Physics

3365 topics in this forum

1. Does aluminum foil block x-rays?

   By greree, June 2, 2009
   • 10 replies
   • 114585 views
   • 
   • uranium238
   • May 25, 2010

2. Calculating mixed water temperature

   By kybert, February 13, 2006
   • 17 replies
   • 76920 views
   • 
   • knyazik
   • October 22, 2014

3. Why does wet cold air feel so much colder than dry cold air? 1 2

   By CaptainPanic, July 25, 2008
   • 36 replies
   • 74167 views
   • 
   • J.C.MacSwell
   • October 25, 2014

4. A piece of metal under the hot sun...

   By Externet, September 22, 2008
   • 15 replies
   • 70988 views
   • 
   • swansont
   • September 26, 2008

5. What materials can X-Rays not pass through?

   By bridgey, April 17, 2006
   • 17 replies
   • 65043 views
   • 
   • Bill Angel
   • July 10, 2015

6. Resistance of capacitor 1 2 3

   By Primarygun, May 9, 2007
   • 59 replies
   • 63645 views
   • 
   • Mike Smith Cosmos
   • November 16, 2014

7. Best material to absorb heat and then slowly radiate that heat

   By parsson, October 17, 2013
   • 5 replies
   • 61826 views
   • 
   • DaMeatMan
   • January 11, 2014

8. Problem with Carbon 14 radiometric dating

   By Griffon, December 29, 2008
   • 17 replies
   • 56363 views
   • 
   • Ophiolite
   • February 17, 2016

9. Why an Airplane Flies (Bernoulli's Principle vs. Newton's Third Law) 1 2 3 4 9

   By antimatter, July 14, 2008
   • 206 replies
   • 51220 views
   • 
   • imatfaal
   • December 9, 2014

10. questions about dark matter 1 2

    By boo, September 18, 2019
    • 33 replies
    • 46889 views
    • 
    • Janus
    • October 19, 2019

11. Materials with a high heat retention

    By mhasson, May 16, 2011
    • 14 replies
    • 46453 views
    • 
    • Enthalpy
    • August 25, 2012

12. Unanswered questions

    By paragaster, January 23, 2017
    • 7 replies
    • 42106 views
    • 
    • J.C.MacSwell
    • February 3, 2017

13. Paper tower! Not easy!

    By grayfalcon89, September 3, 2007
    • 18 replies
    • 40393 views
    • 
    • iNow
    • September 8, 2007

14. surviving free fall into the water from high altitude 1 2

    By Comandante, June 4, 2010
    • 31 replies
    • 40170 views
    • 
    • taeto
    • October 7, 2018

15. Why does mass curve space-time? 1 2 3 4 8

    By Incendia, November 21, 2010
    • 194 replies
    • 37697 views
    • 
    • TheGeckomancer
    • December 1, 2015

16. is voltage directly proportional to current? [Answered: YES]

    By paul, December 2, 2008
    • 3 replies
    • 36389 views
    • 
    • swansont
    • December 2, 2008

17. What is time? (Again) 1 2 3 4 9

    By The victorious truther, July 11
    • 224 replies
    • 32701 views
    • 
    • michel123456
    • 16 hours ago

18. Help With egg launcher

    By lerix, May 20, 2006
    • 5 replies
    • 32418 views
    • 
    • CaptainPanic
    • January 25, 2008

19. Diamond sword that can cut through anything? 1 2

    By Hypercube, December 2, 2011
    • 29 replies
    • 30042 views
    • 
    • M>stic_InC
    • November 9, 2017

20. The meter-second (moved from general discussion)

    By zebov, February 10, 2006
    • 24 replies
    • 29689 views
    • 
    • JamesPT
    • January 21

21. Magnetic Bullet Shield 1 2

    By Iruka, September 30, 2007
    • 34 replies
    • 29272 views
    • 
    • morgsboi
    • March 1, 2012

22. Will entropy be low much of the time? 1 2

    By Tristan L, May 31
    • 25 replies
    • 28225 views
    • 
    • Tristan L
    • June 4

23. Ethanol weight percentage -> volume percentage

    By CaptainPanic, July 2, 2008
    • 6 replies
    • 27852 views
    • 
    • CaptainPanic
    • July 14, 2008

24. Rotational and inertial mechanics, overunity mechanism? 1 2 3 4

    By Seanie, September 27, 2019
    • 90 replies
    • 27282 views
    • 
    • swansont
    • October 5, 2019

25. Is BArGaIn theory a fantasy????

    By sandund, October 12, 2011
    • 9 replies
    • 27233 views
    • 
    • John Cuthber
    • November 25, 2013