Math Is Fun Forum

G-man

Member

Registered: 2011-02-28

Posts: 16

When will bomb explode?

Someone planted a bomb that will surely explode. Logically people will say that the bomb has far higher chances of explosion within an hour after planting compared to an hour 10 years later (if it didn't explode before). What does maths say about this.

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Maths!......

sameer mishra

Member

Registered: 2010-08-27

Posts: 64

Re: When will bomb explode?

when material inside bomb burn then burning material creats fume inside it then by this process a situation occur when pressure inside is greater than atmosphetric pressure so it explode in many small part now small parts are aso exploded this process occur on the microscopic label

Bob

Administrator

Registered: 2010-06-20

Posts: 10,623

Re: When will bomb explode?

hi G-man

Have I got this right?  You are saying it must explode but at a random moment.

Then it depends on what 'a random moment' really means.

eg.  If there's an equal chance of explosion some time between now and the heat death of the universe, then an hour picked at any time will have equal probability.

but if eg.  the probability decreases at an exponential rate, then an hour now is a much higher risk than an hour later.

It all depends on the rules for the probabilities and you haven't said what they are.

Even knowing it hasn't exploded yet is no help if you don't know the probability density function

eg.  If it has a built in delay that means it won't go off during the first 10 years ......

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob