same as the escape velocity of the star.
Then calculate the velocity imparted to the star by the impact of a planet say of 10 Jovian masses by conservation of momentum.

Bob Clark

The whole thread (29 posts)

From GALEX: Speeding-Bullet Star Leaves Enormous Streak Across Sky - Marcia - 8/15/2007 10:41:23 PM
- Speed due to planetary impacts? - Robert Clark - 8/17/2007 7:50:25 PM
  - no: conservation of momentum - relative masses. (n/t) - alcaray - 8/17/2007 11:12:01 PM
    - Yes, by conservation of momentum and relative speed. - Robert Clark - 8/21/2007 6:32:49 PM
      - No - nick hoffman - 9/9/2007 1:03:35 PM
        
        Yes. - Robert Clark - 9/9/2007 3:07:49 PM
        
        Hey, take two magnets... - nick hoffman - 9/10/2007 12:34:56 PM
        
        Bob, I've got a wonderful machine to sell you - nick hoffman - 9/10/2007 12:02:20 AM
        
        re: Bob, I've got a wonderful machine to sell you - Robert Clark - 9/10/2007 8:33:17 PM
        
        Did you ever see one of those wonderous machines with the big wheel... - alcaray - 9/9/2007 7:00:40 PM
      - to the extent that a body is accelerated by falling into a red dwarf... - alcaray - 8/22/2007 12:06:09 AM
        
        re: to the extent that a body is accelerated by falling into a red dwarf... - Robert Clark - 9/8/2007 2:53:07 PM
        
        escape velocity has nothing to do with it, and again you ignore momentum - alcaray - 9/8/2007 5:49:53 PM
        
        Escape velocity equals the velocity of impact, it's BECAUSE of momentum the star must be imparted with additional velocity. - Robert Clark - 9/8/2007 10:04:48 PM
        
        I'm afraid these guys are right, Robert. - Hank - 9/10/2007 7:31:35 PM
        
        re: I'm afraid these guys are right, Robert. - Robert Clark - 9/11/2007 12:28:44 AM
        
        There's still the question of the energy. - Robert Clark - 9/10/2007 8:27:59 PM
        
        re: There's still the question of the energy. - ER - 9/10/2007 9:49:29 PM
        
        This is basic physics. (n/t) - alcaray - 9/9/2007 6:54:59 PM
        
        re: This is basic physics. - Robert Clark - 9/10/2007 8:29:48 PM
        
        It is canceled by the energy of the red giant rushing towards the gas giant. - alcaray - 9/10/2007 9:00:07 PM
- My local affiliates... - alcaray - 8/16/2007 5:11:54 PM
  - lambda nu equals cee - Hank - 8/22/2007 2:05:55 PM
    - re: lambda nu equals cee. Hank, I don't know what that means, but I also gave your argument some thought. :)_ (n/t) - Marcia - 9/8/2007 8:27:29 PM
      - lambda nu = c - Hank - 9/9/2007 12:36:29 AM
  - re: My local affiliates... - Marcia - 8/17/2007 1:06:33 AM
- re: From GALEX: Speeding-Bullet Star Leaves Enormous Streak Across Sky - Andrew - 8/16/2007 3:58:01 AM
- re: From GALEX: Speeding-Bullet Star Leaves Enormous Streak Across Sky. - Of course a 'bow shock' is seen. (n/t) - Marcia - 8/16/2007 2:05:00 AM
  - And way beyond our galaxy, two galaxy clusters collide... - New Age Vapors - 8/17/2007 2:36:12 AM

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