Register to reply 
Probability of crossing a point? 
Share this thread: 
#1
Dec3110, 10:17 AM

P: 300

Let's say there is a spider and an ant in a square box. The ant stays in the center of the box. The spider walks a random distance, in a random direction. What are the chances that he will meet the ant?



#2
Dec3110, 02:58 PM

P: 2,501

If you're talking about two geometric points representing the spider and the ant, the probability is 0. If one or both are modeled to occupy a measurable space, the probability is 1 given a finite space and no time limit.



#3
Jan111, 04:59 AM

PF Gold
P: 2,330

The problem doesn't sound welldefined. How many possible directions are there for the spider to walk in? How many possible distances? (If you want to keep things simple, pick a finite number.) Where does the spider start? What is the shape of the path that the spider walks in? I can't agree with SW VandeCarr because, if the spider crawls in a straight line along the inside of the box, it's going to stay in one plane, and if the ant isn't in that plane, the spider can walk forever and never meet the ant.



#4
Jan111, 06:37 AM

P: 2,501

Probability of crossing a point?



Register to reply 
Related Discussions  
What's the point of probability if things go completely against odds?  Precalculus Mathematics Homework  13  
Crossing The Desertwithout hbar  Beyond the Standard Model  28  
Ferry crossing  Introductory Physics Homework  5  
'Crossing Over' ...  Biology  20 