serves a useful purpose (a)tram (b)trap (c)tray . answer me this question?
538272
They each serve a useful purpose in their own way.  It is difficult to pick one over the other because their purposes are so different.  It woul ddepend greatly on the society and culture.  If  your work is driving, tram might be the most important one.  If you are an Inuit hunter and trapper, obviously traps would be most important to you.  If you are a caregiver and need to deliver food to the bedroom of a sick relative everyday, then a tray might be one of your most useful tools.
1092586
Probably "Three Lock Box"
1118096
laboratory apparatus ang its function
621252
a cable that is latched.
402397
I'm assuming this is a multiple choise question.  The answer out of these four is B
373191
Job One:  Secure the borders.  Without that, there's not much point in screwing around with anything else...might as well be rearranging deck chairs on the Titanic...
306191
a) cube...final answer
785206
Holding a door open when you/they are carrying something heavy. \n\nLetting pedestrians cross the road.\n\nSaying please and thank you, simple things like that. \n\nKeeping public toilets clean! (let's face it... everyone moans about dirty public toilets, people not flushing the loos - there must be someone doing it!)
453547
each one has a diferent purpose
230458
To pick up the parts that fall off.
869168
1.(c) 2.(d) 3.(b) 4.(a)
365099
I would just put a mouse trap in my lunch bag.  I think you'll want an alarm the detects light or motion.  If it just detects light then anyone who opens the bag will set off the alarm.  If it detects motion (without using a camera) then anyone who touches it will set it off.  The parts you need will be at Radio Shack.  You'll have to find someone who knows electronics to design the circuit for you.  You should only need about ten parts though.
428124
to go where the food is.
800691
to put in my gun to shoot an intruder\n\nEDIT: OOOOH you meant who would I get in front of and eat lead for....\n\nnobody\n\nI'd disarm the bassard and knock him silly and keep him occupied til the law arrived (if he's lucky)
823846
**** don't worry, size doesn't matter ? even if,  its lenght is less than 3 inches, your purpose will be solved.
333412
Use of beaming for transportation. \n\nWe need something to get rid of this crazy traffic...!
224032
Well, that's the point. A professional thief could take note of if that motion detector alerts authorities, or just "turns on a light" or "makes a noise", and then figure out a "risk verses reward" of how fast it would take the police to respond. however, unless you are likely to have something of value, enough value to cause a thief to go to that kind of trouble, then a motion detector will probably be a good deterrent.