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04-08-2007, 06:48 PM
| #1 (permalink) | |
| Retired.  Join Date: Dec 2005 Location: Los Angeles, California
Posts: 8,148
 |  physics problem Here a physics problem that came to my mind. If somebody thats just standing and he leaps into the air straight up and falls down to the same spot where he jumped, how high did he reach if the jumping and falling took .91 seconds?
__________________  My computer uses 1.5A-load, .8A-idle, .65A-standby, .05A-turned off on 125V. "The spaces between your fingers were created so that another's could fill them in." Quote:
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04-08-2007, 07:14 PM
| #2 (permalink) |
| Super Techie  Join Date: Oct 2005
Posts: 465
| Re: physics problem so assuming i did this right, he reaches a height of 1.01442m. That assuming no wind resistance, earth's gravity, and ignoring earth's rotation (if he jumps straight up, he'll land at a different spot since earth is rotating). |
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04-08-2007, 07:33 PM
| #3 (permalink) | |
| Retired. Join Date: Dec 2005 Location: Los Angeles, California
Posts: 8,148
| Re: physics problem how did you get to that answer?
__________________ My computer uses 1.5A-load, .8A-idle, .65A-standby, .05A-turned off on 125V. "The spaces between your fingers were created so that another's could fill them in." Quote:
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04-08-2007, 07:36 PM
| #5 (permalink) | |
| Retired. Join Date: Dec 2005 Location: Los Angeles, California
Posts: 8,148
| Re: physics problem its about 40 inches
__________________ My computer uses 1.5A-load, .8A-idle, .65A-standby, .05A-turned off on 125V. "The spaces between your fingers were created so that another's could fill them in." Quote:
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04-08-2007, 07:45 PM
| #6 (permalink) |
| Super Techie Join Date: Oct 2005
Posts: 465
| Re: physics problem 40in * .0254m/in = 1.01600m ~=1.01442m it was pretty easy. (using metric units) we know that g = 9.8m/s^2 and we know that the time going up is the same as the time going down. So I just integrated twice to get displacement over half of the .91 seconds. it all comes down to this: a = dv/dt = d^2x/dt^2, where a = acceleration v = velocity x = displacement |
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04-10-2007, 02:13 AM
| #7 (permalink) |
| Super Moderator  Join Date: May 2005 Location: Locked in a dungeon, Perth
Posts: 7,778
| Re: physics problem seems right to me. peterhuang, why would you use anything but SI units for physics?
__________________ Get FireFox Saxon's Blog|Saxon's Forum - CHECK IT OUT! Fold for tech forums. MY COMPUTER HELPS CURE CANCER! "Sniffing Powdered Ubuntu CDs Cures Cancer!" - TuxMachines.org /Q6600@3.0GHz/2x1GB Kingston DDR2-800/Gigabyte P35-DS3R/XFX 7900GS 256MB/Antec TPII 480w/2x250gb+80gb WD Caviar/WinFast DTV-1000T/TT Soprano/ I'm sorry but I do not accept support requests via IM, email, or personal messages You can contact me for Forum related issues via PM only.  |
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04-10-2007, 02:18 AM
| #8 (permalink) |
| Multicellular Eukaryote  Join Date: Jun 2003 Location: Melbourne, Australia
Posts: 12,528
| Re: physics problem It's also assuming his feet are always in exactly the same position relative to the rest of his body. *edit* Nitestick, update your signature! you are now in the folding@home 20k club! I'm just a shave off 20k myself. I've prepared my sig image in advance.
__________________  1 + 1 = 3 if you define 3 as a result of 1 + 1 Last edited by Apokalipse; 04-10-2007 at 02:22 AM. |
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04-10-2007, 02:30 AM
| #9 (permalink) |
| Super Moderator Join Date: May 2005 Location: Locked in a dungeon, Perth
Posts: 7,778
| Re: physics problem yeah i noticed a few days ago but i've been too lazy to 'chop a new one 
__________________ Get FireFox Saxon's Blog|Saxon's Forum - CHECK IT OUT! Fold for tech forums. MY COMPUTER HELPS CURE CANCER! "Sniffing Powdered Ubuntu CDs Cures Cancer!" - TuxMachines.org /Q6600@3.0GHz/2x1GB Kingston DDR2-800/Gigabyte P35-DS3R/XFX 7900GS 256MB/Antec TPII 480w/2x250gb+80gb WD Caviar/WinFast DTV-1000T/TT Soprano/ I'm sorry but I do not accept support requests via IM, email, or personal messages You can contact me for Forum related issues via PM only. |
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