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Things you've always wanted to know an answer to...

Who's the Big Daddy behind the SZ/Curry Club Clique...

I've imagined it's all a bit Sicilian Crime Family-esque Cloak and Dagger style secrecy. The one person you think is the Don, is probably just the tea boy.
 
I always wanted to know if it was possible to drive to the erupting volcano in Battlezone.
 
Does anyone know why the massive cruise liners dont sink?

For me the basic of making something out or Iron that floats just seems unreal. I am guessing its to do with air pressure in the hold but can anyone give me any extra info?
 
Does anyone know why the massive cruise liners dont sink?

For me the basic of making something out or Iron that floats just seems unreal. I am guessing its to do with air pressure in the hold but can anyone give me any extra info?

very simply, if something is less dense than the substance it is in, then it will rise to the surface... because the upward buoyancy force overcomes gravity.

whilst a cruise liner is very heavy, it has a lower density (i.e a cruise liner is lighter than a massive chunk of water the same size as a cruise liner), because it contains air, and therefore it floats.
 
Does anyone know why the massive cruise liners dont sink?

For me the basic of making something out or Iron that floats just seems unreal. I am guessing its to do with air pressure in the hold but can anyone give me any extra info?

Boats are designed so that they are mostly air (the bit in the middle where the bars and fruit machines on cross channel ferries are located).

The average density of a boat (hull,bulkheads,fruit machines etc.) is much less than the density of water therefore they float.

If the hull is breached then the boat fills with water. It's average density becomes greater than that of water therefore it sinks.
 
Now to really make a physicist head explod ask them to describe the difference between weight and density (and before anyone gets smart and says nnaah , that will show your not a working physicist but have been taught it in science lessons ;) )
 
Now to really make a physicist head explod ask them to describe the difference between weight and density (and before anyone gets smart and says nnaah , that will show your not a working physicist but have been taught it in science lessons ;) )

quite simply, density is mass(or weight) per unit of volume. a 1cm cube of metal is heavier, and hence more dense than a 1cm cube of wood.

Pubey BA MSc A-level Physics
 
quite simply, density is mass(or weight) per unit of volume. a 1cm cube of metal is heavier, and hence more dense than a 1cm cube of wood.

Pubey BA MSc A-level Physics

Mass and weight are different. Mass is measured in Kilograms, weight is measured in Newtons.

The mass of an object is constant -the weight of an object is the force exerted on the object by gravity.

A 1cm cube of wood would weigh more on Jupiter than a 1cm cube of lead would weigh on Earth.

Served by Mad Cyril - B.Sc(Hons) Physics.
 
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Mass and weight are different. Mass is measured in Kilograms, weight is measured in Newtons.

The mass of an object is constant -the weight of an object is the force exerted on the object by gravity.

A 1cm cube of wood would weigh more on Jupiter than a 1cm cube of lead would weigh on Earth.

Served by Mad Cyril - B.Sc(Hons) Physics.

indeed, I was trying to keep it simple!
 
You both have the definitions down pat. Cyril your being awfully kind ;), next you'll be telling people what Gravity is ;)

Doh my weird brain i meant to say mass and density not weight he he whoops ;)
 
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Come on then clever people, why when I've just had my gallbladder removed am I getting pain in my right shoulder?
 
Heres another.

If I am standing inside a train and I jump up in the air when I land I in the same spot on the floor.

However if I am on the roof of the train and jump up when I land I am in a different spot on the roof. ( I think)

Is this solely down to wind forces etc or not?
 

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