HP-15C The time an object takes to fall to the ground
12-11-2016, 07:01 PM (This post was last modified: 12-11-2016 07:39 PM by Dieter.)
Post: #2
 Dieter Senior Member Posts: 2,397 Joined: Dec 2013
RE: HP-15C The time an object takes to fall to the ground
(12-11-2016 11:49 AM)Gamo Wrote:  According to the User's Manual Page 14 example of the basic programing about
the time an object takes to fall to the ground.

I try to find the exact second from the distance from it.

Second Height (Meter)
1 4.9
2 19.6
3 44.1
4 78.4

The formula is heigth [m] = 4,9 x time[s]^2
Where 4,9 is 1/2 of the well known 9,8 m/s here on earth.

(12-11-2016 11:49 AM)Gamo Wrote:  Percent difference between 4.9 to 19.6 is 300% when add 78.4 + 300% = 313.6

19,6 simply is 4x 4,9. And 313,6 is 4x 78,4.

(12-11-2016 11:49 AM)Gamo Wrote:  313.6 meter using the programed formula equal to 8 second

Sure. If the time doubles, the height changes by a factor of 2² = 4. Or +300%, if you prefer.

Or: if the height quadruples (from 78,4 to 313,6 m) this means that the time changes by a factor of 2, e.g. here from 4 to 8 seconds.

(12-11-2016 11:49 AM)Gamo Wrote:  8 313.6
16 1254
32 5016
64 20064
128 80256

the number in seconds is 8, 16, 32, 64, 128 look like a computer bits numbers.
Just curious and share the though.....

I'm not sure what to want to say with the last table, but it's nothing but simple math. ;-)
If you add 300% to the height, i.e. multiply the height by 4, the corresponding time doubles (=sqrt(4)), as do the listed seconds (8, 16, 32, ...).

Dieter
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 Messages In This Thread HP-15C The time an object takes to fall to the ground - Gamo - 12-11-2016, 11:49 AM RE: HP-15C The time an object takes to fall to the ground - Dieter - 12-11-2016 07:01 PM RE: HP-15C The time an object takes to fall to the ground - Vtile - 12-12-2016, 11:33 AM RE: HP-15C The time an object takes to fall to the ground - Dieter - 12-12-2016, 07:55 PM RE: HP-15C The time an object takes to fall to the ground - Dave Shaffer - 12-21-2016, 08:38 PM RE: HP-15C The time an object takes to fall to the ground - Vtile - 12-21-2016, 10:17 PM RE: HP-15C The time an object takes to fall to the ground - Gamo - 12-21-2016, 04:59 AM

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