And another... - SV650.org

21-02-07, 10:39 AM

A large truck is crossing a bridge 1 mile long. The bridge can only hold 14000 lbs, which is the exact weight of the truck. The truck makes it half way across the bridge and stops. A bird lands on the truck. Does the bridge collapse? Give a reason.

OK, I'll stop after this one

21-02-07, 10:45 AM

Will the bird take off when it senses the bridge going kaput?

21-02-07, 10:56 AM

Quote:

Originally Posted by Baph

A large truck is crossing a bridge 1 mile long. The bridge can only hold 14000 lbs, which is the exact weight of the truck. The truck makes it half way across the bridge and stops. A bird lands on the truck. Does the bridge collapse? Give a reason.

OK, I'll stop after this one

No, the H&S people would of put signs saying it can only hold 14000lbs. When infact it can hold 24000lbs.

Stingo · 21-02-07, 11:21 AM

yes it will collapse - because...

14000lbs + weight of bird is greater than supposed breaking strain. It's a bit like have a lorry that weighs 14000lbs and then filling up its trailer with 'stuff' - the two combined become the total overall weight. I reckon. Does it have a plimsol line?!?!

21-02-07, 11:23 AM

No one has mentioned either that the truck weights 14000lbs nothing about the driver or its load.

Dan

21-02-07, 11:45 AM

Quote:

Originally Posted by Stingo

yes it will collapse - because...

14000lbs + weight of bird is greater than supposed breaking strain. It's a bit like have a lorry that weighs 14000lbs and then filling up its trailer with 'stuff' - the two combined become the total overall weight. I reckon. Does it have a plimsol line?!?!

Nice thinking, but wrong.

Quote:

Originally Posted by Sudoxe

No one has mentioned either that the truck weights 14000lbs nothing about the driver or its load.

Dan

It's assumed that the entire truck, including the driver etc weighs 14000lbs. Now get on with the answer (and reason)

21-02-07, 11:46 AM

Quote:

Originally Posted by Filipe M.

Will the bird take off when it senses the bridge going kaput?

Wouldn't that cause a slight downdraft on the truck as the bird took off?

21-02-07, 11:47 AM

Quote:

Originally Posted by Baph

Wouldn't that cause a slight downdraft on the truck as the bird took off?

It depends if said bird is VTOL, HTOL, and the length of the treadmill. Oh, and friction!

21-02-07, 11:50 AM

Depends on the weight of the bird & the amount of fuel consumed to get the lorry half way across.

I would guess that normal lorry & sparrow/pidgeon (not a vulture with a horses carcass in its mouth!!!) then:

It won't collapse!

21-02-07, 11:52 AM

Is 14000lbs the ultimate weight the bridge can hold, or the safe weight it can hold?

If it's the ultimate weight then chances are the resulting displacement from the dymanics imposed by the truck driving onto the bridge would've outshone the dicky-bird taking a pew.

How big is the bird? Is it possible, the said beasty could've flown off with the truck?

21-02-07, 10:39 AM	#1
Baph Guest Posts: n/a	And another... A large truck is crossing a bridge 1 mile long. The bridge can only hold 14000 lbs, which is the exact weight of the truck. The truck makes it half way across the bridge and stops. A bird lands on the truck. Does the bridge collapse? Give a reason. OK, I'll stop after this one

21-02-07, 10:45 AM	#2
Filipe M. Guest Posts: n/a	Re: And another... Will the bird take off when it senses the bridge going kaput?

21-02-07, 11:21 AM	#4
Stingo Member Join Date: Feb 2006 Location: Plymouth, Devon - mostly. Posts: 527	Re: And another... yes it will collapse - because... 14000lbs + weight of bird is greater than supposed breaking strain. It's a bit like have a lorry that weighs 14000lbs and then filling up its trailer with 'stuff' - the two combined become the total overall weight. I reckon. Does it have a plimsol line?!?! __________________ Twitter: @poseidon_ashore

21-02-07, 11:23 AM	#5
Sudoxe Guest Posts: n/a	Re: And another... No one has mentioned either that the truck weights 14000lbs nothing about the driver or its load. Dan

21-02-07, 11:50 AM	#9
Kinvig Guest Posts: n/a	Re: And another... Depends on the weight of the bird & the amount of fuel consumed to get the lorry half way across. I would guess that normal lorry & sparrow/pidgeon (not a vulture with a horses carcass in its mouth!!!) then: It won't collapse!

21-02-07, 11:52 AM	#10
Nutkins Guest Posts: n/a	Re: And another... Is 14000lbs the ultimate weight the bridge can hold, or the safe weight it can hold? If it's the ultimate weight then chances are the resulting displacement from the dymanics imposed by the truck driving onto the bridge would've outshone the dicky-bird taking a pew. How big is the bird? Is it possible, the said beasty could've flown off with the truck?