Math Fun! - DPChallenge Forums

04/09/2007 08:13:02 PM · #1

ok, lets see if you guys are really as smart as you think you are ;)

1. a person snaps his fingers. One minute later he snaps them again. He then waits 2 minutes before the next snap, and 4 minutes for the following snap. The he waits 8 minutes. He continues in this manner, each time doubling the time internal between snaps. How much will elapse by the 100th snap?

2. a goat is tied at a corner of a 20m x 40m barn with a 50m rope. If it can graze at any spot outside of the barn to which its rope can reach, what is the size of its grazing area?

I'm gonna keep adding more questions as i get to them...so dont be afraid to re-visit the thread every couple fo minutes.

-Dan

Message edited by author 2007-04-09 20:41:38.

DjFenzl

04/09/2007 08:14:45 PM · #2

studying binary?

and I believe the answer would be 2 to the 100th so...
1.2676506 Ã� 10 to the 30th

or
1267650600000000000000000000000 minutes

or
21127510000000000000000000000 hours

or
880312916666666666666666667 days

or
2408516871865025079799362 years

Message edited by author 2007-04-09 20:24:51.

Canon EF 24-105mm f/4.0L IS

04/09/2007 08:15:33 PM · #3

Originally posted by Megatherian:

studying binary?

nope...studying math 4 :D

Art Roflmao

Canon EOS-6D Mark II

04/09/2007 08:15:49 PM · #4

I'm not smarter than a 5th grader. :(

MattO

Nikon D4

Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II

04/09/2007 08:30:12 PM · #5

1267650600228229401496703205376 minutes at 100 snaps.

What do I win.

MattO

jackal9

Canon EOS-50D

04/09/2007 08:30:45 PM · #6

Originally posted by Megatherian:

Wouldn't it actually be the SUM of the geometric progession 2 to the 100th plus 1?, or actually a geometric series?? and for the life of me I don't remember how to solve a series or progression anymore so I guess I'll just shut up now, LOL.

Canon EF 100mm f/2.8 USM Macro

04/09/2007 08:39:28 PM · #7

hmm... i thought it was 2^99

Spork99

OM System OM-1

04/09/2007 08:39:35 PM · #8

Originally posted by jackal9:

Originally posted by Megatherian:
studying binary?

and I believe the answer would be 2 to the 100th so...
1.2676506 Ã� 10 to the 30th

or
1267650600000000000000000000000 minutes

or
21127510000000000000000000000 hours

or
880312916666666666666666667 days

or
2408516871865025079799362 years

Wouldn't it actually be the SUM of the geometric progession 2 to the 100th plus 1?, or actually a geometric series?? and for the life of me I don't remember how to solve a series or progression anymore so I guess I'll just shut up now, LOL.

That would be the total time spent waiting between all snaps

04/09/2007 08:42:52 PM · #9

Should be 2^99.

Edit....hmm - unless the very first snap is counted. Then it is 2^98.

first snap
second snap - 2^0
third - 2^1
fourth - 2^2

Message edited by author 2007-04-09 20:46:39.

DjFenzl

04/09/2007 08:48:46 PM · #10

I was just guessing.

Math is hard.

04/09/2007 08:50:09 PM · #11

I'm just being a geek.

And I am probably wrong. :D

TCGuru

Canon EOS-40D

04/09/2007 08:50:16 PM · #12

I got 63,382,530,011,411,470,748,351,602,688 Minutes

How wrong is that?? LOL

ETA: I graphed it

Message edited by author 2007-04-09 20:50:39.

04/09/2007 08:54:11 PM · #13

i no longer feel as geeky :D hehe

TCGuru

Canon EOS-40D

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

04/09/2007 08:55:25 PM · #14

Originally posted by colorcarnival:

i no longer feel as geeky :D hehe

Me either and I was so glad to see your name up there LOL

SDW

Canon EOS-60D

04/09/2007 08:55:47 PM · #15

633825300114115000000000000000 minutes
or
10563755001901900000000000000 hours
or
440156458412580000000000000 days
or
1205908105239940000000000 years

04/09/2007 08:57:01 PM · #16

Maybe we should start a WPL team for geeks. Stun everyone with our sheer brilliance.

ha

lol

kawana

Sony Alpha a7R

Samyang 135mm f/2 ED UMC

04/09/2007 09:03:44 PM · #17

The answer to both is..

PurpleÂ³

Feel free to stare at me in wonder :)

Message edited by author 2007-04-09 21:04:24.

TCGuru

Canon EOS-40D

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

04/09/2007 09:10:57 PM · #18

Originally posted by kawana:

The answer to both is..

PurpleÂ³

Feel free to stare at me in wonder :)

::::Jojo stares in wonder::::

So, when do we get the answer??

SDW

Canon EOS-60D

04/09/2007 09:11:48 PM · #19

Step 1
A = 3.14 x (50m Â· 50m)
A = 3.14 x (2500m)
A = 7850
Step 2
Since the barn is a rectangle it is tied to a 90 deg angle so the area must by be reduced because a 1/4 of the area is inside the barn.

A= 7850m x 3/4
A= 5887.5m

Message edited by author 2007-04-09 21:16:50.

04/09/2007 09:15:44 PM · #20

are we doing your homework? cuz that's not cool...

kawana

Sony Alpha a7R

Samyang 135mm f/2 ED UMC

04/09/2007 09:16:59 PM · #21

Originally posted by colorcarnival:

are we doing your homework? cuz that's not cool...

But doing other peoples homework makes YOU cool!

04/09/2007 09:26:23 PM · #22

Originally posted by colorcarnival:

are we doing your homework? cuz that's not cool...

nope :) just some extra little things my teacher gave us... the actual homework was much easier

Message edited by author 2007-04-09 21:27:56.

04/09/2007 09:27:34 PM · #23

Originally posted by swhiddon:

yeah, but happens when the rope goes around the corner, i solved it where it was 3/4 the 50 radius circle and 1/4 each of a 10 radius and 30 radiud circle for the two corners it bent around

Man_Called_Horse

Canon EOS-300D Rebel

04/09/2007 09:28:47 PM · #24

Originally posted by Art Roflmao:

I'm not smarter than a 5th grader. :(

Aye only gradetated five grade.

jackal9

Canon EOS-50D