1. Re: bullet code (was ICONS - dead horse)
- Posted by George Walters <gwalters at SC.RR.COM> Feb 07, 2000
- 360 views
- Last edited Feb 08, 2000
David, the example you gave the velocity is straight up at 1000 ft/sec. Gravity is slowing it down at 32ft/sec each second, so after one second the height above the ground would be: y = 1000 * 1 - .5 *32* 1* 1 = 984 ft high... which would be correct. Gravity only would change it's velocity 32ft/sec each second. It would then take 1000/32 seconds for it to be stopped.. somewhere up in the air. 1000 feet/sec is quite fast (sound is approx 780 ft/sec).. so your bullet would go quite far upwards (neglicting air drag). You could figure how high it would go by using.... V = SQRT(2*G*H) or solving for H H = V*V / G and your example this would be 31,250 feet... which is neglicting air drag which is quite subtantial at super sonic speeds. So the 31,250 would be quite unrealistic. .. george -----Original Message----- From: George Walters <gwalters at SC.RR.COM> To: EUPHORIA at LISTSERV.MUOHIO.EDU <EUPHORIA at LISTSERV.MUOHIO.EDU> Date: Monday, February 07, 2000 8:27 PM Subject: Re: bullet code (was ICONS - dead horse) >you forgot 'G', it's 32ft/sec/sec > > >-----Original Message----- >From: David Roach <roachd_76 at YAHOO.COM> >To: EUPHORIA at LISTSERV.MUOHIO.EDU <EUPHORIA at LISTSERV.MUOHIO.EDU> >Date: Monday, February 07, 2000 8:23 PM >Subject: Re: bullet code (was ICONS - dead horse) > > >>Let's take your equation y = vy * t - .5 * t * t and let's add some >>numbers. >>velocity = 1000f/s >>time = 1 second >> >>y = 1000f/s * 1s - .5 * 1s^2 >>y = 1000f - .5s >>y = 999.5 f >> >>I just can't believe that anything will fall 999.5 feet in one second. >>Plus velocity and gravity are independent of each other. >>Could someone please clue us in to what we are talking about. >> >>roachd_76 >>George Walters <gwalters at SC.RR.COM> wrote: >> >>>Here are the correct equations: >>> >>>X = X0 + VX * T >>> >>>Y=Y0 +VY * T - .5G * T * T >>> >>>VX = V* COS(ANGLE) >>> >>>VY = V * SIN( ANGLE) >>> >>>V = initial velocity at some angle above the ground >>>X0 AND Y0 are initial positions and could be zero >>> >>>..george >>>